WO2016192008A1

WO2016192008A1 - Apparatus, device and method for generating local oscillating light source with same frequency

Info

Publication number: WO2016192008A1
Application number: PCT/CN2015/080492
Authority: WO
Inventors: 满江伟; 张强; 冀瑞强; 曾理
Original assignee: 华为技术有限公司
Priority date: 2015-06-01
Filing date: 2015-06-01
Publication date: 2016-12-08
Also published as: CN107408793B; CN107408793A

Abstract

An apparatus, device and method for generating a local oscillating light source with a same frequency. The method comprises: locking a light wavelength of a signal and generating a local oscillating light source by using a same micro-ring structure filter, thus realizing a strict alignment with the light wavelength of the signal by the local oscillating light source. The local oscillating light source can perform tracking and feedback according to the shift of the light wavelength, thereby realizing self-adaptive homodyne detection.

Description

Generating device, device and method for same frequency local oscillator light source

Technical field

The present invention relates to the field of optics, and in particular, to a device, device and method for generating a same frequency local oscillator light source.

Background technique

Coherent transmission scheme is an important means for long-distance transmission of optical transmission network. It can usually include narrow linewidth tunable laser, in-phase quadrature (IQ) modulator, coherent receiver and local oscillator. Part of the light source. The so-called coherent transmission, that is, the transmitting end uses a tunable laser to generate a laser beam, performs intensity modulation and phase modulation in the IQ modulator, and realizes polarization multiplexing to obtain signal light; the receiving end receives the received signal light and the local oscillator. The light source performs coherent detection to achieve signal reception. The coherent detection is linear detection, and the phase information of the signal light can be directly obtained, and the phase information can be directly compensated for dispersion, and is suitable for communication links with long distance and large dispersion.

In existing optical transmission devices, a tunable laser is usually provided at the transmitting end and the receiving end, respectively. As shown in FIG. 1, the transmitting end uses the tunable laser 1 as a light source, is modulated by an IQ modulator, and the receiving end is equipped with another tunable laser 2 to perform coherent detection as a local light source and a signal light transmitted from the transmitting end. During use, the tunable laser 2 at the receiving end needs to be frequency-negotiated and locked with the tunable laser 1 at the transmitting end to perform wavelength alignment (ie, frequency alignment) to achieve internal difference detection.

The tunable laser as the local oscillator source can be implemented by using a micro-ring structure, and the micro-ring structure can specifically include a micro-ring structure filter, a Bragg selection grating, a gain waveguide, and/or a reflection cavity surface, as shown in FIG. 2A. And Figure 2B shows an implementation of two tunable lasers based on a microring structure that adjusts the Bragg grating and the microring filter structure to achieve different wavelength alignments and achieve wavelength tunable purpose.

However, in actual use, there are two problems:

First, the two methods of frequency negotiation and locking do not make the transmitter and receiver adjustable. The wavelength of the harmonic laser is strictly aligned. It is usually stipulated that when the wavelength difference between the two is in the range of 0.04 nm, the wavelengths of the two are considered to be aligned. When the range is exceeded, the wavelength is considered to be misaligned, and the receiving end needs to be corresponding. Digital Signal Processing (English: Digital Signal Processing, referred to as: DSP), tracking and compensating for the frequency difference between the two, which undoubtedly increases the complexity and power consumption of the system.

Second, when the wavelength of the tunable laser at the transmitting end changes, for example, its wavelength drifts during the lifetime of the device, the tunable laser at the receiving end cannot adaptively adjust according to the wavelength of the signal light sent by the transmitting end, Real-time alignment of the wavelength of the signal light.

Summary of the invention

The embodiments of the present invention provide a device, a device, and a method for generating a same frequency local oscillator light source, which are used to solve the problem that the wavelengths of two tunable lasers at the transmitting end and the receiving end cannot be strictly aligned and aligned in real time.

