An O-band wavelength tunable light source

Abstract

The present invention discloses an O-band wavelength tunable light source, comprising: a laser generating unit, a wavelength control unit, a unidirectional isolation unit, a spectroscopic unit, a laser power stabilization unit and an output unit. The laser generating unit is used to generate laser light, and at the same time indirectly adjusts the current value according to the feedback signal so that the output laser light is within a stable spectral range; the wavelength control unit is used to adjust the wavelength of the received laser light; the unidirectional isolation unit is used for return light isolation; the spectroscopic unit is used for spectroscopic processing and forms a ring cavity structure with the laser generating unit; the laser power stabilization unit monitors the laser power output by the spectroscopic unit to form feedback information to the laser generating unit. The present invention has high wavelength accuracy, can measure the full spectrum of the O-band, realize arbitrary wavelength adjustment and continuous scanning functions, improves the operability of the equipment and experimental efficiency; can respond in time and trigger synchronously; occupies a small space, is simple to operate, has a high cost performance, and can be applied to large-scale experiments and applications.

Description

Technical Field

[0001] The present invention relates to the field of optical communications, and in particular to an O-band wavelength tunable light source. Background Art

[0002] With the continuous increase in high-speed communications and communication data volume, various high-speed communications and sensing fields have increasingly higher technical requirements for adjustable light sources. Currently, adjustable light sources are basically concentrated in the C-band, but the C-band adjustable light source can no longer fully meet the market demand. At this time, the O-band adjustable light source with superior performance has become popular. Therefore, the industry's demand for O-band wavelength tunable light sources continues to grow, while research in this field is still shallow and the product cost is relatively high.

[0003] With the popularization and rapid development of data centers and 5G technology, the use of various devices and modules in the O-band range has increased sharply. Therefore, the demand for high-precision, high-resolution, and high-coverage photoelectric detection instruments has increased. However, the existing photoelectric detection instruments in China can only achieve certain fixed wavelength outputs, and there are few functional products similar to O-band wavelength tunable light source detection instruments. According to market research, only a small number of foreign companies monopolize the production of O-band wavelength tunable light source photoelectric detection instruments worldwide, and the prices are extremely high. The demand for this product continues to grow, resulting in a large number of manufacturers being unable to purchase and use it on a large scale. Therefore, it is urgent to develop and produce products with the same functions and that can be popularized.

[0004] Therefore, the prior art has defects and needs to be improved. Summary of the invention

[0005] The purpose of the present invention is to solve the problems that the existing light sources cannot achieve wavelength adjustment, and the wavelength accuracy and resolution are insufficient, and to provide an O-band wavelength tunable light source with a wavelength accuracy within 20pm and a wavelength adjustment resolution of at least 10pm.

[0006] The technical solution of the present invention is as follows: The present invention provides an O-band wavelength tunable light source, comprising: a laser generating unit, a wavelength control unit, a unidirectional isolation unit, a light splitting unit, a laser power stabilization unit and an output unit.

[0007] The laser generating unit is used to generate a constant current source and thus generate laser, and at the same time indirectly adjusts the current value to be within a stable range according to the feedback information of the laser power stabilizing unit, thereby making the output laser within a stable spectral range.

[0008] The wavelength control unit is connected to the laser generating unit at one end and to the unidirectional isolation unit at the other end, and is used to adjust the wavelength of the received laser and to adjust its own operating temperature.

[0009] The unidirectional isolation unit is used for returning light isolation to ensure unidirectional output of laser.

[0010] The spectroscopic unit includes a first spectroscopic module and a second spectroscopic module; the first spectroscopic module is used to receive the laser transmitted by the unidirectional isolation unit, and perform spectroscopic processing on the laser, with a part of the laser being split to the laser generating unit to form a ring cavity structure, and the other part entering the second spectroscopic module as output laser; the second spectroscopic module is used to receive the laser transmitted by the first spectroscopic module, and perform spectroscopic processing on the laser, with a part of the laser being split to the laser power stabilization unit to form the feedback information, and the other part of the laser being split as the final output laser and output through the output unit.

[0011] The laser power stabilization unit is used to monitor the power change of the laser output by the second light splitting module, form the power change into the feedback information, and control the laser generating unit to indirectly adjust the current value according to the feedback information.

[0012] Furthermore, the laser generating unit includes a laser gain module and a first temperature control module. The laser gain module is a laser amplifier, and the laser amplifier covers a spectrum in the range of 1260nm-1360nm.

