阅读说明：本技术 一种双频光通信系统 (Dual-frequency optical communication system ) 是由 江红 倪卫华 于 2021-05-26 设计创作，主要内容包括：本发明公开一种双频光通信系统,包括：第一光信号发生器,于第一电流的驱动下生成具有第一中心频率的第一光信号；第二光信号发生器,于第二电流的驱动下生成具有第二中心频率的第二光信号；第一电流与第二电流的相位相反；第一光信号接收器,接收第一光信号并将第一光信号转换为第一电信号；第二光信号接收器,接收第二光信号并将第二光信号转换为第二电信号；比较器,接收第一电信号和第二电信号,并根据第一电信号和第二电信号输出差分信号。本发明的有益效果在于：通过设置频率不同的光通信信道避免了环境光对特定频率的光线的干扰,同时采用差分通信方式降低了通信系统整体的误码率,提高了通信系统整体的可靠性。(The invention discloses a dual-frequency optical communication system, comprising: the first optical signal generator is driven by the first current to generate a first optical signal with a first center frequency; the second optical signal generator is driven by the second current to generate a second optical signal with a second center frequency; the first current and the second current are opposite in phase; a first optical signal receiver which receives a first optical signal and converts the first optical signal into a first electrical signal; a second optical signal receiver which receives the second optical signal and converts the second optical signal into a second electrical signal; and the comparator receives the first electric signal and the second electric signal and outputs a differential signal according to the first electric signal and the second electric signal. The invention has the beneficial effects that: the interference of ambient light to light with specific frequency is avoided by setting the optical communication channels with different frequencies, and meanwhile, the error rate of the whole communication system is reduced and the reliability of the whole communication system is improved by adopting a differential communication mode.)

1. A dual-band optical communication system, comprising:

the first optical signal generator is driven by the first current to generate a first optical signal with a first center frequency;

the second optical signal generator is driven by the second current to generate a second optical signal with a second center frequency;

the first current is in opposite phase to the second current;

a first optical signal receiver that receives the first optical signal and converts the first optical signal into a first electrical signal;

a second optical signal receiver that receives the second optical signal and converts the second optical signal into a second electrical signal;

and the comparator receives the first electric signal and the second electric signal and outputs a differential signal according to the first electric signal and the second electric signal.

2. The optical communication system of claim 1, wherein the first optical signal generator and the second optical signal generator are the same type of electrical-to-optical converter, comprising:

a light source driving circuit connected to the external device;

and the light source is connected with the light source driving circuit.

3. The optical communication system of claim 2, wherein the first center frequency is different from the second center frequency.

4. The optical communication system according to claim 3, wherein a first narrow band filter having a first center frequency is disposed in front of an optical exit surface of the light source of the first optical signal generator;

and a second narrow-band filter with a second center frequency is arranged in front of the light-emitting surface of the light source of the second optical signal generator.

5. The optical communication system according to claim 4, wherein when the first narrow-band filter is provided in front of the first optical signal generator, the optical source is a broadband optical source including the first center frequency and the second center frequency;

when the second narrow-band filter is arranged in front of the second optical signal generator, the light source is a broadband light source including the first center frequency and the second center frequency.

6. The optical communication system of claim 3, wherein the first and second optical signal receivers further comprise a photodetector and an amplification circuit.

7. The optical communication system according to claim 6, wherein a reception frequency of the photodetector of the first optical signal receiver is the same as the first center frequency;

the receiving frequency of the photodetector of the second optical signal receiver is the same as the second center frequency.

8. The optical communication system of claim 6, wherein the photodetector of the first optical signal receiver is preceded by a third narrowband filter having a first center frequency.

9. The optical communication system of claim 6, wherein the photodetector of the second optical signal receiver is preceded by a fourth narrowband filter having a second center frequency.

Technical Field

The invention relates to the technical field of optical communication, in particular to a dual-frequency optical communication system.

Background

Optical communication technology refers to a communication method of directly transmitting an optical signal in a medium or vacuum using light as an information carrier. Compared with a common wireless radio frequency communication mode, the wireless radio frequency communication method has the advantages of no electromagnetic interference, controllable transmission path and the like.

