WO2022021747A1

WO2022021747A1 - Optical signal detection system

Info

Publication number: WO2022021747A1
Application number: PCT/CN2020/136539
Authority: WO
Inventors: 曾云; 谢卉; 李恒超; 谢兰枧
Original assignee: 武汉光迅科技股份有限公司
Priority date: 2020-07-28
Filing date: 2020-12-15
Publication date: 2022-02-03
Also published as: CN111947779A

Abstract

An optical signal detection system, comprising: a light source (101), configured to generate a first optical signal in a first wavelength range; a light splitting apparatus (102), configured to convert the first optical signal into a second optical signal having a different wavelength and emitted at a different angle; an optical signal detection apparatus (103), configured to detect the energy of the second optical signal having a different wavelength.

Description

An optical signal detection system

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on the Chinese patent application with the application number of 202010740641.6 and the filing date of July 28, 2020, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is incorporated herein by reference.

technical field

The present invention relates to the technical field of optical communication, in particular to an optical signal detection system.

Background technique

With the rapid development of intelligent optical networks and the expansion of the application scope of intelligent optical networks, the effective detection of multi-channel optical signals in intelligent optical networks has always been the goal pursued by optical communication technology.

SUMMARY OF THE INVENTION

The embodiments of the present application provide an optical signal detection system, which can realize effective detection of multi-channel optical signals.

The technical solutions of the embodiments of the present application are implemented as follows:

The embodiment of the present application provides an optical signal detection system, the system includes:

a light source configured to generate a first optical signal in a first wavelength range;

an optical splitting device, configured to convert the first optical signal into a second optical signal of different wavelengths exiting at different angles;

An optical signal detection device is configured to detect the energy of the second optical signals of different wavelengths.

In some embodiments, the system further includes: a first lens;

The first lens is disposed between the light source and the spectroscopic device, and is configured to convert a first optical signal in a first wavelength range generated by the light source into a parallel optical signal.

In some embodiments, the system further includes: a second lens;

The second lens is disposed between the spectroscopic device and the optical signal detection device, and is configured to converge the second optical signals of different wavelengths.

In some embodiments, the optical parameters of the first lens and the second lens are the same.

In some embodiments, the curvature of the first lens varies continuously along a direction from the center of the first lens to the edge of the first lens;

And/or, the curvature of the second lens changes continuously along the direction from the center of the second lens to the edge of the second lens.

In some embodiments, the optical signal detection device comprises: an optical fiber array;

Each optical fiber included in the optical fiber array is used for receiving second optical signals of different wavelengths, so as to detect the energy of the second optical signals of different wavelengths.

In some embodiments, the optical signal detection device further includes:

an array of photodiodes configured to detect energy of the second optical signal of different wavelengths.

In some embodiments, the photodiode array includes the same number of photodiodes as the fiber array includes optical fibers.

In some embodiments, the optical signal detection device further includes:

An actuator configured to control the optical fiber array to move in a direction perpendicular to the direction in which the second optical signal is transmitted in the optical fiber array.

In some embodiments, the optical signal detection device includes:

The line array light sensor is configured to perform optical integration on second light signals of different wavelengths received by different point sensors of the line array light sensor, and then convert them into effective photoelectric signals, and detect the energy of the effective photoelectric signals.

The optical signal detection system provided by the embodiment of the present application includes: a light source, configured to generate a first optical signal in a first wavelength range; Two optical signals; an optical signal detection device, configured to detect the energy of the second optical signal. In this way, since the first optical signal generated by the light source is in the first wavelength range and includes a first optical signal of multiple wavelengths, the first optical signal of multiple wavelengths can be converted to emit at different angles through the spectroscopic device second optical signals of different wavelengths, so that the optical signal detection device detects the energy of the second optical signals of different wavelengths; and realizes effective detection of multi-channel optical signals.