[0013] Furthermore, the laser gain device is a semiconductor optical amplifier, and the laser gain device includes a base and a laser gain chip arranged on the base.

[0014] The first temperature control module uses a laser temperature control circuit composed of an IC chip and an NTC 10K thermistor to monitor and collect the temperature of the laser gain device in real time, control the cooling voltage, and thus control the cooling or heating of the cooling plate. The chip model of the first temperature control module is AD8609A.

[0015] Furthermore, the wavelength control unit includes a wavelength locking module, a wavelength selection control module, a main control module, a second temperature control module and a human-computer interaction module. The wavelength selection locking module is respectively connected to the laser generating unit, the unidirectional isolation unit and the main control module, and the second temperature control module and the human-computer interaction module are respectively connected to the main control module.

[0016] The wavelength locking module is used to lock the wavelength of the laser.

[0017] The wavelength selection control module is used to perform wavelength selection control on the laser.

[0018] The second temperature control module is used to collect the working temperature of the wavelength selection locking module and control the working temperature within a specified range.

[0019] The human-computer interaction module is used for human-computer interaction operation. After the operator sets the wavelength command, the human-computer interaction module sends the wavelength command to the main control module.

[0020] The main control module is used to receive the wavelength command sent by the human-computer interaction module and communicate with the wavelength selection locking module, and control the wavelength locking module to filter the corresponding wavelength; at the same time, receive the temperature signal sent by the second temperature control module, and determine whether the temperature signal exceeds a preset temperature range, and control the second temperature control module to adjust the temperature accordingly.

[0021] Furthermore, the wavelength locking module is a MEMS tunable optical filter.

[0022] The second temperature control module uses a MEMS temperature control circuit composed of an IC chip and an NTC 10K thermistor to monitor and collect the temperature of the MEMS tunable optical filter in real time, and controls the cooling voltage to control the cooling or heating of the cooling plate. The chip model of the second temperature control module is AD8609A.

[0023] The human-machine interchange module uses serial port communication and synchronous trigger pulses to transmit information between the computer and the wavelength tunable light source.

[0024] The chip model of the main control module is STM32.

[0025] Furthermore, the laser power stabilization unit includes a power detection module, a power feedback module and a driving module connected in sequence. The power detection module is connected to the second spectroscopic module. After detecting the change information of the laser power size, the change information is fed back to the power feedback module. The power feedback module makes corresponding commands to instruct the driving module to perform corresponding operations, which finally act on the laser generating unit.

[0026] Furthermore, the power detection module detects changes in the laser power value based on the photoelectric characteristics of the photoelectric detector.

[0027] The chip model of the power feedback module is AD8609A.

[0028] Furthermore, the optical isolation unit is an optical isolator, the first optical splitter module and the second optical splitter module are both optical couplers, and the output unit is connected by an optical fiber connector.

[0029] Furthermore, the first light splitting module is an optical path light splitting functional module.

[0030] The splitting ratio of the second splitting module is an unequal splitting module, the end with a small splitting ratio splits light to the laser power stabilization unit to form the feedback information, and the end with a large splitting ratio splits light as the final output laser and is output through the output unit.

[0031] Furthermore, the wavelength tunable light source adopts an all-optical fiber structure to achieve laser transmission between different units.

[0032] By adopting the above scheme, the wavelength accuracy of the O-band wavelength tunable light source of the present invention is high, which can reach within 20pm, and the minimum resolution can reach 10pm. The full spectrum of the O-band can be measured to realize arbitrary wavelength adjustment and continuous scanning functions, thereby improving the operability and experimental efficiency of the equipment; it can respond in time and trigger synchronously; it occupies a small space, is simple to operate, and has a high cost-effectiveness, and can be applied to large-scale experiments and applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a module block diagram of the O-band wavelength tunable light source of the present invention;

[0034] Figure 2 This is a module block diagram of an embodiment of an O-band wavelength tunable light source of the present invention;

[0035] Figure 3 It is a laser temperature control circuit in the O-band wavelength tunable light source of the present invention;

[0036] Figures 4 to 7 It is a laser constant current driving circuit in the O-band wavelength tunable light source of the present invention;

[0037] Figure 8 It is an optical power detection current circuit and a power feedback circuit in the O-band wavelength tunable light source of the present invention;