However, in practical applications, the optical communication technology is often affected by ambient light, which results in problems such as shortened transmission distance and increased error rate, and in the prior art, the reliability of the entire communication system is generally increased by improving circuit design and changing optical wave modulation mode.

Disclosure of Invention

In view of the above problems in the prior art, a dual-band optical communication system is provided.

The specific technical scheme is as follows:

a dual-frequency optical communication system comprising: the first optical signal generator is driven by the first current to generate a first optical signal with a first center frequency; the second optical signal generator is driven by the second current to generate a second optical signal with a second center frequency; the first current is in opposite phase to the second current; a first optical signal receiver that receives the first optical signal and converts the first optical signal into a first electrical signal; a second optical signal receiver that receives the second optical signal and converts the second optical signal into a second electrical signal; and the comparator receives the first electric signal and the second electric signal and outputs a differential signal according to the first electric signal and the second electric signal.

Preferably, the first optical signal generator and the second optical signal generator are of the same type of electrical-to-optical converter, including: a light source driving circuit connected to the external device; and the light source is connected with the light source driving circuit.

Preferably, the first center frequency is different from the second center frequency.

Preferably, a first narrow-band filter with a first center frequency is arranged in front of the light-emitting surface of the light source of the first optical signal generator.

Preferably, a second narrow-band filter with a second center frequency is arranged in front of the light-emitting surface of the light source of the second optical signal generator.

Preferably, when the first narrow-band filter is disposed in front of the first optical signal generator, the optical source is a broadband optical source including the first center frequency and the second center frequency; when the second narrow-band filter is arranged in front of the second optical signal generator, the light source is a broadband light source including the first center frequency and the second center frequency.

Preferably, the first optical signal receiver and the second optical signal receiver further comprise a photodetector and an amplifying circuit; the receiving frequency of the photodetector of the first optical signal receiver is the same as the first center frequency; the receiving frequency of the photodetector of the second optical signal receiver is the same as the second center frequency.

Preferably, a third narrow-band filter having a first center frequency is disposed in front of the photodetector of the first optical signal receiver.

Preferably, a fourth narrow-band filter having a second center frequency is disposed in front of the photodetector of the second optical signal receiver.

The technical scheme has the following advantages or beneficial effects: the interference of ambient light to light with specific frequency is avoided by setting the optical communication channels with different frequencies, and meanwhile, the error rate of the whole communication system is reduced and the reliability of the whole communication system is improved by adopting a differential communication mode.

Drawings

Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings. The drawings are, however, to be regarded as illustrative and explanatory only and are not restrictive of the scope of the invention.

FIG. 1 is an overall schematic diagram of an embodiment of the present invention;

FIG. 2 is a signal diagram of an embodiment of the present invention;

FIG. 3 is a schematic view of another embodiment of the present invention;

fig. 4 is a schematic diagram of a differential signal generation process in the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

The present invention includes a dual-band optical communication system, as shown in fig. 1, comprising: a first optical signal generator 1 driven by a first current to generate a first optical signal having a first center frequency f 1; the second optical signal generator 2 is driven by a second current to generate a second optical signal with a second center frequency f 2; a first optical signal receiver 3 that receives the first optical signal and converts the first optical signal into a first electrical signal; a second optical signal receiver 4 that receives the second optical signal and converts the second optical signal into a second electrical signal; and a comparator 5 receiving the first electrical signal and the second electrical signal and outputting a differential signal according to the first electrical signal and the second electrical signal.

In a preferred embodiment, the first optical signal generator and the second optical signal generator are of the same type of electrical-to-optical converter, comprising: a light source driving circuit 11 and a light source driving circuit 12 connected to an external device; the light source 12 and the light source 22 are connected to the light source driving circuit 11 and the light source driving circuit 12, respectively.

In a preferred embodiment, the first optical signal and the second optical signal have different center frequencies.

In a preferred embodiment, the first current and the second current are in opposite phases.

Specifically, when the external device sends the same electrical signal to the first optical signal generator 1 and the second optical signal generator 2, the light source driving circuit 11 emits the first optical signal with the first current driving center frequency f1 from the light source 12, and the light source driving circuit 21 emits the second optical signal with the second current driving center frequency f2 from the light source 22.