In a first aspect, an embodiment of the present invention provides a device for generating a same frequency local oscillator light source, including:

a first port, configured to receive the first signal light;

a micro ring structure filter, configured to filter the first signal light received by the first port to obtain a second signal light;

a second port, configured to send the set portion of the second signal light obtained by the micro ring structure filter to the first PD;

The first PD is configured to perform optical power detection on the set portion of the second signal light to obtain a first optical power, and send the first optical power to the first control circuit;

The first control circuit is configured to adjust a center wavelength of the micro ring structure filter until the received first optical power reaches a maximum value, and determines that the first optical power reaches a maximum value The center wavelength to which the microring structure filter is currently adjusted is initially aligned with the center wavelength of the first signal light;

a semiconductor laser for outputting a lasing light whose center wavelength is a center wavelength to which the micro ring structure filter is currently adjusted, and transmitting the set portion of the lasing light to the second PD;

The second PD is configured to perform optical power detection on the set portion of the lasing light to obtain a second Optical power, and transmitting the second optical power to the second control circuit;

The second control circuit is configured to adjust a center wavelength of the semiconductor laser until the received second optical power reaches a maximum value, and determine that the semiconductor laser is current when the second optical power reaches a maximum value The center wavelength to which it is adjusted is strictly aligned with the center wavelength of the first signal light.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the first control circuit is specifically configured to generate an electrical signal by controlling a first heater inside the micro-ring structure filter to implement adjustment The center wavelength of the microring structure filter.

In conjunction with the first aspect or the first possible implementation of the first aspect, in a second possible implementation of the first aspect, the micro-ring structure filter is in the semiconductor laser, and the semiconductor laser further Including a third port and a fourth port;

Wherein, by integrating a transflective cavity surface at the third port, integrating a reflective cavity surface at the fourth port such that the third port and the fourth port constitute a resonant cavity, and the third port integrates a second heating Device

The microring structure filter locks the semiconductor laser to lasing at a center wavelength to which the wavelength of the microring structure filter is currently adjusted;

a resonant cavity formed by the third port and the fourth port, and the lasing obtained center wavelength of the lasing light whose center wavelength is currently adjusted by the micro ring structure filter is output from the third port;

The third port sends the set portion of the lasing light to the second PD;

The second heater of the third port realizes adjusting the center wavelength of the semiconductor laser by adjusting the cavity length of the resonant cavity under the control of the second PD.

In conjunction with the second possible implementation of the first aspect, in a third possible implementation of the first aspect, the second port and the third port are integrated with a branch waveguide, and the branch waveguide is configured to divide the light into a two-part ratio;

The first port, the second port, the third port, and the fourth port are respectively connected to the micro ring structure filter through a waveguide.

In conjunction with the first aspect and any one of the first to third possible implementations of the first aspect, in a fourth possible implementation of the first aspect, the first port is integrated with a branch waveguide, The device also includes a third PD, wherein:

The first port is further configured to send the set portion of the first signal light to the third PD;

The third PD is configured to perform optical power detection on the set portion of the first signal light to obtain a third optical power, and send the third optical power to the first control circuit;

The first control circuit is specifically configured to adjust a center wavelength of the micro ring structure filter until a ratio of the received third optical power to the first optical power reaches a maximum value, and determines the ratio The center wavelength to which the microring structure filter is currently adjusted is initially aligned to the center wavelength of the first signal light when the maximum value is reached.

In a second aspect, an embodiment of the present invention provides a device for generating a same frequency local oscillator light source, including:

a common waveguide having a signal light incident port and an integrated reflective cavity port;

The apparatus of any one of the first to third possible implementations of the first aspect and the first aspect, for generating a plurality of signals corresponding to signal light of a plurality of wavelengths, respectively The same frequency local oscillator light source, wherein the plurality of devices are connected to the common waveguide, sharing a signal light incident port of the common waveguide and an integrated reflective cavity surface port.