[0038] Fig. 9 It is the MEMS main control circuit in the O-band wavelength tunable light source of the present invention;

[0039] Fig. 9A for Fig. 9 A magnified view of part A;

[0040] Fig. 9B for Fig. 9 A magnified view of part B;

[0041] Fig.10 It is a MEMS temperature control circuit and a current feedback circuit in the O-band wavelength tunable light source of the present invention;

[0042] Fig.11 A power supply circuit for all MEMS control circuits in the O-band wavelength tunable light source of the present invention;

[0043] Fig.12It is a MEMS human-machine interchange communication circuit in the O-band wavelength tunable light source of the present invention;

[0044] Fig.13 and Fig.14 The invention discloses an external download upgrade version circuit in the O-band wavelength tunable light source. DETAILED DESCRIPTION

[0045] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] See also Figure 1 The present invention provides an O-band wavelength tunable light source, comprising: a laser generating unit 1, a wavelength control unit 2, a unidirectional isolation unit 3, a light splitting unit 4, a laser power stabilization unit 5 and an output unit 6. All units use an all-fiber structure for laser transmission, eliminating the difficulty of spatial light alignment, facilitating the optimization of cavity length, and compressing the laser output line width.

[0047] See also Figures 1 to 7 , the laser generating unit 1 is used to generate a constant current source to generate laser, and at the same time, according to the feedback information of the laser power stabilization unit 5, indirectly adjust the current value to be within a stable range, thereby making the output laser within a stable spectral range. The laser generating unit 1 includes a laser gain module 11 and a first temperature control module 12. The laser gain module 11 is a laser gain device. The laser gain device includes a base and a laser gain chip arranged on the base. The laser gain chip covers a spectrum in the range of 1260nm-1360nm (O-band wavelength range). Specifically, in this embodiment, the laser gain device is a semiconductor optical amplifier. The semiconductor optical amplifier chip provides broadband gain, provides amplification for the longitudinal mode that is preferably fed back by the external cavity, and can selectively provide a stable single-mode optical signal output on the other side of the chip according to different applications, such as Figures 4 to 7As shown, if the ACC mode is used, J10 is disconnected, 2-3 of J2 is short-circuited, and 1-2 is disconnected; if the APC mode is used, J10 is short-circuited, 1-2 of J2 is short-circuited, and 2-3 is disconnected; if the laser comes with a PD, J8 is short-circuited, otherwise it is not necessary, and the PD can be welded on J6. The laser amplifier is controlled by a high-precision, low-voltage input laser constant current drive circuit. The laser constant current drive circuit has the advantages of small size, low input voltage, and reliable control performance. The working principle is to generate a constant current source to control the laser amplifier 11 to generate laser, and according to the feedback signal (increase voltage or decrease voltage) transmitted by the laser power stabilization unit 5, the current is indirectly adjusted to keep the current value within a specific range, so that the laser output by the laser amplifier 11 can be guaranteed to be within a stable spectrum range, and the stability of the light source output spectrum can be improved. The laser constant current driving circuit is loaded at both ends of the laser amplifier 11 to ensure the stability of the output laser power, and the laser temperature control circuit (first temperature control module 12) is added to ensure that the laser output power will not change significantly when the laser itself is working or the external ambient temperature changes greatly. Specifically, in this embodiment, Figure 3 As shown, the first temperature control module 12 uses a laser temperature control circuit composed of a high-performance IC chip and an NTC 10K thermistor to monitor and collect the laser temperature in real time, control the cooling voltage, and thus control the cooling or heating of the cooling plate. Specifically, in this embodiment, the chip model of the first temperature control module 12 is AD8609A.

[0048] See also Figure 1 and Figure 2 The wavelength control unit 2 is connected to the laser generating unit 1 at one end and to the unidirectional isolation unit 3 at the other end, and is used to adjust the wavelength of the received laser and adjust its own working temperature at the same time. Specifically, the wavelength control unit 2 includes a wavelength locking module 21, a wavelength selection control module 25, a main control module 22, a second temperature control module 23 and a human-computer interaction module 24. The wavelength locking module 21 is respectively connected to the laser generating unit 1, the unidirectional isolation unit 3, the wavelength selection control module 25 and the main control module 22, and the second temperature control module 23 and the human-computer interaction module 24 are respectively connected to the main control module 22. The above modules together form a complete wavelength adjustment functional unit, which has the advantages of high wavelength accuracy, wide adjustable wavelength range, good wavelength repeatability, and reliable wavelength stability.

