阅读说明：本技术 光电混合器件 (Photoelectric hybrid device ) 是由 陈国平 刘晓远 邱炳龙 于 2019-11-08 设计创作，主要内容包括：本发明提供一种光电混合器件,包括光学光纤阵列,光学光纤阵列的出射端设置有透镜阵列,其中,透镜阵列远离光学光纤阵列的一侧设置有合光分光晶体,合光分光晶体在远离光学光纤阵列的一侧设置有波片组件,波片组件远离合光分光晶体的一侧依次设置有第一法拉第旋光片、沃拉斯顿组件以及第二法拉第旋光片,第二法拉第旋光片远离沃拉斯顿组件的一侧设置有滤波片,滤波片靠近第二法拉第旋光片的表面上设置有透射反射膜,滤波片远离第二法拉第旋光片的一侧设置有光电探测器组件。本发明可以降低光电混合器件的生产工艺难度,并且降低光电混合器件的生产成本。(The invention provides a photoelectric hybrid device, which comprises an optical fiber array, wherein a lens array is arranged at the emergent end of the optical fiber array, a light combining and splitting crystal is arranged at one side of the lens array, which is far away from the optical fiber array, a wave plate component is arranged at one side of the light combining and splitting crystal, a first Faraday optical rotation sheet, a Volaston component and a second Faraday optical rotation sheet are sequentially arranged at one side of the wave plate component, which is far away from the light combining and splitting crystal, a filter sheet is arranged at one side of the second Faraday optical rotation sheet, which is far away from the Volaston component, a transmission and reflection film is arranged on the surface of the filter sheet, which is close to the second Faraday optical rotation sheet, and a photoelectric detector component is arranged at one side of the filter sheet, which is far away. The invention can reduce the difficulty of the production process of the photoelectric hybrid device and reduce the production cost of the photoelectric hybrid device.)

1. An opto-electric hybrid device comprising:

an optical fiber array;

the method is characterized in that:

the emergent end of optics fiber array is provided with the lens array, the lens array is kept away from one side of optics fiber array is provided with the beam splitting crystal that combines, it is keeping away from to combine the beam splitting crystal one side of optics fiber array is provided with the wave plate subassembly, the wave plate subassembly is kept away from one side of beam splitting crystal has set gradually first Faraday optical rotation piece, Wollaston subassembly and second Faraday optical rotation piece, second Faraday optical rotation piece is kept away from one side of Wollaston subassembly is provided with the filter, the filter is close to the second Faraday optical rotation piece be provided with the transmission reflectance coating on the surface, the filter is kept away from one side of second Faraday optical rotation piece is provided with the photoelectric detector subassembly.

2. The optoelectronic hybrid device as recited in claim 1, wherein:

the Wollaston component comprises two prisms which are adjacent to each other, and the optical axes of the two prisms are vertical to each other.

3. Optoelectronic hybrid device according to claim 1 or 2, characterized in that:

the wave plate component comprises a glass plate and a half-wave plate, and the glass plate and the half-wave plate are attached to the end face of the light combining and splitting crystal.

4. The optoelectronic hybrid device as recited in claim 3, wherein:

the glass plate is arranged on a first light path of the light combining and splitting crystal, and the half-wave plate is positioned on a second light path of the light combining and splitting crystal.

5. Optoelectronic hybrid device according to claim 1 or 2, characterized in that:

the wave plate component comprises two half-wave plates which are attached to the end face of the light combining and splitting crystal.

6. The optoelectronic hybrid device as recited in claim 5, wherein:

the two half-wave plates are respectively positioned on two light paths of the light combining and splitting crystal.

7. Optoelectronic hybrid device according to claim 1 or 2, characterized in that:

the photoelectric detector assembly comprises a photoelectric detector with more than two detection ports, and the detection ports are opposite to the filter.

8. Optoelectronic hybrid device according to claim 1 or 2, characterized in that:

the photoelectric detector assembly comprises a plurality of photoelectric detectors which are arranged in parallel, each photoelectric detector is provided with a detection port, and the detection ports are opposite to the filters.