Description of drawings

FIG. 1 is a schematic diagram of an optional structure of an optical signal detection system provided by an embodiment of the present application;

2 is a schematic diagram of a relationship between the wavelength of the first optical signal and the transmittance curve of the filter coated with the first film layer according to the embodiment of the present application;

3 is a schematic diagram of another optional structure of an optical signal detection system provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of another optional structure of an optical signal detection system provided by an embodiment of the present application;

FIG. 5 is a schematic structural diagram of an optical signal detection system in the related art.

detailed description

The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

An important device in modern intelligent optical network is Tunable Optical Filter (TOF). The research and development of tunable optical filter is of great significance for flexible selection and dynamic monitoring of optical channels. However, the tunable optical filter in the related art has problems such as complex structure and high cost.

An embodiment of the present application provides an optical signal detection system. An optional structure of the optical signal detection system 100, as shown in FIG. 1, includes:

The light source 101 is configured to generate a first optical signal in a first wavelength range.

In some embodiments, the optical signal generated by the light source 101 has a first wavelength range, that is, the first optical signal generated by the light source 101 is a first optical signal with a wide wavelength range.

In some embodiments, the first optical signal generated by the light source 101 may be transmitted through an optical fiber.

The optical splitting device 102 is configured to convert the first optical signal into a second optical signal with different wavelengths exiting at different angles.

In some embodiments, the function of the spectroscopic device 102 may be implemented by a grating. In the case where the spectroscopic device 102 is an optical fiber, the grating utilizes the principle of optical multi-slit diffraction to disperse the first optical signal incident on the grating, and converts the first optical signal with a wide wavelength range incident on the grating into different diffraction angles. Outgoing parallel light signals of different wavelengths. The parallel optical signals of different wavelengths emitted according to different diffraction angles are multi-channel optical signals.

The optical signal detection device 103 is configured to detect the energy of the second optical signals of different wavelengths.

In some embodiments, since the second optical signals of different wavelengths are multi-channel optical signals, the optical signal detection device 103 can detect the energy of the optical signals of each channel in the multi-channel optical signals.

In some embodiments, the optical signal detection system 100 may further include: a first lens 104, the first lens 104 is disposed between the light source 101 and the spectroscopic device 102, and is configured to connect the light source 101 The generated diverging first optical signals of the first wavelength range are converted into parallel optical signals.

In some embodiments, the first lens 104 may be an aspherical lens, and the curvature of the aspherical lens varies continuously along the direction from the center of the first lens to the edge of the first lens.

In some embodiments, the optical signal detection system 100 may further include: a second lens 105, the second lens 105 is disposed between the spectroscopic device 102 and the optical signal detection device 103, and is configured to The second optical signals of different wavelengths are aggregated.

In some embodiments, the second lens 105 may be an aspherical lens, and the curvature of the aspherical lens varies continuously along the direction from the center of the first lens to the edge of the second lens. After passing through the second lens 105, the parallel second optical signals of different wavelengths are focused on different positions on the focal plane of the second lens 105 according to the order of the wavelengths from large to small or from small to large.

In some embodiments, the optical parameters of the first lens 104 and the second lens 105 are the same. Wherein, the optical parameters may at least include: curvature and/or focal length.

In one embodiment, the optical signal detection device 103 includes an optical fiber array, and each optical fiber included in the optical fiber array is used to receive second optical signals of different wavelengths, so as to detect the energy of the second optical signals of different wavelengths.

In some embodiments, a bundle of optical fibers is mounted on the array substrate using a V-groove,

In some embodiments, the optical fiber array is located on the focal plane of the second lens 105, and optical fibers at different positions on the optical fiber array are respectively used to receive second optical signals of different wavelengths.

In some embodiments, the optical signal detection device 103 further includes: a photodiode array 107 for detecting the energy of the second optical signal with different wavelengths.

In some embodiments, the number of fibers in the fiber array is the same as the number of photodiodes in the photodiode array; each fiber in the fiber array is connected to one photodiode in the photodiode array, and one photodiode is used for The energy of the second optical signal transmitted by the optical fiber connected thereto is detected.

In some embodiments, the photodiode is a semiconductor device consisting of a PN junction configured to convert the received optical power of the second optical signal into an electrical current.

In some embodiments, the optical signal detection system 100 further includes:

The actuator 106 is configured to control the optical fiber array to move in a direction perpendicular to the direction in which the second optical signal is transmitted in the optical fiber array.

