阅读说明：本技术 一种光旁路系统 (Light bypass system ) 是由 莫树钿 刘紫璐 何风岐 梁永祥 黄志斌 于 2019-12-20 设计创作，主要内容包括：本发明提供了一种光旁路系统,其包括：接收第一光纤通信设备发送的光信号并进行分光处理后发送到第二分光器的第一分光器；接收所述第一分光器分光处理后发送的光信号并发送到第二光纤通信设备的第二分光器；所述第一分光器连接所述第二分光器,所述第一分光器连接中间光纤通信设备的第一端口,所述第二分光器连接所述中间光纤通信设备的第二端口,所述第一分光器连接所述第一光纤通信设备,所述第二分光器连接所述第二光纤通信设备；所述光旁路系统还包括光开关器件,当本地站点掉电时,将倒换从本地上游节点传来的光信号直接传输。(The present invention provides an optical bypass system, comprising: the first optical splitter receives an optical signal sent by the first optical fiber communication equipment, performs optical splitting processing on the optical signal and sends the optical signal to the second optical splitter; receiving the optical signal sent after the optical splitting processing of the first optical splitter and sending the optical signal to a second optical fiber communication device; the first optical splitter is connected with the second optical splitter, the first optical splitter is connected with a first port of intermediate optical fiber communication equipment, the second optical splitter is connected with a second port of the intermediate optical fiber communication equipment, the first optical splitter is connected with the first optical fiber communication equipment, and the second optical splitter is connected with the second optical fiber communication equipment; the optical bypass system also comprises an optical switch device, and when the local site is powered off, the optical switch device switches the optical signals transmitted from the local upstream node to be directly transmitted.)

1. An optical bypass system, the system comprising: the first optical splitter receives an optical signal sent by the first optical fiber communication equipment, performs optical splitting processing on the optical signal and sends the optical signal to the second optical splitter; receiving the optical signal sent after the optical splitting processing of the first optical splitter and sending the optical signal to a second optical fiber communication device; the first optical splitter is connected with the second optical splitter, the first optical splitter is connected with a first port of intermediate optical fiber communication equipment, the second optical splitter is connected with a second port of the intermediate optical fiber communication equipment, the first optical splitter is connected with the first optical fiber communication equipment, and the second optical splitter is connected with the second optical fiber communication equipment; the optical bypass system also comprises an optical switch device, and when the local site is powered off, the optical switch device switches the optical signals transmitted from the local upstream node to be directly transmitted.

2. The light bypass system of claim 1, further comprising: the optical signal that receives second optical fiber communication equipment and send to fourth optical splitter after beam split processing, receive the optical signal that sends after the beam split processing of third optical splitter and send to the fourth optical splitter of first optical fiber communication equipment, the third optical splitter is connected fourth optical splitter, the third optical splitter is connected the second port of middle optical fiber communication equipment, fourth optical splitter connects the first port of middle optical fiber communication equipment, the third optical splitter is connected second optical fiber communication equipment, fourth optical splitter connects first optical fiber communication equipment.

3. The light bypass system of claim 2, wherein the first beam splitter has a splitting ratio that is coincident with the third beam splitter and the second beam splitter has a splitting ratio that is coincident with the fourth beam splitter.

4. The light bypass system of claim 2, wherein the first splitter and the third splitter have a splitting ratio of 2: 8.

5. The light bypass system of claim 2, wherein the system comprises: passive automatic light bypass system and three or more than three optical fiber communication equipment that connect gradually, and adjacent three optical fiber communication equipment be first optical fiber communication equipment, middle optical fiber communication equipment and second optical fiber communication equipment respectively, passive automatic light bypass system includes: the first optical splitter receives the optical signal sent by the first optical fiber communication equipment, performs optical splitting processing on the optical signal and sends the optical signal to the second optical splitter; a second optical splitter for receiving the optical signal sent by the first optical splitter after being split and sending the optical signal to the second optical fiber communication equipment; the first optical splitter is connected with the second optical splitter, the first optical splitter is connected with a first port of the intermediate optical fiber communication equipment, the second optical splitter is connected with a second port of the intermediate optical fiber communication equipment, the first optical splitter is connected with the first optical fiber communication equipment, and the second optical splitter is connected with the second optical fiber communication equipment.