9. Optoelectronic hybrid device according to claim 1 or 2, characterized in that:

the optical fiber array has three or more ports, and the ports are arranged in parallel with each other.

10. The optoelectronic hybrid device as recited in claim 9, wherein:

the lens array comprises lenses which are arranged in parallel, the number of the lenses is equal to that of the ports, and the lenses are arranged in one-to-one correspondence with the ports.

Technical Field

The invention relates to the technical field of optical devices, in particular to a photoelectric hybrid device.

Background

A circulator is a common optical device, and generally, a circulator has a plurality of ports, a light beam can only exit from an adjacent next port after entering from one port, and an optical path is fixed and irreversible, and is often used for controlling a light beam propagation circuit. Common circulators include three-port circulators, four-port circulators, and the like. In order to monitor the amount of light energy in the light beam passing through the circulator, some prior circulators are provided with a photodetector for detecting the amount of light energy passing through the circulator.

US6310989 discloses a three-port reflective circulator with an array fiber (FiberArray) having a plurality of ports, the ports can be used as the incident end or the emergent end of light, a lens is disposed on one side of the array fiber, the light beam emerging from the first port passes through the lens to form three collimated light beams, and the three collimated light beams are distributed in a symmetrical angle. Three collimated lights become three parallel collimated lights after roof prism, and every beam of light is separated into two bundles of ordinary lights and extraordinary rays with mutually perpendicular polarization directions through a first displacement crystal, wherein one beam of light is after the wave plate, and the polarization direction of the beam of light is rotated by 90 degrees, and the polarization directions of the two bundles of light are consistent. Then, after passing through the Faraday rotator after passing through the second displacement crystal, the two beams of light rotate in the polarization direction by 45 degrees, and after passing through the reflector, the two beams of light pass through the Faraday rotator again, the polarization direction of the light beam rotates by 45 degrees again, and at the moment, the polarization direction of the light beam is deflected by 90 degrees relative to the original time. And then, the light beam can be displaced after passing through the second displacement crystal again, at the moment, the light beam is upwards translated and finally converged to the second port after passing through the displacement crystal and the roof prism again, and the light emitted from the second port is similar to the situation of the first port and is finally converged to the third port and emitted.

The existing circulator has the following disadvantages: firstly, the circulator uses a displacement crystal and generates beam deflection to enable a beam reflected from a reflector after the beam is emitted from a first port to be translated to a second port, namely the translation of the beam is realized by a second displacement crystal, so that the distance between the reflected beams must be very accurate to match the distance between the cores of the array fibers because the core distance of the optical fibers of the array fibers is very accurate, and the distance between the reflected beams is controlled by the thickness of the displacement crystal, so that the tolerance requirement on the thickness processing of the displacement crystal is very high, the production cost of the circulator is increased, and the production process requirement of the circulator is very high.

Secondly, the existing circulator needs to use a roof prism, the angle precision of the roof prism for processing is very high so as to meet the use requirement, the material cost for producing the circulator is also increased, and the production cost of the circulator is very high.

Disclosure of Invention

The invention mainly aims to provide a photoelectric hybrid device which is low in production cost and simple in production process.

In order to achieve the main purpose of the present invention, the optoelectronic hybrid device provided by the present invention includes an optical fiber array, a lens array is disposed at an exit end of the optical fiber array, wherein a light combining and splitting crystal is disposed at a side of the lens array away from the optical fiber array, a wave plate assembly is disposed at a side of the light combining and splitting crystal away from the optical fiber array, a first faraday optical rotation plate, a wollaston assembly and a second faraday optical rotation plate are sequentially disposed at a side of the wave plate assembly away from the light combining and splitting crystal, a filter plate is disposed at a side of the second faraday optical rotation plate away from the wollaston assembly, a transmission and reflection film is disposed on a surface of the filter plate close to the second faraday optical rotation plate, and a photodetector assembly is disposed at a side of the filter plate away from the second faraday optical rotation.