In some embodiments, the function of the transmission device 106 can be realized by a linear motor, the transmission device 106 converts electrical energy into mechanical energy of linear motion, and then drives the optical fiber array along the optical fiber with the second optical signal. The direction of transmission in the array moves in the vertical direction.

In another embodiment, the optical signal detection device 103 includes a line array light sensor, configured to perform optical integration on second light signals of different wavelengths received by different point sensors of the line array light sensor, and then convert them into effective photoelectricity signal, and detect the energy of the effective photoelectric signal.

In some embodiments, the linear array optical sensor is a one-dimensional photoelectric sensor, which can perform optical integration on the second optical signal output by the optical fiber array to obtain effective optical signals corresponding to different wavelengths, and detect the effective optical signals of different wavelengths the energy of the signal.

The following describes the composition and structure of the optical signal detection system provided by the embodiment of the present application by taking the optical signal detection device including an optical fiber array as an example, as shown in FIG. 2 : the optical signal detection system includes: a light source 01, a first aspherical lens 04, grating 02, second aspheric lens 05 and fiber array 03.

In some embodiments, the optical signal with a wide wavelength range generated by the light source 01 is transmitted through the optical fiber, and the optical signal includes diverging optical signals with wavelengths λ ₁ , λ ₂ , λ ₃ , . . . , λ _n ; the diverging optical signals are transmitted through the first An aspherical lens 04 is then converted into a parallel light signal with a wide wavelength range. After the parallel light signal with a wide wavelength range of the first aspheric lens 04 is incident on the grating 02, the grating 02 decomposes the incident parallel light signal with a wide wavelength range into parallel light signals with different wavelengths that are emitted according to different diffraction angles. . The parallel light signals of different wavelengths emitted through the grating 02 pass through the second aspherical lens 05 and then focus on different positions of the second aspherical lens 05 according to the order of wavelengths from large to small or from small to large.

In some embodiments, the optical fiber array 03 is located at the focal plane position of the second aspheric lens 05 , so that the optical fiber array 03 can receive the optical signal exiting through the second aspheric lens 05 . And each optical fiber in the optical fiber array 03 receives an optical signal of one wavelength emitted by the second aspherical lens 05, so that receiving optical signals of different wavelengths through different optical fibers can be used for wide-wavelength optical signals. The separation of signals of different wavelengths realizes the function of a multi-channel optical filter.

Taking the optical signal detection device including an optical fiber array and a linear motor as an example, that is, adding a linear motor on the basis of the optical signal detection system shown in FIG. 2 , the composition structure of the optical signal detection system provided by the embodiment of the present application will be described. As shown in FIG. 3 , the optical signal detection system includes: a light source 01 , a first aspherical lens 04 , a grating 02 , a second aspherical lens 05 , an optical fiber array 03 and a linear motor 06 .

In some embodiments, the optical fiber array 03 is carried on the linear motor 06, so that the linear motor 06 can drive the optical fiber array 03 to move back and forth along the direction parallel to the focal plane of the second aspheric lens 05, so that the optical fiber array can be controlled Which fiber in 03 is used to receive which wavelength of optical signal. In this way, the signals of different wavelengths in the wide-wavelength optical signal can be separated, and the optical fibers that receive the optical signals of different wavelengths can be selected, that is, the function of a multi-channel tunable optical filter can be realized.

The following is an example of an optical signal detection device including an optical fiber array, a linear motor, and a photodiode array, that is, a photodiode array is added on the basis of the optical signal detection system shown in FIG. 3 . The structure is described, as shown in Figure 4: the optical signal detection system includes: a light source 01, a first aspherical lens 04, a grating 02, a second aspherical lens 05, an optical fiber array 03, a linear motor 06 and a photodiode array 07 .

In some embodiments, the optical fiber array 03 is located at the focal plane position of the second aspheric lens 05 , so that the optical fiber array 03 can receive the light signal exiting through the second aspheric lens 05 . And each optical fiber in the optical fiber array 03 receives an optical signal of one wavelength that is emitted through the second aspheric lens 05, so that receiving optical signals of different wavelengths through different optical fibers can be used for wide-wavelength optical signals. The separation of signals of different wavelengths is to realize the function of multi-channel optical filter.