In a third aspect, an embodiment of the present invention provides a method for generating a local frequency local oscillator light source, including:

Receiving a first signal light;

The first signal light is filtered by using a micro ring structure filter to obtain a second signal light;

And coupling a set portion of the second signal light to perform optical power detection to obtain a first optical power;

Adjusting a center wavelength of the micro ring structure filter such that the first optical power reaches a maximum value, and determining that the micro ring structure filter is currently adjusted when the first optical power reaches a maximum value The center wavelength is initially aligned with a center wavelength of the first signal light;

The output center wavelength is lasing light of a central wavelength to which the microring structure is currently adjusted;

And coupling a portion of the lasing light to perform optical power detection to obtain a second optical power;

Adjusting a center wavelength of the lasing light such that the second optical power reaches a maximum value, and determining that the center wavelength of the lasing light is currently adjusted to a strict alignment when the second optical power reaches a maximum value The center wavelength of the first signal light.

In conjunction with the third aspect, in a first possible implementation of the third aspect, the microring is adjusted The center wavelength of the structure filter, including:

Generating an electrical signal The central wavelength of the filter of the microring structure is adjusted by controlling a first heater inside the microring structure filter.

With reference to the third aspect, or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the method further includes:

And coupling a set portion of the first signal light to perform optical power detection to obtain a third optical power;

Adjusting a center wavelength of the micro ring structure filter such that the first optical power reaches a maximum value, and determining that the micro ring structure filter is currently adjusted when the first optical power reaches a maximum value The center wavelength is initially aligned with the center wavelength of the first signal light, including:

Adjusting a center wavelength of the micro ring structure filter such that a ratio of the third optical power to the first optical power reaches a maximum value, and determining that the ratio reaches a maximum value The center wavelength to which the current adjustment is made is initially aligned with the center wavelength of the first signal light.

In a fourth aspect, an embodiment of the present invention provides a device for generating a same frequency local oscillator light source, including:

a receiving unit, configured to receive the first signal light;

a filtering unit, configured to filter the first signal light by using a micro ring structure filter to obtain a second signal light;

a first detecting unit, configured to couple a set portion of the second signal light to perform optical power detection, to obtain a first optical power;

a first adjusting unit, configured to adjust a center wavelength of the micro ring structure filter such that the first optical power reaches a maximum value, and determine that the first optical power reaches a maximum value a center wavelength to which the filter is currently adjusted is initially aligned with a center wavelength of the first signal light;

An output unit, configured to output lasing light whose center wavelength is a central wavelength to which the microring structure is currently adjusted;

a second detecting unit, configured to couple the set portion of the lasing light to perform optical power detection, to obtain a second optical power;

a second adjusting unit, configured to adjust a center wavelength of the lasing light such that the second optical power reaches a maximum value, and determine that the lasing light is currently adjusted when the second optical power reaches a maximum value The center wavelength of the node is strictly aligned with the center wavelength of the first signal light.

In conjunction with the fourth aspect, in a first possible implementation manner of the fourth aspect, the first adjusting unit is specifically configured to:

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the device further includes:

a third detecting unit, configured to couple the set portion of the first signal light to perform optical power detection, to obtain a third optical power;

The first adjusting unit is specifically configured to adjust a center wavelength of the micro ring structure filter such that a ratio of the third optical power to the first optical power reaches a maximum value, and determine that the ratio reaches The center wavelength to which the microring structure filter is currently adjusted is initially aligned with the center wavelength of the first signal light.

By using the solution provided by the embodiment of the present invention, by using the same micro-ring structure filter to lock the wavelength of the signal light and the generation of the local oscillator light source, the strict alignment of the wavelength of the signal light by the local oscillator light source is realized, and at the same time, the local oscillator light source Tracking feedback can be performed with the drift of the signal light wavelength to achieve adaptive homodyne detection.