6. The light bypass system of claim 5, wherein each of the fiber optic communication devices is connected in the form of a hand-held ring.

7. The optical bypass system of claim 5, wherein each of said fiber optic communications devices are chained.

8. The optical bypass system of claim 5, wherein the passive automatic optical bypass system is connected to the corresponding interface of the first optical fiber communication device on the ODF fiber shelf via a square bayonet pigtail or a round screw pigtail, wherein the passive automatic optical bypass system is connected to the corresponding interface of the second optical fiber communication device on the ODF fiber shelf via a square bayonet pigtail or a round screw pigtail, and wherein the passive automatic optical bypass system is connected to the intermediate optical fiber communication device via a square bayonet pigtail or a round screw pigtail.

Technical Field

The present invention relates generally to the field of communications, and more particularly to an optical bypass system.

Background

The core of the existing passive optical bypass system is two splitters, wherein the input end of each splitter corresponds to the downlink (TX) and the uplink (RX) of an optical fiber link, a certain output end of one splitter is butted with the output end of another splitter to form an adjacent node information path, and the other port of each splitter corresponds to the downlink signal analysis and the uplink signal transmission (or relay) of a local node. When the local communication node is powered off or fails, and the local switch cannot complete the local uplink and downlink of the optical fiber link, the passive optical bypass system can automatically bypass the failed local node and directly transmit the information of the remote nodes except the local communication node to the intelligent switching system of the corresponding node.

To this end, the present invention provides an optical bypass system to at least partially solve the above problems.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description section. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

To at least partially solve the above technical problem, the present invention provides an optical bypass system, comprising: the first optical splitter receives an optical signal sent by the first optical fiber communication equipment, performs optical splitting processing on the optical signal and sends the optical signal to the second optical splitter; receiving the optical signal sent after the optical splitting processing of the first optical splitter and sending the optical signal to a second optical fiber communication device; the first optical splitter is connected with the second optical splitter, the first optical splitter is connected with a first port of intermediate optical fiber communication equipment, the second optical splitter is connected with a second port of the intermediate optical fiber communication equipment, the first optical splitter is connected with the first optical fiber communication equipment, and the second optical splitter is connected with the second optical fiber communication equipment; the optical bypass system also comprises an optical switch device, and when the local site is powered off, the optical switch device switches the optical signals transmitted from the local upstream node to be directly transmitted.

Further, the optical signal sent by the second optical fiber communication device is received and subjected to optical splitting processing, and then sent to a third optical splitter of a fourth optical splitter, the optical signal sent after the optical splitting processing of the third optical splitter is received and sent to a fourth optical splitter of the first optical fiber communication device, the third optical splitter is connected to the fourth optical splitter, the third optical splitter is connected to the second port of the middle optical fiber communication device, the fourth optical splitter is connected to the first port of the middle optical fiber communication device, the third optical splitter is connected to the second optical fiber communication device, and the fourth optical splitter is connected to the first optical fiber communication device.

Further, the splitting ratios of the first splitter and the third splitter are the same, and the splitting ratios of the second splitter and the fourth splitter are the same.

Further, the splitting ratio of the first splitter to the third splitter is 2: 8.

Further, the system comprises: passive automatic light bypass system and three or more than three optical fiber communication equipment that connect gradually, and adjacent three optical fiber communication equipment be first optical fiber communication equipment, middle optical fiber communication equipment and second optical fiber communication equipment respectively, passive automatic light bypass system includes: the first optical splitter receives the optical signal sent by the first optical fiber communication equipment, performs optical splitting processing on the optical signal and sends the optical signal to the second optical splitter; a second optical splitter for receiving the optical signal sent by the first optical splitter after being split and sending the optical signal to the second optical fiber communication equipment; the first optical splitter is connected with the second optical splitter, the first optical splitter is connected with a first port of the intermediate optical fiber communication equipment, the second optical splitter is connected with a second port of the intermediate optical fiber communication equipment, the first optical splitter is connected with the first optical fiber communication equipment, and the second optical splitter is connected with the second optical fiber communication equipment.

Further, each optical fiber communication device is connected in the form of a hand-pulling ring.

Further, the optical fiber communication devices are connected in a chain.