According to the scheme, the light beam deflects in the transmission direction through the Wollaston component, so that the photoelectric hybrid device is only provided with the light-combining light-splitting crystal which can be a displacement crystal, and compared with the existing photoelectric hybrid device, the use of one displacement crystal is reduced. And because the Wollaston component is used for replacing a second displacement crystal in front of a reflector in the existing circulator and the collimation of the light beam is realized by using the lens array, the light beam emitted from the lens array is collimated light, and the light beam does not need to be collimated by a roof prism, so that the processing difficulty of the photoelectric hybrid device is obviously reduced, and the production cost of the photoelectric hybrid device is further reduced.

Because the photoelectric hybrid is provided with filter and photoelectric detector, the light beam after the second Faraday optical rotation piece incides the filter, and partly light beam will pass the filter and be received by photoelectric detector for survey light energy, and another part light beam will be reflected to second Faraday optical rotation piece to through Wollaston subassembly, first Faraday optical rotation piece and the emergence of beam combining splitting crystal etc. from another port, realize the function of circulator.

In a preferred embodiment, the wollaston module comprises two prisms adjacent to each other, the optical axes of the two prisms being perpendicular to each other.

Therefore, the Wollaston component is formed by the prisms with the optical axes perpendicular to each other, and the propagation direction of the light beam is deflected when the light beam passes through the Wollaston component, so that the displacement of the light beam is realized. Therefore, the Wollaston prism is used for replacing the displacement crystal of the existing circulator, and the problem that the circulator needs to be realized by the displacement crystal with high processing difficulty is solved.

The wave plate component comprises a glass plate and a half-wave plate, and the glass plate and the half-wave plate are attached to the end face of the light combining and splitting crystal.

Therefore, the polarization direction of the light beam cannot be changed when the light beam passes through the glass plate, the polarization direction of the light beam is deflected after the light beam passes through the half-wave plate, and the polarization direction of a part of the light beam can be changed by using the assembly of the glass plate and the half-wave plate.

In a further scheme, the glass plate is arranged on a first light path of the light combining and splitting crystal, and the half-wave plate is arranged on a second light path of the light combining and splitting crystal.

Therefore, for one path of light beam needing to change the polarization direction, the half-wave plate can be arranged on the light path, and for the other path of light beam needing not to change the polarization direction, the glass plate can be arranged, so that the requirement of adjusting the polarization direction of the light beam is met.

One optional scheme is that the wave plate assembly comprises two half-wave plates, the two half-wave plates are attached to the end face of the light combining and splitting crystal, and the two half-wave plates are respectively located on two light paths of the light combining and splitting crystal.

Therefore, if the polarization directions of the two light beams need to be rotated and the rotation directions are different, the half-wave plates with different deflection angles can be respectively arranged on the light paths of the two light beams, so that the rotation requirement of the polarization directions of the light beams is met.

Preferably, the photodetector assembly includes a photodetector having two or more detection ports, and the plurality of detection ports face the filter.

Therefore, the photoelectric detector is provided with more than two detection ports, can detect the light energy of two paths of light beams simultaneously, and can reduce the volume of the photoelectric hybrid device.

Preferably, the photodetector assembly includes a plurality of photodetectors arranged in parallel, each photodetector has a detection port, and the detection port faces the filter.

Therefore, each photoelectric detector can independently receive one light beam, and the detection of the light energy of the light beam is more accurate.

Further, the optical fiber array has three or more ports, and the ports are arranged in parallel.

The optical fiber array is provided with more than three ports, and the requirements of using a plurality of ports of the photoelectric hybrid device can be met.

The lens array comprises a plurality of lenses which are arranged in parallel, the number of the lenses is equal to that of the ports, and the lenses are arranged in a one-to-one correspondence with the ports.