[0049] See also Figure 2 , Figures 9 to 12The wavelength locking module 21 is used to lock the wavelength of the laser. Specifically, in this embodiment, the wavelength locking module 21 is a MEMS tunable optical filter, which achieves the purpose of rapid wavelength adjustment by adjusting the driving voltage on the MEMS device. The MEMS tunable optical filter has the advantages of high precision, wavelength accuracy within 20pm, easy control, and wide adjustable spectral bandwidth. The wavelength selection control module 25 realizes the wavelength selection of the light source based on the single-chip program control technology. The second temperature control module 23 is used to collect the working temperature of the wavelength selection locking module 21 and control the working temperature within a specified range. Specifically, in this embodiment, Fig.10 As shown, the second temperature control module 23 uses a MEMS temperature control circuit composed of an IC chip and an NTC 10K thermistor to monitor and collect the temperature of the MEMS tunable optical filter in real time, and controls the cooling voltage, thereby controlling the cooling or heating of the cooling plate. Specifically, the chip model of the second temperature control module 23 in this embodiment is AD8609A. Fig.12 As shown, the human-computer interaction module 24 is used for human-computer interaction. After the operator sets the wavelength command, the human-computer interaction module 24 sends the wavelength command to the main control module 22. Specifically, in this embodiment, the human-computer interaction module 24 uses serial communication and synchronous trigger pulses to transmit information between the computer and the wavelength tunable light source to achieve communication connection between the computer and the main control module 22. Figures 9 to 9B As shown, the main control module 22 is used to receive the wavelength command sent by the human-computer interaction module 24 and communicate with the wavelength selection locking module 21, and control the wavelength selection locking module 21 to filter the corresponding wavelength; at the same time, it receives the temperature signal sent by the second temperature control module 23, and determines whether the temperature signal exceeds the preset temperature range, and controls the second temperature control module 23 to adjust the temperature accordingly. Specifically, in this embodiment, the main control module 22 adopts the main control drive board controlled by the STM32 integrated main chip, has the function of communicating and identifying with the computer, collecting temperature control feedback signals, and powering and communicating with the optical filter.

[0050] The specific working principle of the wavelength control unit 2 is: after the operator sets the wavelength command manually or using a computer, the human-computer interaction module 24 processes the information and sends it to the main control module 22, and the main control module 22 receives the wavelength command and directly communicates with the MEMS tunable optical filter to control the MEMS tunable optical filter to filter the corresponding wavelength; in addition, since the temperature has a great influence on the function of the optical filter, the high-precision second temperature control module 24 is used in this embodiment to control the temperature to ensure that the optical MEMS tunable optical filter is in a normal working state, thereby ensuring the wavelength accuracy after filtering and the wavelength repeatability and stability.

[0051] See also Figure 1 and Figure 2 The unidirectional isolation unit 3 is used for return light isolation to ensure unidirectional output of the laser, prevent excessive power from causing large return light to damage the laser gain device, and eliminate the influence of return light on laser stability. Specifically, in this embodiment, the optical isolation unit 3 is an optical isolator.

[0052] Please refer again Figure 1 and Figure 2The optical splitter unit 4 includes a first optical splitter module 41 and a second optical splitter module 42. Specifically, in this embodiment, the first optical splitter module 41 and the second optical splitter module 42 are both optical couplers. The first optical splitter module 41 is an optical path optical splitter function module, which is used to receive the laser transferred by the unidirectional isolation unit 3 and perform optical splitting processing on the laser, wherein a part of the laser is split to the laser gain module 11 in the laser generating unit 1 to form a ring cavity structure to improve the side mode suppression ratio; the other part enters the second optical splitter module 42 as the output laser. It should be noted here that other similar filtering optical paths in China use unidirectional filtering optical paths, which will result in a low side mode suppression ratio of the final output laser and the optical power failing to meet the required requirements; in the present invention, the first spectrometer module 41 is used for spectrometry, wherein a portion of the light returns to the laser gain module 11 through a closed loop, enters the wavelength control unit 2 for filtering again, and finally enters the first spectrometer module 41 again, and is finally combined with another portion of the light to be output to the second spectrometer module 42; the advantage of the closed loop is that it can make full use of the laser light energy and avoid unnecessary losses, and multiple filtering can avoid possible filtering leakage problems. In addition, the requirements for the laser are reduced, thereby indirectly saving costs, and it is a big step forward in terms of technology. The second light splitting module 42 is an unequal light splitting module, which is used to receive the laser transmitted by the first light splitting module 41, and perform light splitting feedback processing on the laser, wherein the part with a small splitting ratio is split to the laser power stabilization unit 5 to form the feedback information, and the part with a large splitting ratio is split as the final output laser through the output unit 6. The light splitting by the unequal optical coupler ensures that the output power loss is small. Specifically, in this embodiment, the output unit 6 is connected with an optical fiber connector, which can effectively reduce the optical loss.