Furthermore, the passive automatic optical bypass system is connected with a corresponding interface of the first optical fiber communication equipment on the ODF optical fiber rack through a square bayonet joint tail fiber or a circular thread head tail fiber, the passive automatic optical bypass system is connected with a corresponding interface of the second optical fiber communication equipment on the ODF optical fiber rack through a square bayonet joint tail fiber or a circular thread head tail fiber, and the passive automatic optical bypass system is connected with the middle optical fiber communication equipment through a square bayonet joint tail fiber or a circular thread head tail fiber.

Compared with the prior art, the invention has the beneficial effects that: the invention is a passive bypass system applied in the field of optical fiber communication, for the former mode, there is no need of power supply system, but there is trigger signal mechanism-the exchanger normally operates, the local can download, relay or uplink allopatric/local signal, the exchanger is powered off, the system only acts as transmission channel, and allopatric signal through the system can bypass as splitter for signal branch analysis and directly transmit to the appointed network node. The attenuated optical power of the system can be reduced by 6-14 dB compared with that of the prior art.

Drawings

In order that the advantages of the invention will be readily understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered to be limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings.

FIG. 1 is a schematic diagram of an embodiment of an automatic light bypass system;

FIG. 2 is a schematic diagram of an automatic light bypass system in another embodiment;

FIG. 3 is a schematic diagram of an interface of an automatic light bypass system in one embodiment;

FIG. 4 is a schematic diagram of an embodiment of an optical switching device;

fig. 5 is a schematic structural view of an optical switching device in another embodiment.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to obscure the embodiments of the invention.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The following detailed description of preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.

In the description of the present invention, the terms "inside", "outside", "longitudinal", "transverse", "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are for convenience only to describe the present invention without requiring the present invention to be necessarily constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1, an optical bypass system includes: a first optical splitter 110 that receives an optical signal sent by the first optical fiber communication device 210, performs optical splitting processing, and sends the optical signal to the second optical splitter 120; the second optical splitter 120 receives the optical signal sent by the first optical splitter 110 after being split and sends the optical signal to the second optical fiber communication device 230; the first optical splitter 110 is connected to the second optical splitter 120, the first optical splitter 110 is connected to a first port of the intermediate optical fiber communication device 220, the second optical splitter 120 is connected to a second port of the intermediate optical fiber communication device 220, the first optical splitter 110 is connected to the first optical fiber communication device 210, and the second optical splitter 120 is connected to the second optical fiber communication device 230.

In particular, an optical splitter, also called an optical splitter, is an optical fiber junction device having a plurality of input ends and a plurality of output ends, and is commonly used for coupling, branching and distributing optical signals. The beam splitter is composed of an incident slit, an emergent slit, a reflecting mirror and a dispersion element. The beam splitter is a passive device and does not require external energy, as long as there is input light. The passive automatic light bypass system including the first beam splitter 110 and the second beam splitter 120 is a passive system, and does not require external energy when operating, and thus has the advantages of maintenance-free and low cost.

An output end of the first optical splitter 110 is connected to an input end of the second optical splitter 120 to form a passive automatic optical bypass system, wherein an input end of the first optical splitter 110 is connected to the first optical fiber communication device 210, and another output end of the first optical splitter 110 is connected to a first port of the intermediate optical fiber communication device 220; the other input end of the second optical splitter 120 is connected to the second port of the intermediate optical fiber communication device 220, and the output end of the second optical splitter 120 is connected to the second optical fiber communication device 230. It should be noted that, in this case, the first port is an optical receiving port, and the second port is an optical emitting port, so that transmission of an optical signal from the first optical fiber communication device 210 to the second optical fiber communication device 230 is realized. The first optical splitter 110 receives the optical signal output by the first optical fiber communication device 210, and forms two optical signal outputs with different optical intensities after optical splitting, wherein the optical signal with stronger optical intensity is sent to the intermediate optical fiber communication device 220 through another output terminal of the first optical splitter 110, and the optical signal with weaker optical intensity is sent to an input terminal of the second optical splitter 120 through an output terminal of the first optical splitter 110. Two lines are formed in the passive automatic light bypass system, the first line is: when the intermediate optical fiber communication device 220 works normally, the optical signal with stronger light intensity is transmitted to the intermediate optical fiber communication device 220 through the other output end of the first optical splitter 110, and then is output through the intermediate optical fiber communication device 220 and transmitted to the second optical splitter 120; the second line is: the optical signal with weaker optical intensity is sent to the second optical splitter 120 through an output end of the first optical splitter 110, and since the intensity of the optical signal on the line is much smaller than that of the optical signal on the first line, when the intermediate optical fiber communication device works normally, the optical signal on the second line does not affect the normal work of the optical fiber communication device, and can be regarded as a noise signal. When the intermediate optical fiber communication device 220 is powered off or fails, the first line is in a disconnected state, and at this time, the first optical fiber communication device 210 is connected with the second optical fiber communication device 230 through the second line, so that the first optical fiber communication device 210 and the second optical fiber communication device 230 can work normally, and the influence of the power failure or the failure of the intermediate optical fiber communication device 220 on an optical fiber communication system is avoided.