DRAWINGS

1 is a schematic diagram of a configuration of an optical transmission device in the prior art;

2A and 2B are schematic diagrams showing the structure of a tunable laser using a microring structure in the prior art;

3 is a schematic structural diagram of a device for generating a same frequency local oscillator light source according to an embodiment of the present invention;

4 is a schematic structural diagram of another apparatus for generating a local frequency local oscillator according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a device for generating a multi-channel and same frequency local oscillator light source according to an embodiment of the present invention;

FIG. 6 is a flowchart of a method for generating a local frequency local oscillator light source according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another apparatus for generating a local frequency local oscillator according to an embodiment of the present invention.

detailed description

The present invention will be further described in detail with reference to the accompanying drawings, in which FIG. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment of the invention provides a generating device, device and method for the same frequency local oscillator light source, which realizes the signal of the local oscillator light source by using the same micro ring structure filter to lock the wavelength of the signal light and generate the local oscillator light source. The precise alignment of the light wavelength, at the same time, the local oscillator light source can track and feedback with the drift of the signal light wavelength, thereby achieving adaptive homodyne detection.

The technical solutions of the present invention will be described below in conjunction with the drawings and the embodiments.

Referring to FIG. 3, an embodiment of the present invention provides a generating device for a local oscillator local light source, which mainly includes a micro ring structure filter and four ports, and the micro ring structure filter connects four ports through a waveguide. . The modulated signal light from the transmitting end is injected from the first port, filtered, and then emitted from the second port, and the generated local oscillator light source is emitted from the fourth port. Wherein, the device realizes preliminary locking of the wavelength of the signal light under the action of the micro-ring structure filter and the first and second ports, and finally generates and is incident under the action of the micro-ring structure filter and the third and fourth ports. The lasing light whose signal light wavelength is strictly aligned. In the following, the components of the device are described in detail:

The first port is configured to receive the first signal light.

The first signal light is the modulated signal light coming from the transmitting end.

And a micro ring structure filter, configured to filter the first signal light received by the first port to obtain a second signal light.

Wherein the center wavelength of the second signal light is the same as the center wavelength of the first signal light, There is a difference in light intensity. The closer the center wavelength of the micro-loop structure filter is to the center wavelength of the first signal light, the stronger the light intensity of the second signal light.

Since the filter of the current optical filter having only the micro-ring structure has four ports, the filter of the remaining structure is generally only two, and in the embodiment of the present invention, the filter needs to be connected to the four ports. Therefore, the embodiment of the present invention The filter of the microring structure is selected. Of course, if an optical filter having four or more ports of other structures is developed in the future, the micro ring structure filter in the embodiment of the present invention may be replaced with the optical filter.

a second port, configured to send the set portion of the second signal light obtained by the micro ring structure filter to the first photodetector (English: Photo Detector, abbreviated as PD).

The first PD is configured to perform optical power detection on the set portion of the second signal light to obtain a first optical power, and send the first optical power to the first control circuit.

The first control circuit is configured to adjust a center wavelength of the micro ring structure filter until the received first optical power reaches a maximum value, because a center wavelength of the micro ring structure filter and the first The closer the center wavelength of a signal light is, the less the first signal light is filtered out, and the stronger the intensity of the second signal light obtained after filtering, so that it can be determined that the first optical power reaches At a maximum value, the center wavelength to which the microring structure filter is currently adjusted is initially aligned with the center wavelength of the first signal light.

a semiconductor laser for outputting lasing light having a center wavelength which is a center wavelength to which the micro ring structure filter is currently adjusted (ie, λ ₂ ), and transmitting the set portion of the lasing light to the second PD.

The second PD is configured to perform optical power detection on the set portion of the lasing light to obtain a second optical power, and send the second optical power to the second control circuit.

Assuming that the center wavelength to which the semiconductor laser is currently adjusted is λ ₃ , then λ _{3 is} completely equal to the center wavelength λ _{0 of} the first signal light.