In some embodiments, each fiber in fiber array 03 is connected to one photodiode in photodiode array 07, respectively.

In some embodiments, the optical fiber array 03 is carried on the linear motor 06 , so that the linear motor 06 can drive the optical fiber array 03 to move back and forth along the direction parallel to the focal plane of the second aspheric lens 05 , by controlling the linear motor 06 The fast movement makes each fiber in the fiber array 03 quickly scan the optical signals of all wavelengths, and the optical signals are converted into electrical signals through the photodiode array 07 for spectral integration, thus realizing the multi-channel optical signal detection function .

The composition and structure of the optical signal detection system provided by the embodiment of the present application will be described below by taking the optical signal detection device including a linear array optical sensor as an example, as shown in FIG. 5 : the optical signal detection system includes: a light source 01, a first non- Spherical lens 04 , grating 02 , second aspherical lens 05 and linear light sensor 08 .

In some embodiments, the line array light sensor 08 is located at the focal plane position of the second aspherical lens 05 , so that the line array light sensor 08 can receive the light signal emitted through the second aspherical lens 05 . And each point light sensor in the line array light sensor 08 receives a light signal of one wavelength emitted through the second aspheric lens 05 , so that it is received by different point light sensors in the line array light sensor 08 Optical signals of different wavelengths can separate the signals of different wavelengths in the wide-wavelength optical signal, that is, to realize the function of a multi-channel optical filter. After receiving the optical signals of different wavelengths by different point light sensors in the linear light sensor 08, the effective photoelectric signals are obtained through the optical integration pair, and then the spectral information of the full wavelength range can be obtained in real time, and the optical signal of a wide wavelength range can be obtained. detection.

To sum up, the optical signal detection system provided in the embodiments of the present application can implement the functions of a multi-channel optical filter, a multi-channel tunable optical filter, multi-channel optical performance monitoring, and real-time optical performance monitoring. In addition, the optical signal detection system provided by the embodiments of the present application has a simple optical path and various achievable functions; since the optical signal detection system provided by the embodiments of the present application has no moving parts, the performance of the optical signal detection system is stable.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

An optical signal detection system, the system includes:

a light source configured to generate a first optical signal in a first wavelength range;

an optical splitting device, configured to convert the first optical signal into a second optical signal of different wavelengths exiting at different angles;

An optical signal detection device is configured to detect the energy of the second optical signals of different wavelengths.
The system of claim 1, wherein the system further comprises: a first lens;

The first lens is disposed between the light source and the spectroscopic device, and is configured to convert a first optical signal in a first wavelength range generated by the light source into a parallel optical signal.
The system of claim 2, wherein the system further comprises: a second lens;

The second lens is disposed between the spectroscopic device and the optical signal detection device, and is configured to converge the second optical signals of different wavelengths.
The system of claim 3, wherein the first lens and the second lens have the same optical parameters.
The system of claim 3, wherein the curvature of the first lens varies continuously along a direction from a center of the first lens to an edge of the first lens;

And/or, the curvature of the second lens changes continuously along the direction from the center of the second lens to the edge of the second lens.
The system according to any one of claims 1 to 5, wherein the optical signal detection device comprises: an optical fiber array;

Each optical fiber included in the optical fiber array is used for receiving second optical signals of different wavelengths, so as to detect the energy of the second optical signals of different wavelengths.
The system according to claim 6, wherein the optical signal detection device further comprises:

an array of photodiodes configured to detect energy of the second optical signal of different wavelengths.
8. The system of claim 7, wherein the photodiode array includes the same number of photodiodes as the fiber array includes optical fibers.
The system according to claim 6, wherein the optical signal detection device further comprises:

An actuator configured to control the optical fiber array to move in a direction perpendicular to the direction in which the second optical signal is transmitted in the optical fiber array.
The system according to any one of claims 1 to 5, wherein the optical signal detection device comprises:

The line array light sensor is configured to perform optical integration on second light signals of different wavelengths received by different point sensors of the line array light sensor, and then convert them into effective photoelectric signals, and detect the energy of the effective photoelectric signals.