It should be noted that, since the optical module of the optical fiber communication device tends to have a relatively high light receiving sensitivity, even a weak optical signal after being subjected to the light splitting processing can be perceived by the optical module of the optical fiber communication device, so as to perform transmission of the optical signal. The optical module of the optical fiber communication equipment has a large dynamic range for receiving light, and can receive a weak optical signal after optical splitting processing by the optical splitter and an optical signal after superposition of the optical signal of the original optical fiber communication system, and also can receive the optical signal after optical splitting processing by the optical splitter alone. Therefore, in the case of power failure or failure of the intermediate optical fiber communication device, the weaker optical signal after the optical splitting processing of the first optical fiber communication device 210 by the first optical splitter 110 can be transmitted to the second optical fiber communication device 230, so that the intermediate optical fiber communication device 220 is skipped, and signal transmission between the first optical fiber communication device 210 and the second optical fiber communication device 230 is realized, that is, the bypass function is realized. When the intermediate optical fiber communication device 220 works normally, although the second optical fiber communication device 230 can also sense the optical signal after the optical splitting process, since the intensity of the optical signal is weak at this time, it can be regarded as a noise signal and does not affect the normal communication. Therefore, the passive automatic light bypass system also has the advantage of wide application range. It can be understood that when the first optical fiber communication device 210, the intermediate optical fiber communication device 220, and the second optical fiber communication device 230 are in the bypass state, the optical intensity of the optical signal received by the corresponding optical module is within the lowest light-receiving range of the optical module.

The corresponding passive automatic optical bypass system is arranged on the optical fiber communication equipment, so that the power supply state and the optical signal output state in the optical fiber communication system can be automatically identified, when a certain node equipment is powered down or fails, the instantaneous switching of an optical path can be realized, the optical signal bypasses the failed node equipment, the optical signal is transmitted on the equipment at the two ends of the node equipment, the communication of the optical fiber communication system is ensured to be normal, and the N-X function is realized. In an optical fiber communication system with N-X functions, namely N network node devices, X node devices provided with a passive automatic optical bypass system can realize self-healing through the passive automatic optical bypass system, and the communication stability of the optical fiber communication system is ensured, wherein the number of X is less than or equal to the number of N. It is to be understood that the passive automatic optical bypass system may be a system independent of the intermediate optical fiber communication device, in which case the first optical splitter 110 of the passive automatic optical bypass system is connected to the external first port of the intermediate optical fiber communication device 220, and the second optical splitter 120 of the passive automatic optical bypass system is connected to the external second port of the intermediate optical fiber communication device 220. In another embodiment, the intermediate fiber optic communications device 220 and the passive automatic optical bypass system may also be integrated into the same device.

In one embodiment, referring to fig. 2, the passive automatic light bypass system further comprises: the optical signal sent by the second optical fiber communication device 230 is received and subjected to optical splitting processing, and then sent to the third optical splitter 130 of the fourth optical splitter 140, the optical signal sent by the optical splitting processing of the third optical splitter 130 is received and sent to the fourth optical splitter 140 of the first optical fiber communication device 210, the third optical splitter 130 is connected to the fourth optical splitter 140, the third optical splitter 130 is connected to the second port of the intermediate optical fiber communication device 220, the fourth optical splitter 140 is connected to the first port of the intermediate optical fiber communication device 220, the third optical splitter 130 is connected to the second optical fiber communication device 230, and the fourth optical splitter 140 is connected to the first optical fiber communication device 210.