Wherein the micro ring structure filter is in the semiconductor laser, and the semiconductor laser further includes a third port and a fourth port.

The embodiment of the present invention integrates a transflective cavity surface at the third port, and integrates a reflective cavity surface at the fourth port such that the third port and the fourth port constitute a resonant cavity, and the third port is integrated Two heaters. Optionally, a semiconductor optical amplifier (Semiconductor Optical Amplifier, SOA for short) may be integrated as the gain medium in the third port or the fourth port, and the second heater may also be integrated in the fourth port.

The microring structure filter locks the semiconductor laser to lasing at a center wavelength at which the wavelength of the microring structure filter is currently adjusted.

The resonant cavity formed by the third port and the fourth port outputs lasing light having a center wavelength which is a center wavelength to which the micro ring structure filter is currently adjusted, from the third port.

The third port transmits the set portion of the lasing light to the second PD.

Optionally, the first control circuit is specifically configured to generate an electrical signal, and control the first heater inside the micro-ring structure filter, because the heater may cause a change in the refractive index of the waveguide under different currents, thereby affecting The resonance wavelength of the microring structure filter can achieve the purpose of adjusting the center wavelength of the microring structure filter.

Optionally, the second port and the third port may integrate a branch waveguide for dividing the light into two parts of a set ratio; the first port, the second port, the third port, and the fourth The ports are respectively connected to the microring structure filter through a waveguide.

Optionally, the first and second control circuits can be implemented by a programmable device having a data processing function, such as a Field-Programmable Gate Array (FPGA), a micro control unit ( English: Micro Control Unit, referred to as: MCU).

Optionally, in order to initially align the micro ring structure filter with the center of the first signal light The wavelength can be more accurate, the branch waveguide can be integrated at the first port, and a third PD is added to the device, as shown in FIG. 4, where:

The first port is further configured to send the set portion of the first signal light to the third PD.

The third PD is configured to perform optical power detection on the set portion of the first signal light to obtain a third optical power, and send the third optical power to the first control circuit.

In the embodiment of the present invention, when the wavelength of the first signal light incident from the first port changes or drifts, the first optical power detected by the first PD at the second port is attenuated. Adjusting, by the first control circuit, the first heater inside the micro-ring structure filter, the power value of the second signal light emitted by the second port may reach a maximum value again, that is, the micro-ring structure The center wavelength of the current readjustment of the filter is again matched to the wavelength of the first signal light after the wavelength change. Thereafter, the second heater of the third port is adjusted by the second control circuit to re-align the output lasing light with the wavelength-changed first signal light. The above process performs tracking processing in real time according to changes in incident signal light, ensuring real-time alignment of the generated local oscillator light source and signal light.

In addition, the embodiment of the present invention further provides a generating device for the same frequency local oscillator light source, having a signal light incident port and a common reflective cavity port common waveguide; a plurality of devices as shown in FIG. Generating a plurality of co-frequency sources of the same frequency corresponding to signal light of a plurality of wavelengths, wherein the plurality of devices are connected to the common waveguide, sharing a signal light incident port of the common waveguide and an integrated reflective cavity port.

Referring to FIG. 5, it is a structural diagram of a multi-channel homo-frequency local oscillator light source generating device integrating four devices as shown in FIG. The A port is a signal light incident port shared by the four devices, the common waveguide is connected to the four devices, and one end of the common waveguide is integrated with a reflective cavity surface (which can be regarded as the fourth port in FIG. 3 ). Mixed with 4 different wavelengths of signal light entering from port A, this device has no The mixed signal needs to be demultiplexed, and the mixed signal light enters four devices through the branch function of the common waveguide, and then exits from the D1, D2, D3, and D4 ports of the four devices and enters from the A port. For the four local oscillators whose wavelengths are strictly aligned, the processing of the signal light by each device can be referred to the processing of the device shown in FIG.