Because each port corresponds to one lens, the light beams emitted from each port are collimated by the lens, so that the light beams emitted from the lens are collimated light beams, and the size of the photoelectric hybrid device is reduced.

Further, each lens is a silicon lens. The silicon lens has higher refractive index, and the formed light spot is smaller, so that the volume of a later-stage optical device is smaller, and the miniaturization of the photoelectric hybrid device is facilitated.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of another view angle of the first embodiment of the present invention.

Fig. 3 is a schematic light path diagram in a top view direction according to the first embodiment of the present invention.

FIG. 4 is a schematic side view of the optical path of the first embodiment of the present invention.

Fig. 5 is a schematic illustration of the polarization direction of a light beam passing through various devices of the first embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a second embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a third embodiment of the present invention.

The invention is further explained with reference to the drawings and the embodiments.

Detailed Description

The first embodiment:

the optoelectronic hybrid device of the present embodiment is a hybrid device composed of a three-port circulator and a photodetector, and referring to fig. 1 and fig. 2, the optoelectronic hybrid device has an optical fiber array 10, a plurality of optical fibers are disposed in the optical fiber array 10, and the optical fiber array 10 has three ports, from which light beams can enter the optoelectronic hybrid device or exit the optoelectronic hybrid device. A lens array 14 is arranged on one side of the optical fiber array 10, in the embodiment, the lens array 14 is provided with three silicon lenses 15, 16, 17, and preferably, the axes of the three silicon lenses 15, 16, 17 are parallel to each other. Furthermore, each silicon lens 15, 16, 17 corresponds to one port of the optical fiber array 10, i.e. three ports of the optical fiber array 10 are disposed in one-to-one correspondence with the three silicon lenses 15, 16, 17. Thus, the light beam exiting from one port passes through a silicon lens and becomes collimated light.

A displacement crystal 20 as a light combining and splitting crystal is disposed on the side of the lens array 14 away from the optical fiber array 10, and the light beam is split into two linearly polarized lights with polarization directions perpendicular to each other after entering the displacement crystal 20. The side of the displacement crystal 20 far away from the lens array 14 is provided with a wave plate assembly 24, in this embodiment, the wave plate assembly 24 includes a glass plate 25 and a half-wave plate, and the glass plate 25 and the half-wave plate 26 are both attached to the end face of the displacement crystal 20 and are respectively located on two different light paths. Preferably, the half-wave plate 26 is a 45 ° half-wave plate, and the polarization direction of the light beam is rotated after the linearly polarized light passes through the half-wave plate, for example, the polarization direction is rotated by 90 °. Since the polarization direction of the light passing through the glass plate is not rotated, the two linearly polarized lights emitted from the displacement crystal 20 after passing through the wave plate assembly 24 have the same deflection direction.

A first Faraday rotation sheet 28, a Wollaston assembly 30 and a second Faraday rotation sheet 35 are sequentially arranged on one side of the wave plate assembly, which is far away from the displacement crystal 20, wherein the Wollaston assembly 30 consists of two prisms 31 and 32 with mutually vertical optical axes. In this embodiment, the first faraday rotation plate 28, the prism 31, the prism 32, and the second faraday rotation plate 35 are adjacent to each other in this order, and the light beam emitted from the wave plate assembly 24 passes through the first faraday rotation plate 28, the prism 31, the prism 32, and the second faraday rotation plate 35 in this order. Of course, a magnetic field generator is provided radially outside the first faraday rotator 38 and the second faraday rotator 35.

After the light beam passes through the first faraday rotator 28, the polarization direction of the light beam is rotated by 45 °, and after the light beam passes through the wollaston assembly 30, the propagation direction of the light beam is deflected, for example, in the direction of fig. 1, assuming that the light beam is incident on the prism 31 from a direction perpendicular to the surface of the prism 31, and after the light beam is incident on the prism 32 from the prism 31, the light beam is deflected downward by a certain angle, so that the propagation direction of the light beam is not perpendicular to the incident surface of the prism 31. When the light beam exits the prism 32, the propagation direction of the light beam is already deflected and enters the second faraday rotator, the propagation direction of the light beam is already deflected at a smaller angle than when the light beam enters the prism 31. When the light beams are incident on the second faraday rotator 35, the polarization directions of the two light beams are rotated again, but the propagation directions of the light beams are not changed.