Specifically, in the optical fiber communication system, communication is often bidirectional, in one direction, the first port of the intermediate optical fiber communication device 220 is an optical signal receiving port, and in the other direction, the first port of the intermediate optical fiber communication device 220 is an optical signal transmitting port. An output end of the third optical splitter 130 is connected to an input end of the fourth optical splitter 140, wherein an input end of the third optical splitter 130 is connected to the second optical fiber communication device 230, and another output end of the third optical splitter 130 is connected to the second port of the intermediate optical fiber communication device 220; the other input end of the fourth optical splitter 140 is connected to the first port of the intermediate optical fiber communication device 220, and the output end of the fourth optical splitter 140 is connected to the first optical fiber communication device 230. It should be noted that, in this case, the second port is an optical receiving port, and the first port is an optical emitting port, so that transmission of an optical signal from the second optical fiber communication device 230 to the first optical fiber communication device 210 is realized. The third optical splitter 130 receives the optical signal output by the second optical fiber communication device 230, and forms two optical signal outputs with different optical intensities after optical splitting, wherein the optical signal with stronger optical intensity is sent to the intermediate optical fiber communication device 220 through another output terminal of the third optical splitter 130, and the optical signal with weaker optical intensity is sent to an input terminal of the fourth optical splitter 140 through an output terminal of the third optical splitter 130. When the intermediate optical fiber communication device 220 works normally, the optical signal with stronger light intensity is transmitted to the intermediate optical fiber communication device 220 through the other output end of the third optical splitter 130, and then is output through the intermediate optical fiber communication device 220 and transmitted to the fourth optical splitter 140; the optical signal with weaker light intensity is sent to the fourth optical splitter 140 through an output end of the third optical splitter 130, and since the intensity of the optical signal on the line is much smaller than that of the optical signal on the other line, when the intermediate optical fiber communication device works normally, the optical signal on the line can be regarded as a noise signal, and the normal work of the optical fiber communication device cannot be affected. When the intermediate optical fiber communication device 220 is powered off or fails, the line of the optical signal with stronger light intensity is in a disconnected state, and at this time, the second optical fiber communication device 230 is connected with the first optical fiber communication device 210 through the line of the optical signal with weaker light intensity, so that the first optical fiber communication device 210 and the second optical fiber communication device can work normally, and the influence on the optical fiber communication system caused by the power failure or the failure of the intermediate optical fiber communication device 220 is avoided.

In one embodiment, the splitting ratio of the first splitter 110 is identical to that of the third splitter 130, and the splitting ratio of the second splitter 120 is identical to that of the fourth splitter 140.

Specifically, the first optical splitter 110 receives an optical signal transmitted by the first optical fiber communication device 210, performs optical splitting processing on the received optical signal, and transmits the optical signal to the second optical fiber communication device 230 through the second optical splitter 120; the third splitter 130 receives the optical signal transmitted by the second optical fiber communication device 230, and splits the received optical signal and transmits the split optical signal to the first optical fiber communication device 210 through the fourth splitter 1440. In the same broadcast communication system, the sizes of the optical signals emitted by the first optical fiber communication device 210 and the second optical fiber communication device 230 are often the same, so the first optical splitter 110 and the third optical splitter 120 with the same splitting ratio are selected, the optical signals with the same intensity are respectively subjected to splitting processing, and the optical signals are respectively sent to the corresponding optical fiber communication devices through the second optical splitter 120 and the fourth optical splitter 140 with the same splitting ratio, thereby ensuring the stability of the whole optical fiber communication system. It should be noted that, in another embodiment, the first optical splitter 110 and the third optical splitter 130, and the second optical splitter 120 and the fourth optical splitter 140 having the splitting ratios that are not different may also be used within the allowable error range, as long as the optical fiber communication system can operate stably.

Further, in one embodiment, the splitting ratios of the first splitter 110 and the third splitter 130 are 1:10, and the splitting ratios of the second splitter 120 and the fourth splitter 140 are 1: 1.