It should be noted that if the device structure as shown in FIG. 4 is adopted, that is, the branch waveguide is integrated on the common waveguide, a part of the incident light is coupled to perform optical power detection, and according to the intensity of the filtered signal light and the incident signal light. The ratio adjusts the center wavelength of the microring structure filter. This method interferes with the wavelength of the desired wavelength due to the mixing of multiple wavelengths in the signal light of a part of the coupling, resulting in the adjustment of the center wavelength of the microring structure filter. Inaccurate, therefore, the same frequency local oscillator light source generating device integrated in the embodiment of the present invention does not adopt the structure shown in FIG.

Referring to FIG. 6, an embodiment of the present invention provides a method for generating a local frequency local oscillator light source. The implementation process of the method is as follows:

Step 601: Receive first signal light.

Step 602: Filter the first signal light by using a micro ring structure filter to obtain a second signal light.

Step 603: Coupling the set portion of the second signal light to perform optical power detection to obtain a first optical power.

Step 604: The micro ring structure filter is currently adjusted by adjusting a center wavelength of the micro ring structure filter such that the first optical power reaches a maximum value, and determining that the first optical power reaches a maximum value. The adjusted center wavelength is initially aligned with the center wavelength of the first signal light.

Alternatively, the center wavelength of the micro-loop structure filter can be adjusted by generating an electrical signal by controlling a first heater inside the micro-loop structure filter.

Step 605: Output the lasing light whose center wavelength is the center wavelength to which the micro ring structure is currently adjusted.

Step 606: Coupling the set portion of the lasing light to perform optical power detection to obtain a second optical power.

Step 607: Adjusting a center wavelength of the lasing light such that the second optical power reaches a maximum value, and determining a center at which the lasing light is currently adjusted when the second optical power reaches a maximum value. The wavelength is strictly aligned to the center wavelength of the first signal light.

Optionally, the method further includes:

Referring to FIG. 7, an embodiment of the present invention provides a device for generating a local frequency local oscillator light source, including:

The receiving unit 701 is configured to receive the first signal light.

The filtering unit 702 is configured to filter the first signal light by using a micro ring structure filter to obtain a second signal light.

The first detecting unit 703 is configured to couple the set portion of the second signal light to perform optical power detection to obtain a first optical power.

a first adjusting unit 704, configured to adjust a center wavelength of the micro ring structure filter such that the first optical power reaches a maximum value, and determine that the first optical power reaches a maximum value The center wavelength to which the structural filter is currently adjusted is initially aligned with the center wavelength of the first signal light.

The output unit 705 is configured to output lasing light whose center wavelength is a center wavelength to which the micro ring structure is currently adjusted.

The second detecting unit 706 is configured to couple the set portion of the lasing light to perform optical power detection to obtain a second optical power.

a second adjusting unit 707, configured to adjust the center wavelength of the lasing light such that the second optical power reaches a maximum value, and determine that the lasing light is currently adjusted when the second optical power reaches a maximum value The center wavelength to which it is directed is strictly aligned to the center wavelength of the first signal light.

Optionally, the first adjusting unit 704 is specifically configured to: generate an electrical signal to adjust a center wavelength of the micro ring structure filter by controlling a first heater inside the micro ring structure filter.

Optionally, the device further includes:

a third detecting unit 708, configured to couple a set portion of the first signal light to perform optical power detection The third optical power is obtained.

Correspondingly, the first adjusting unit 704 is specifically configured to adjust a center wavelength of the micro ring structure filter such that a ratio of the third optical power to the first optical power reaches a maximum value, and determines When the ratio reaches a maximum value, the center wavelength to which the microring structure filter is currently adjusted is initially aligned with the center wavelength of the first signal light.