The filter 40 is arranged on the side of the second faraday rotation plate 35 far away from the wollaston component 30, and the surface of the filter 40 close to the second faraday rotation plate 35 is coated with a transmission reflection film, so that a small part of light beams incident to the filter 40 will pass through the filter 40, and most of the light beams will be reflected back, for example, only 1% of the light beams pass through the filter 40, and 99% of the light beams are reflected, thus the light energy loss of the reflected light beams can be reduced as much as possible. A photodetector assembly 41 is provided on the side of the filter 40 remote from the second faraday rotation plate 35, and in the present embodiment, the photodetector assembly 41 includes a plurality of photodetectors 42, 43, and the plurality of photodetectors 42, 43 are provided in parallel with each other. The light beams passing through the filter 40 will be incident on the photodetectors 42, 43, thereby monitoring the light energy of each beam.

The incident surface of the filter 40 is parallel to the incident surface of the prism 31, and since the light beam is deflected in the propagation direction after passing through the wollaston assembly 30, the light beam is not incident perpendicularly to the surface of the filter 40, but is incident at a certain angle to the filter 40, as shown in fig. 1. Thus, the light beam reflected by the filter 40 does not return to the second faraday rotator 35 according to the originally incident light path, and a certain distance is formed between the reflected light path and the originally incident light path, and at this time, the reflected light beam actually shifts with respect to the incident light beam, for example, shifts to the light path corresponding to the light beam emitted from the second port.

The reflected light beam enters the second faraday rotator 35 first and the polarization direction of the light beam is rotated again, that is, the polarization direction of the light beam is rotated by 45 °, and at this time, the polarization direction of the light beam is rotated by 90 ° when the light beam enters the second faraday rotator 35 for the first time. When the beam passes again through the Wollaston assembly 30, the direction of propagation will be deflected, i.e., parallel to the direction in which the beam was first incident on the Wollaston assembly 30, but in the opposite direction, i.e., toward the displacement crystal 20.

Thereafter, the light beam enters the first faraday rotator 28 again, the polarization direction of the light beam rotates again, and the polarization direction of the light beam returns to the state when the light beam first passes through the first faraday rotator 28, that is, the polarization directions of the two light beams are parallel to each other. Then, the light beams will be incident on the wave plate assembly 24 again, the polarization direction of one light beam is rotated, the polarization direction of the other light beam is not rotated, the polarization directions of the two light beams are perpendicular to each other, when the light beams pass through the displacement crystal 20 again, the two light beams with the perpendicular polarization directions will be combined into one light beam, and finally the light beam is incident on the silicon lens 16 and exits from the second port of the optical fiber array 10.

The following describes the propagation path and the polarization direction change of the light beam in the optical hybrid device with reference to fig. 3 to 5. As shown in fig. 3, the light beam emitted from the first port passes through the silicon lens 15 to form collimated light L10, and the collimated light L10 may include two light components having polarization directions perpendicular to each other, the polarization directions of which are shown in fig. 5 (a). In fig. 5, the 6 blocks of each group are arranged in two rows and three columns, the upper and lower rows respectively indicate the polarization directions of two light beams separated after exiting from one silicon lens, and the three columns respectively indicate the polarization directions of light beams on the optical paths corresponding to the three silicon lenses from right to left.

After entering the displacement crystal 20, two light beams L11 and L21 with mutually perpendicular polarization directions are formed, one of which is ordinary light and the other is extraordinary light, and the polarization directions of the two light beams are shown in fig. 5 (b). As can be seen from fig. 3, in a top view, the light beam L10 is incident on the displacement crystal 20 and is split into two light beams L11 and L12, and the optical paths of the two light beams L11 and L12 are separated. Referring to fig. 4, the propagation directions of the two beams L11, L12 within the displacement crystal 20 are the same in the side view direction, and therefore the optical paths of the two beams L11, L12 are separated only in the top view direction.