[0053] See also Figures 1 to 3 , the laser power stabilization unit 5 includes a power detection module 51, a power feedback module 52 and a driving module 53 which are connected in sequence. The power detection module 51 is connected to the second spectroscopic module 42. After detecting the change information of the laser power size, the change information is fed back to the power feedback module 52. The power feedback module 52 makes a corresponding command to instruct the driving module 53 to make a corresponding operation, which finally acts on the laser gain module 11 in the laser generating unit 1. Specifically, in this embodiment, the power detection module 51 detects the change of the laser power value based on the photoelectric characteristics of the photodetector, and is specifically a photodetector. The power detection module 51 includes a power detection circuit, wherein the principle of the detection circuit is that the photodetector PD monitors and processes the power change of a small part of the laser separated by the second spectroscopic module 42, and then the circuit converts the power change into a voltage change. Specifically, in this embodiment, as Figure 3As shown, the power feedback module 52 is a power feedback circuit using IC chip AD8609A as the core. Its principle is to receive the voltage signal change transmitted by the power detection circuit and make corresponding feedback. For example, when the power value increases, the corresponding voltage signal increases, and the power feedback circuit makes feedback in the direction of reducing the voltage. After receiving the feedback signal transmitted by the power feedback circuit, the driving module 53 makes corresponding adjustment actions (such as increasing the voltage or decreasing the voltage), thereby controlling the laser gain module 11 in the laser generating unit 1 to adjust the corresponding current value, thereby making the laser generated by the laser gain module 11 within a stable spectral range. The laser power stabilization unit 5 is used to perform real-time power monitoring of the output laser power, and to provide real-time feedback on the power change, and dynamically adjust the current of the laser constant current drive circuit, thereby assisting in forming a closed loop to achieve high-stability laser output.

[0054] See also Figures 2 to 14 Specifically, the present invention is further described in conjunction with the embodiments. In this embodiment, the active module includes a laser gain module 11, a second temperature control module 12, a wavelength selection locking module 21, a first temperature control module 24, a driving module 53, a power feedback module 52, and a power detection module 51, and the passive module includes a unidirectional isolation unit 3, a first splitter module 41, and a second splitter unit 42. In this embodiment, it specifically includes a laser gain device, a MEMS tunable optical filter, an optical isolator, a first optical coupler, a second optical coupler, and a photodetector arranged in sequence, wherein laser transmission is performed between the components through an all-fiber structure. The specific circuit includes: a laser constant current driving circuit, a laser temperature control circuit, an optical power detection circuit and a power feedback circuit, a MEMS temperature control circuit, a MEMS main control circuit, a MEMS temperature control circuit and a current feedback circuit, a MEMS all control circuit power supply circuit, a MEMS human-machine interchange communication circuit, etc.