In summary, the technical solution provided by the embodiment of the present invention achieves strict alignment of the wavelength of the signal light by the local oscillator light source by using the same micro-ring structure filter to lock the wavelength of the signal light and generate the local oscillator light source. At the same time, the local oscillator light source can track and feedback with the drift of the signal light wavelength, thereby achieving adaptive homodyne detection. Moreover, the present invention does not need to perform frequency difference tracking and optical phase lock loop (English: optical phase lock loop, OPLL for short) through the DSP, and the invention adopts a single micro ring structure device, and does not need to use a local tunable laser as the local oscillator receiving. , effectively reducing the cost of the device at the receiving end. Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the computer readable memory is stored in the computer readable memory. The instructions in the production result include an article of manufacture of the instruction device that implements the functions specified in one or more blocks of the flowchart or in a flow or block of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those skilled in the < Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the invention without departing from the spirit and scope of the embodiments of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the embodiments of the invention.

Claims

A device for generating a same frequency local oscillator light source, characterized in that

a first port, configured to receive the first signal light;

a micro ring structure filter, configured to filter the first signal light received by the first port to obtain a second signal light;

a second port, configured to send the set portion of the second signal light obtained by the micro ring structure filter to the first photodetector PD;

The first PD is configured to perform optical power detection on the set portion of the second signal light to obtain a first optical power, and send the first optical power to the first control circuit;

The first control circuit is configured to adjust a center wavelength of the micro ring structure filter until the received first optical power reaches a maximum value, and determines that the first optical power reaches a maximum value The center wavelength to which the microring structure filter is currently adjusted is initially aligned with the center wavelength of the first signal light;

a semiconductor laser for outputting a lasing light whose center wavelength is a center wavelength to which the micro ring structure filter is currently adjusted, and transmitting the set portion of the lasing light to the second PD;

The second PD is configured to perform optical power detection on the set portion of the lasing light to obtain a second optical power, and send the second optical power to the second control circuit;

The second control circuit is configured to adjust a center wavelength of the semiconductor laser until the received second optical power reaches a maximum value, and determine that the semiconductor laser is current when the second optical power reaches a maximum value The center wavelength to which it is adjusted is strictly aligned with the center wavelength of the first signal light.
The apparatus according to claim 1, wherein said first control circuit is specifically configured to generate an electrical signal to control said microring structure filtering by controlling a first heater inside said microring structure filter The center wavelength of the device.
The apparatus according to claim 1 or 2, wherein said micro ring structure filter is in said semiconductor laser, said semiconductor laser further comprising a third port and a fourth port;

Wherein, the fourth port is integrated by integrating a transflective cavity surface at the third port Reflecting the cavity surface such that the third port and the fourth port constitute a resonant cavity, and the third port integrates a second heater;

The microring structure filter locks the semiconductor laser to lasing at a center wavelength to which the wavelength of the microring structure filter is currently adjusted;

a resonant cavity formed by the third port and the fourth port, and the lasing obtained center wavelength of the lasing light whose center wavelength is currently adjusted by the micro ring structure filter is output from the third port;

The third port sends the set portion of the lasing light to the second PD;

The second heater of the third port realizes adjusting the center wavelength of the semiconductor laser by adjusting the cavity length of the resonant cavity under the control of the second PD.
The apparatus of claim 3 wherein said second port and said third port are integrated with a branch waveguide for dividing the light into two portions of a set ratio;

The first port, the second port, the third port, and the fourth port are respectively connected to the micro ring structure filter through a waveguide.
Apparatus according to any one of claims 1 to 4, wherein said first port integrates a branch waveguide, said device further comprising a third PD, wherein:

The first port is further configured to send the set portion of the first signal light to the third PD;

The third PD is configured to perform optical power detection on the set portion of the first signal light to obtain a third optical power, and send the third optical power to the first control circuit;

The first control circuit is specifically configured to adjust a center wavelength of the micro ring structure filter until a ratio of the received third optical power to the first optical power reaches a maximum value, and determines the ratio The center wavelength to which the microring structure filter is currently adjusted is initially aligned to the center wavelength of the first signal light when the maximum value is reached.
A device for generating a same frequency local oscillator light source, comprising:

a common waveguide having a signal light incident port and an integrated reflective cavity port;