The light beams L11, L21 will pass through the wave plate assembly 24, for example, the light beam L11 passes through the glass plate 25 in the wave plate assembly 24 to form the light beam L12, the polarization direction will not change, while the light beam L21 passes through the half-wave plate 26 in the wave plate assembly 24 to form the light beam L22, and the polarization direction is deflected by 90 °, as shown in fig. 5 (c). At this time, the polarization direction of the light beam L12 is the same as that of the light beam L22.

Subsequently, the light beams L12, L22 are incident on the first faraday rotator 28 to form light beams L13, L23, respectively, and the polarization directions of the light beams L13, L23 are rotated by 45 ° compared with the polarization directions of the light beams L12, L22, as shown in fig. 5 (d). At this time, the polarization directions of the light beam L13 and the light beam L23 are also the same.

Then, the light beams L13 and L23 are incident on the wollaston assembly 30 to form light beams L14 and L24, respectively, since the wollaston assembly 30 does not change the polarization direction of the light beams, but only the propagation direction of the light beams is changed, after passing through the wollaston assembly 30, the propagation directions of the light beams L14 and L24 approach the direction of the second port, and therefore, the light beams are not perpendicularly incident on the filter 40, as shown in fig. 4. The polarization directions of the light beams L14 and L24 are shown in fig. 5(e), and the light beams L14 and L24 approach the silicon lens 16.

The light beams L14 and L24 pass through the wollaston module 30 and enter the second faraday rotation plate 35 to form light beams L15 and L25, and since the second faraday rotation plate 35 rotates the polarization direction of the light beams, the polarization directions of the light beams L15 and L25 are rotated by 45 ° with respect to the polarization directions of the light beams L14 and L24, and as shown in fig. 5(f), the polarization directions of the light beams L15 and L25 are parallel to each other.

The light beams emitted from the second faraday rotation plate 35 form light beams L16, L26 and enter the filter 40, and since the light beams L16, L26 are not vertically incident, the reflected light beams do not return along the optical path of the incident light beams. As shown in fig. 4, taking the light beam L16 as an example, the light beam L16 is incident on the filter 40, a part of the light beam forms a reflected light beam L31, the traveling direction of the light beam L31 is deflected to the direction of the silicon lens 16, and the light beam L31 is incident on the second faraday rotation plate 35 to form a light beam L32. Due to the rotation of the polarization direction of the light beam by the second faraday rotator 35, the polarization direction of the light beam L32 is rotated by 45 °, as shown in fig. 5 (g). Similarly, after the light beam L26 passes through the filter 40, a part of the light beam is reflected to form a reflected light beam L41, and the polarization direction of the light beam L41 does not change, except that the propagation direction of the light beam L41 is different from the direction of the light beam L26. When the light beam L41 enters the second faraday rotator 35, the polarization direction of the formed light beam L42 is also rotated by 45 °. At this time, the polarization direction of the light beam L42 is rotated by 90 ° from the polarization direction of the light beam L25. In addition, a portion of the light beam L17 passing through the filter 40 will pass through the filter 40 and be incident on the photodetector 42, so that the photodetector 42 can detect the light energy of this light beam. Similarly, when the light beam L25 is incident on the filter 40, a part of the light beam passes through the filter 40 and is incident on the photodetector 42.

Then, the light beams L32 and L42 are incident on the wollaston assembly 30 to form light beams L33 and L43, and the propagation directions of the light beams are deflected again, i.e., the propagation directions of the light beams L33 and L43 are parallel to the light beams L14 and L24, but the propagation directions are opposite, i.e., the light beams propagate toward the displacement crystal 20, and the polarization directions of the light beams L33 and L43 are shown in fig. 5 (h).