[0055] In summary, the O-band wavelength tunable light source of the present invention has high wavelength accuracy, which can reach within 20pm, and the minimum resolution can reach 10pm. It can measure the full spectrum of the O-band to achieve arbitrary wavelength adjustment and continuous scanning functions, thereby improving the operability of the equipment and the experimental efficiency; it can respond in time and trigger synchronously; it occupies a small space, is simple to operate, and has a high cost-effectiveness, and can be applied to large-scale experiments and applications.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An O-band wavelength tunable light source, characterized in that: include: Laser generating unit, wavelength control unit, one-way isolation unit, light splitting unit, laser power stabilization unit and output unit, The laser generating unit is used to generate a constant current source and thus generate laser, and at the same time, according to the feedback information of the laser power stabilizing unit, indirectly adjust the current value to be within a stable range, thereby making the output laser within a stable spectrum range; The wavelength control unit is connected to the laser generating unit at one end and to the unidirectional isolation unit at the other end, and is used to adjust the wavelength of the received laser and adjust its own operating temperature; The one-way isolation unit is used for returning light isolation to ensure one-way output of laser light; The optical splitter unit includes a first optical splitter module and a second optical splitter module; the first optical splitter module is used to receive the laser transmitted by the unidirectional isolation unit, perform optical splitting on the laser, a part of which is split to the laser generating unit to form a ring cavity structure, and the other part enters the second optical splitter module as an output laser; the second optical splitter module is used to receive the laser transmitted by the first optical splitter module, perform optical splitting on the laser, a part of which is split to the laser power stabilization unit to form the feedback information, and the other part of which is split as the final output laser and output through the output unit; The laser power stabilization unit is used to monitor the power change of the laser output by the second light splitting module, form the power change into the feedback information, and control the laser generating unit to indirectly adjust the current value according to the feedback information; The laser generating unit comprises a laser gain module and a first temperature control module, wherein the laser gain module is a laser amplifier, and the laser amplifier covers a spectrum ranging from 1260nm to 1360nm; The wavelength control unit includes a wavelength locking module, a wavelength selection control module, a main control module, a second temperature control module and a human-computer interaction module, wherein the wavelength locking module is respectively connected to the laser generating unit, the one-way isolation unit and the main control module, and the second temperature control module and the human-computer interaction module are respectively connected to the main control module; The wavelength locking module is used to lock the wavelength of the laser; The wavelength selection control module is used to perform wavelength selection control on the laser; The second temperature control module is used to collect the operating temperature of the wavelength selection locking module and control the operating temperature within a specified range; The human-computer interaction module is used for human-computer interaction operation. After the operator sets the wavelength command, the human-computer interaction module sends the wavelength command to the main control module; The main control module is used to receive the wavelength command sent by the human-computer interaction module and communicate with the wavelength selection locking module to control the wavelength locking module to filter the corresponding wavelength; at the same time, it receives the temperature signal sent by the second temperature control module, determines whether the temperature signal exceeds a preset temperature range, and controls the second temperature control module to adjust the temperature accordingly; The laser power stabilization unit includes a power detection module, a power feedback module and a driving module connected in sequence. The power detection module is connected to the second spectroscopic module. After detecting the change information of the laser power size, the change information is fed back to the power feedback module. The power feedback module makes a corresponding command to instruct the driving module to make a corresponding operation, which finally acts on the laser generating unit.

2. The O-band wavelength tunable light source according to claim 1, characterized in that: The laser gain device is a semiconductor optical amplifier, and the laser gain device comprises a base and a laser gain chip arranged on the base; The first temperature control module uses a laser temperature control circuit composed of an IC chip and an NTC 10K thermistor to monitor and collect the temperature of the laser gain device in real time, control the cooling voltage, and thus control the cooling or heating of the cooling plate. The chip model of the first temperature control module is AD8609A.

3. The O-band wavelength tunable light source according to claim 1, characterized in that: The wavelength locking module is a MEMS tunable optical filter; The second temperature control module uses a MEMS temperature control circuit composed of an IC chip and an NTC 10K thermistor to monitor and collect the temperature of the MEMS tunable optical filter in real time, and controls the cooling voltage, thereby controlling the cooling or heating of the cooling plate. The chip model of the second temperature control module is AD8609A; The human-computer interaction module uses serial communication and synchronous trigger pulses to transmit information between the computer and the wavelength tunable light source; The chip model of the main control module is STM32.

4. The O-band wavelength tunable light source according to claim 1, characterized in that: The power detection module detects the change of the laser power value based on the photoelectric characteristics of the photoelectric detector; The chip model of the power feedback module is AD8609A.

5. The O-band wavelength tunable light source according to claim 1, characterized in that: The optical isolation unit is an optical isolator, the first optical splitter module and the second optical splitter module are both optical couplers, and the output unit is connected by an optical fiber connector.

6. The O-band wavelength tunable light source according to claim 1 or 5, characterized in that: The first light splitting module is a light path light splitting function module; The splitting ratio of the second splitting module is an unequal splitting module, the end with a small splitting ratio splits light to the laser power stabilization unit to form the feedback information, and the end with a large splitting ratio splits light as the final output laser and is output through the output unit.

7. The O-band wavelength tunable light source according to claim 1, characterized in that: The wavelength-tunable light source adopts an all-optical fiber structure to realize laser transmission between different units.

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