In a preferred embodiment, as shown in fig. 2, the light source driving circuit 12 inverts the electrical signal and drives the light source 22 with a center frequency f2 to emit the second optical signal according to the inverted signal, wherein the first optical signal and the second optical signal form a differential communication channel. By setting the differential communication channel, the ambient light interference in the transmission process can be effectively avoided, the integral error rate of the communication system is reduced, and the integral reliability is improved.

In a preferred embodiment, as shown in fig. 3, first optical signal generator 1 is preceded by a first narrowband filter 13, first narrowband filter 13 having a center frequency f 1' corresponding to center frequency f1 of the first optical signal.

In a preferred embodiment, a second narrowband filter 23 is arranged upstream of the second optical signal generator 2, the center frequency f 2' of the second narrowband filter 23 corresponding to the center frequency f2 of the second optical signal.

Specifically, the first narrow-band filter 13 and the second narrow-band filter 23 are arranged in front of the light emitting surfaces of the light source 12 and the light source 22, so that light rays with large central frequency deviation can be filtered, and the accuracy of the optical communication system is improved.

In another embodiment, light source 12 and light source 22 are light sources with the same center frequency f, and the light sources can emit light with a wide frequency range, including frequency f1 'and frequency f 2', and by respectively setting first narrowband filter 13 with center frequency f1 'and second narrowband filter 23 with center frequency f 2', first optical signals and second optical signals with different frequencies can be generated when the same type of light source is used, so that the universality of components is improved, and the cost is reduced.

In a preferred embodiment, the first optical signal receiver 3 and the second optical signal receiver 4 further comprise a photodetector and an amplifying circuit; the reception frequency F1 of the first photodetector 31 of the first optical signal receiver 3 is the same as the center frequency F1 of the first optical signal; the receiving frequency F2 of the second photodetector 41 of the second optical signal receiver 4 is the same as the center frequency F2 of the second optical signal.

In a preferred embodiment, the first photodetector 31 of the first optical signal receiver 3 is preceded by a third narrowband filter 33, the third narrowband filter 33 having a center frequency F1' which is identical to the first center frequency F1.

In a preferred embodiment, second photodetector 41 of second optical signal receiver 4 is preceded by a fourth narrowband filter 43, fourth narrowband filter 43 having a center frequency F2' that is the same as second center frequency F2.

Specifically, in the optical communication process, the light received by the photodetector sometimes has different center frequencies due to environmental interference, transmission media, and other problems, which further generates bit errors and reduces the transmission rate and the overall reliability of the communication system. By setting the receiving frequency F1 of the photodetector of the first optical signal receiver 3 to be the same as the first center frequency F1; the receiving frequency F2 of the photodetector of the second optical signal receiver 4 is the same as the second center frequency F2, so that the interference of the ambient light different from the center frequencies of the first optical signal and the second optical signal can be effectively filtered, the error rate is reduced, and the transmission rate and the overall reliability of the system are improved.

Further, by arranging the third narrowband filter 33 and the fourth narrowband filter 34 in front of the first photodetector 31 of the first optical signal receiver 3 and the second photodetector 41 of the second optical signal receiver 4, the influence of the environmental interference and the transmission medium on the light in the optical transmission process can be effectively filtered.

Further, the first and second electrical signals emitted from the first and second photodetectors 31 and 41 are processed by the first and second amplifying circuits 32 and 42, so that the comparator can process the electrical signals conveniently.

In a preferred embodiment, the signal input to the comparator 5 is as shown in fig. 4.

In a preferred embodiment, the comparator 5 processes the electrical signals output by the first amplifying circuit 32 and the second amplifying circuit 42, as shown in table 1, the first loop formed by the first optical signal generator 1 and the first optical signal receiver 3 and the second loop formed by the second optical signal generator 2 and the second optical signal receiver 4 are differential communication loops, and the transmission signal is a digital signal. When the first loop and the second loop output a '0' signal or a '1' signal at the same time, the byte is invalid, which indicates that an error code occurs in the transmission process.

First loop	Second loop	Output result of the comparator
			1	0	1
0	1	0
			1	1	Invalidation
0	0	Invalidation

TABLE 1

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.