Thereafter, the light beams L33, L43 enter the first faraday rotator 28 to form light beams L34, L44, and the polarization directions of the light beams L34, L44 are rotated by 45 ° again, as shown in fig. 5 (i). It can be seen that the polarization directions of the light beams L34 and L44 are the same as the polarization directions of the light beams L13 and L23, that is, the polarization directions of the light beams are restored to the state when the light beams pass through the first faraday rotator 28, and the polarization directions of the two light beams L34 and L44 are parallel to each other.

Then, the light beams L34 and L44 will be incident on the wave plate assembly 24 again to form light beams L35 and L45, respectively, wherein the light beam L35 passes through the half-wave plate 26, the polarization direction thereof will be rotated by 90 °, and the light beam L45 passes through the glass plate, the polarization direction thereof will not be deflected, at this time, the polarization directions of the light beams L35 and L45 are as shown in fig. 5(j), and the polarization directions of the light beams L35 and L45 are perpendicular to each other. When the light beams L35 and L45 pass through the displacement crystal 20 again, light beams L36 and L46 are formed, two light beams L36 and L46 with mutually perpendicular polarization directions are combined to form a light beam L37, the polarization direction of which is shown in fig. 5(k), and finally the light beam L37 enters the silicon lens 16 and exits from the second port of the optical fiber array 10.

As can be seen, the light beam L10 enters from the first port of the optical fiber array, and then exits from the second port after a series of changes such as splitting, polarization rotation, reflection, and combination. Similarly, a light beam incident from the second port will undergo the same change as the light beam L10 and will exit from the third port. Further, since the beam can be deflected only in one direction when it passes through the wollaston cell 30, the optical path is irreversible, i.e., the beam incident from the second port cannot exit from the first port but can exit from the third port, thereby ensuring unidirectionality of the optical path.

In the above embodiment, the wave plate assembly is composed of a glass plate and a half-wave plate, and in practical application, the wave plate assembly may also be composed of two half-wave plates, and if two half-wave plates are used, the two half-wave plates are respectively attached to the end surfaces of the displacement crystal, and each half-wave plate is respectively located on one light path. Because the light beam forms a beam of ordinary light and a beam of extraordinary light when passing through the displacement crystal, the two half-wave plates are respectively positioned on the light paths of the ordinary light and the extraordinary light. Of course, when the light beams pass through the two half-wave plates, the rotation angles of the polarization directions are different, for example, one light beam is rotated by 45 degrees clockwise, and the other light beam is rotated by 45 degrees counterclockwise, so as to ensure that the polarization directions of the two light beams after passing through the wave plate assembly are the same.

Since the wollaston assembly 30 is used in the embodiment to realize the deflection of the optical path, that is, the optical path is translated by a distance of one lens, the optical path is not required to be translated by a displacement crystal, so that a displacement crystal with a very strict thickness requirement is not required to be arranged, the processing difficulty of the optical band mixing device can be reduced, and the production cost of the optical band mixing device can also be reduced. In addition, the invention does not need to arrange a roof prism with high angle precision for processing, and can further reduce the production cost of the optical band hybrid device.

In addition, the lens array of the invention uses three silicon lenses which are parallel to each other, and because the refractive index of the silicon lenses is very high, the area of the formed light spot is small, so that the displacement crystal at the later stage can be realized by using a crystal with a small volume, and the volume of the light band mixing device is more favorably reduced.

Second embodiment:

referring to fig. 6, the present embodiment has an optical fiber array 50, a plurality of optical fibers are disposed in the optical fiber array 50, and the optical fiber array 50 has three ports from which light beams can be incident into the optical band mixing device or exit from the optical band mixing device. A lens array 54 is provided at one side of the optical fiber array 50, and in the present embodiment, the lens array 54 is provided with three silicon lenses 55, 56, 57. And, each of the silicon lenses 55, 56, 57 corresponds to one port of the optical fiber array 50.