A plurality of apparatus according to any one of claims 1 to 4, for respectively generating a plurality of co-frequency local oscillator sources corresponding to signal light of a plurality of wavelengths, wherein said plurality of devices and said common waveguide Connected, sharing the signal light incident port of the common waveguide and the integrated reflective cavity port.
A method for generating a local frequency local oscillator light source, comprising:

Receiving a first signal light;

The first signal light is filtered by using a micro ring structure filter to obtain a second signal light;

And coupling a set portion of the second signal light to perform optical power detection to obtain a first optical power;

Adjusting a center wavelength of the micro ring structure filter such that the first optical power reaches a maximum value, and determining that the micro ring structure filter is currently adjusted when the first optical power reaches a maximum value The center wavelength is initially aligned with a center wavelength of the first signal light;

The output center wavelength is lasing light of a central wavelength to which the microring structure is currently adjusted;

And coupling a portion of the lasing light to perform optical power detection to obtain a second optical power;

Adjusting a center wavelength of the lasing light such that the second optical power reaches a maximum value, and determining that the center wavelength of the lasing light is currently adjusted to a strict alignment when the second optical power reaches a maximum value The center wavelength of the first signal light.
The method of claim 7 wherein adjusting a center wavelength of said microring structure filter comprises:

Generating an electrical signal The central wavelength of the filter of the microring structure is adjusted by controlling a first heater inside the microring structure filter.
The method of claim 7 or 8, wherein the method further comprises:

And coupling a set portion of the first signal light to perform optical power detection to obtain a third optical power;

Adjusting a center wavelength of the micro ring structure filter such that the first optical power reaches a maximum value, and determining that the micro ring structure filter is currently adjusted when the first optical power reaches a maximum value The center wavelength is initially aligned with the center wavelength of the first signal light, including:

Adjusting a center wavelength of the micro ring structure filter such that a ratio of the third optical power to the first optical power reaches a maximum value, and determining that the ratio reaches a maximum value The center wavelength to which the current adjustment is made is initially aligned with the center wavelength of the first signal light.
A device for generating a same frequency local oscillator light source, comprising:

a receiving unit, configured to receive the first signal light;

a filtering unit, configured to filter the first signal light by using a microring structure filter to obtain Second signal light;

a first detecting unit, configured to couple a set portion of the second signal light to perform optical power detection, to obtain a first optical power;

a first adjusting unit, configured to adjust a center wavelength of the micro ring structure filter such that the first optical power reaches a maximum value, and determine that the first optical power reaches a maximum value a center wavelength to which the filter is currently adjusted is initially aligned with a center wavelength of the first signal light;

An output unit, configured to output lasing light whose center wavelength is a central wavelength to which the microring structure is currently adjusted;

a second detecting unit, configured to couple the set portion of the lasing light to perform optical power detection, to obtain a second optical power;

a second adjusting unit, configured to adjust the center wavelength of the lasing light such that the second optical power reaches a maximum value, and determine that the lasing light is currently adjusted to when the second optical power reaches a maximum value The center wavelength is strictly aligned with the center wavelength of the first signal light.
The device according to claim 10, wherein the first adjusting unit is specifically configured to:

Generating an electrical signal The central wavelength of the filter of the microring structure is adjusted by controlling a first heater inside the microring structure filter.
The device according to claim 10 or 11, wherein the device further comprises:

a third detecting unit, configured to couple the set portion of the first signal light to perform optical power detection, to obtain a third optical power;

The first adjusting unit is specifically configured to adjust a center wavelength of the micro ring structure filter such that a ratio of the third optical power to the first optical power reaches a maximum value, and determine that the ratio reaches The center wavelength to which the microring structure filter is currently adjusted is initially aligned with the center wavelength of the first signal light.