Specifically, the splitting ratio indicates a ratio of the optical power output by an output end of the optical splitter to the total output optical power, the splitting ratio of the first optical splitter is 2:8, wherein a ratio of the optical power output by an output end of the first optical splitter 110 to the optical power at the input end is 2:8, a ratio of the optical power output by another output end of the first optical splitter 110 to the optical power at the input end is 1:1, and the second optical splitter 120, the third optical splitter 130, and the fourth optical splitter 140 are similar to the first optical splitter 110, and are not described again. The splitting ratio of the first splitter 110 to the third splitter 130 is 1:10, which is suitable for the case that the optical signal of the optical fiber communication system is weak or the receiving sensitivity of the optical module of the optical fiber communication device is low.

It is understood that in another embodiment, the splitting ratio of the first splitter 110 to the third splitter 130 is 2:8, and the splitting ratio of the second splitter 120 to the fourth splitter 140 is 1: 1. In this embodiment, the first optical splitter 110 and the third optical splitter 130 have high splitting ratios, and are suitable for the case where the optical signal of the optical fiber communication system is strong or the optical module receiving sensitivity of the optical fiber communication device is high. It is understood that the first splitter 110 and the third splitter 130 may have other splitting ratios, such as 1:15, 1: 30, and the third splitter 130, which is selected specifically as the splitting ratio, should be determined according to the optical signal strength of the optical fiber communication system and the optical module receiving sensitivity of the optical fiber communication device.

In one embodiment, referring to fig. 3, the passive automatic optical bypass system has an appearance as shown in the figure, and in the actual use process, only the corresponding interface of the passive automatic optical bypass system is connected with the optical fiber communication equipment. Wherein WL _ RX is connected to the output end of the first optical fiber communication device 210, WD _ RX is connected to the first port of the intermediate optical fiber communication device 220, ED _ TX is connected to the second port of the intermediate optical fiber communication device 220, and EL _ RX is connected to the input end of the second optical fiber communication device 230, so that when the intermediate optical fiber communication device 220 is powered down or fails, signal transmission from the first optical fiber communication device 210 to the second optical fiber communication device 230 is realized, and normal operation of the optical fiber communication system is ensured. EL _ RX is connected to the output end of the second optical fiber communication device 230, ED _ RX is connected to the second port of the intermediate optical fiber communication device 220, WD _ TX is connected to the first port of the intermediate optical fiber communication device 220, WL _ TX is connected to the input end of the first optical fiber communication device 210, and when the intermediate optical fiber communication device 220 is powered down or fails, signal transmission from the second optical fiber communication device 230 to the first optical fiber communication device 210 is realized, so as to ensure normal operation of the optical fiber communication system.

In the passive automatic optical bypass system, the first optical splitter is connected to the first optical fiber communication device, the second optical splitter is connected to the second optical fiber communication device, the first optical splitter is connected to the first port of the intermediate optical fiber communication device, and the second optical splitter is connected to the second port of the intermediate optical fiber communication device; when the intermediate optical fiber communication equipment works normally, because the intensity of the optical signal sent after the optical signal is subjected to the optical splitting processing by the first optical splitter is very low, the optical signal processed by the first optical splitter can be taken as a noise signal, and the working of the power equipment cannot be influenced; when the intermediate optical fiber communication equipment is powered down, the optical signal processed by the first optical splitter can be used as the input signal of the second optical splitter, so that the signal of the optical fiber communication system bypasses the powered-down intermediate optical fiber communication equipment and is directly transmitted between the first optical fiber communication equipment and the second optical fiber communication equipment. The passive automatic optical bypass system and the optical fiber communication system avoid the influence of power failure of the intermediate optical fiber communication equipment on normal communication of the optical fiber communication system, and have the advantage of high operation reliability.

Referring to fig. 4 and 5, the passive automatic optical bypass system is further provided with an optical switch device, when the local station is powered down, the optical signal transmitted from the local upstream node is inverted and directly transmitted, and is not attenuated by 50% after 20% of the original optical signal (about 12dB signal attenuation), and the attenuation values of the optical signal are about 2dB local attenuation respectively. Local WL _ RX assumes a received optical power of 0dBm and local EL _ TX emits an optical power of-2 dBm.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "component" and the like, when used herein, can refer to either a single part or a combination of parts. Terms such as "mounted," "disposed," and the like, as used herein, may refer to one component as being directly attached to another component or one component as being attached to another component through intervening components. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the scope of the described embodiments. It will be appreciated by those skilled in the art that many variations and modifications may be made to the teachings of the invention, which fall within the scope of the invention as claimed.