A displacement crystal 60 as a light combining and splitting crystal is provided on the side of the lens array 54 away from the optical fiber array 50, and a light beam is incident on the displacement crystal 60 and then split into two linearly polarized lights having polarization directions perpendicular to each other. A wave plate assembly 64 is disposed on a side of the displacement crystal 60 remote from the lens array 54.

A first faraday optical rotation plate 68, a wollaston assembly 70 and a second faraday optical rotation plate 75 are arranged in this order on the side of the wave plate assembly 64 remote from the displacement crystal 50, wherein the wollaston assembly 70 is composed of two prisms 71, 72 with mutually perpendicular optical axes. The first faraday rotation plate 68, the prism 71, the prism 72, and the second faraday rotation plate 75 are adjacent to each other in this order, and the light beam emitted from the wave plate assembly 64 passes through the first faraday rotation plate 68, the prism 71, the prism 72, and the second faraday rotation plate 75 in this order.

A filter 76 is provided on the second faraday rotation plate 75 on the side away from the wollaston assembly 70, and a transmissive reflective film is coated on the surface of the filter 76 close to the second faraday rotation plate 75, so that a part of the light beam incident on the filter 76 passes through the filter 76 and another part of the light beam is reflected back. A photoelectric detector assembly 78 is arranged on one side of the filter 76 far away from the second faraday rotation sheet 75, the photoelectric detector assembly 78 comprises three photoelectric detectors 79 which are axially parallel to each other, and each photoelectric detector 79 is over against the light path corresponding to one lens 55, 56 and 57, so that the three photoelectric detectors can respectively detect the light energy of the light beams on the three light paths.

The third embodiment:

referring to fig. 7, the present embodiment has an optical fiber array 80, a plurality of optical fibers are disposed in the optical fiber array 80, and the optical fiber array 80 has three ports from which light beams can be incident into the optical band mixing device or exit from the optical band mixing device. A lens array 81 is provided at one side of the optical fiber array 80, and in the present embodiment, the lens array 81 is provided with three silicon lenses. And, each silicon lens corresponds to a port of the optical fiber array 80.

A displacement crystal 82 as a light combining and splitting crystal is provided on the side of the lens array 81 away from the optical fiber array 80, and the light beam is split into two linearly polarized lights having polarization directions perpendicular to each other after entering the displacement crystal 82. A wave plate assembly 83 is provided on the side of the displacement crystal 82 remote from the lens array 81.

A first faraday optical rotation plate 84, a wollaston assembly 85 and a second faraday optical rotation plate 88 are sequentially arranged on the side of the wave plate assembly 83 far away from the displacement crystal 82, wherein the wollaston assembly 85 is composed of two prisms 86 and 87 with mutually perpendicular optical axes. The first faraday rotation plate 84, the prism 86, the prism 87, and the second faraday rotation plate 88 are adjacent to each other in this order, and the light beam emitted from the wave plate module 83 passes through the first faraday rotation plate 84, the prism 86, the prism 87, and the second faraday rotation plate 88 in this order.

A filter 90 is disposed on a side of the second faraday optical rotation plate 88 away from the wollaston assembly 85, and a transmissive reflective film is coated on a surface of the filter 90 close to the second faraday optical rotation plate 88, so that a part of the light beam incident on the filter 90 passes through the filter 90 and another part of the light beam is reflected back. A photodetector assembly 91 is disposed on a side of the filter 90 away from the second faraday rotation plate 88, which is different from the second embodiment in that the photodetector 91 of this embodiment has three detection ports, and each detection port is opposite to a light path corresponding to one lens. In this way, the volume of the photodetector assembly 91 can be reduced, thereby reducing the volume of the optoelectric hybrid device.

Finally, it should be emphasized that the present invention is not limited to the above-described embodiments, for example, the common lens is used in the lens array of the optoelectronic hybrid device instead of the silicon lens, or the optoelectronic hybrid device is provided with more than four ports, and such variations should also be included in the protection scope of the claims of the present invention.