Multi-gain module ultra-wide spectrum sweep frequency light source device

Abstract

The utility model relates to the technical field of optical communication, in particular to a multi-gain module ultra-wide spectrum sweep frequency light source device. The multi-gain optical fiber coupler comprises a multi-gain module, an optical device, a first optical fiber isolator, an optical fiber coupler and a second optical fiber isolator, the output end of the multi-gain module is connected with the input end of the optical device through the first optical fiber isolator, and the output end of the first optical fiber isolator is connected with the input end of the optical device. The output end of the optical device is connected with one end of the optical fiber coupler, the other end of the optical fiber coupler is connected with the input end of the second optical fiber isolator, and the output end of the second optical fiber isolator is in optical fiber connection with the input end of the multi-gain module. The optical fiber coupler acts on the optical device and forms a circulating optical path with the input end of the second optical fiber isolator and the input end of the multi-gain module. According to the utility model, the multi-gain module is introduced, so that the spectrum scanning has higher flexibility and adjustability; and an ultra-wide spectrum frequency sweeping technology is adopted, so that spectrum scanning in a larger range is realized, and the spectrum resolution is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical communication, and particularly relates to a multi-gain module ultra-wide spectrum swept light source device. Background Art

[0002] In the existing light source technology, there are some problems and limitations. Traditional fiber optic amplifiers can usually only provide limited power gain and cannot meet the requirements of high-power output. At the same time, the spectral range of traditional light sources is also limited, and it is difficult to achieve ultra-wide spectrum coverage. In addition, the slow sweeping speed is also a challenge. For applications that require rapid scanning, traditional light sources cannot meet the requirements. The existing technical solutions include traditional fiber optic amplifiers, wavelength tuners, and swept light sources, etc. Fiber optic amplifiers enhance the input optical signal through optical amplification effects, but the power gain is limited and it is difficult to achieve high-power output. Wavelength tuners use different mechanisms to adjust the wavelength of the output optical signal, but their spectral range is limited. Swept light sources can perform the sweeping operation of optical signals, but the speed is slow. Summary of the Utility Model

[0003] The utility model provides a multi-gain module ultra-wide spectrum swept light source device, aiming to solve the limitations of traditional light source technology in terms of power gain, spectral range, and sweeping speed.

[0004] The utility model provides a multi-gain module ultra-wide spectrum swept light source device, which includes a multi-gain module, an optical device, a first fiber optic isolator, a fiber optic coupler, and a second fiber optic isolator. The output end of the multi-gain module is connected to the input end of the optical device through the first fiber optic isolator. The output end of the first fiber optic isolator is connected to the input end of the optical device. The output end of the optical device is connected to one end of the fiber optic coupler. The other end of the fiber optic coupler is connected to the input end of the second fiber optic isolator. The output end of the second fiber optic isolator is fiber-connected to the input end of the multi-gain module. The fiber optic coupler acts on the optical device and forms a circulating optical path with the input end of the second fiber optic isolator and the input end of the multi-gain module.

[0005] As a further improvement of the utility model, the multi-gain module is composed of a plurality of gain units connected in series in sequence. Each gain unit includes a fiber optic amplifier, a first control circuit, and a first sensor. The first control circuit and the first sensor are connected to the corresponding fiber optic amplifier through interfaces. The fiber optic amplifier is used to set different gain values. The first control circuit monitors and adjusts the working state and parameters of the fiber optic amplifier. The first sensor is used to obtain the output parameters of the light source in real time.

[0006] As a further improvement of the present utility model, the first control circuit includes a power supply module for providing a stable current to drive the gain unit, a bias circuit for controlling the gain characteristics of the gain unit, a temperature control module for ensuring that the gain unit operates within an optimal temperature range, and a sweep control module for adjusting the drive current or bias current of the gain unit. The power supply module is respectively connected to the bias circuit, the temperature control module, and the sweep control module, and the bias circuit, the temperature control module, and the sweep control module are respectively connected to the optical fiber amplifier of the gain unit.

[0007] As a further improvement of the present utility model, the optical fiber amplifier adopts an erbium-doped fiber amplifier, and the gain value of the erbium-doped fiber amplifier is changed by adjusting the pump laser power.

[0008] As a further improvement of the present utility model, the optical fiber amplifier adopts the following structure to adjust the gain value: connecting multiple erbium-doped fiber amplifiers in series; or arranging a filter in the optical fiber amplifier link; or adjusting the coupling efficiency between the pump laser and the erbium-doped fiber.

[0009] As a further improvement of the present utility model, the optical device includes a wavelength tuner, a sweep drive circuit, and a second sensor. The wavelength tuner is used to divide the input optical signal into multiple frequency bands and send each frequency band into different gain units respectively; the wavelength tuner is connected to the multi-gain module through a first optical fiber isolator; the sweep drive circuit is used to control the wavelength tuner to perform a sweep operation and achieve wavelength tuning by changing the voltage or current, and the sweep drive circuit is connected to the wavelength tuner.

[0010] As a further improvement of the present utility model, the optical device further includes a second sensor and a feedback loop. The sweep drive circuit and the wavelength tuner are connected through the second sensor and the feedback loop. The second sensor is used to detect the wavelength of the light source output signal and output a feedback signal corresponding to the wavelength, and the feedback loop transmits the feedback signal to the sweep drive circuit.

[0011] As a further improvement of the present utility model, the feedback loop includes an amplification circuit for increasing the signal amplitude, a filtering circuit for eliminating the noise in the feedback signal, an error detection circuit for comparing the actual wavelength signal with a preset wavelength reference value, a feedback control circuit for adjusting the working state of the wavelength tuner according to the error signal, and a feedback signal interface for transmitting the feedback signal to the sweep drive circuit. The second sensor, the amplification circuit, the filtering circuit, the error detection circuit, the feedback control circuit, the feedback signal interface, and the sweep drive circuit are connected in sequence.

[0012] As a further improvement of the present utility model, the wavelength tuner adopts an optical fiber Fabry-Perot tunable filter.

[0013] As a further improvement of the present utility model, the optical fiber coupler is composed of a 2:1 end optical fiber combination. The input end of the optical fiber coupler is connected to the output end of an optical device by a single optical fiber. One optical fiber at the output end of the optical fiber coupler is connected to the input end of a second optical fiber isolator, and the other optical fiber at the output end of the optical fiber coupler serves as a signal output wiring.

[0014] The beneficial effects of the present utility model are as follows: The introduction of multiple gain modules enables the spectral scanning to have higher flexibility and adjustability. At the same time, the use of an ultra-wide spectral sweeping technology can achieve a larger range of spectral scanning and improve the spectral resolution. Description of the Drawings

[0015] Figure 1 is an overall schematic diagram of the multi-gain module ultra-wide spectral sweeping light source device of the present utility model;

[0016] Figure 2 is a schematic diagram of the structure of the multi-gain module of the multi-gain module ultra-wide spectral sweeping light source device of the present utility model.

[0017] The meanings represented by each label in the figure are as follows:

[0018] 1 - multi-gain module, 101 - optical fiber amplifier, 102 - first control circuit, 103 - first sensor, 2 - first optical fiber isolator, 3 - optical device, 301 - wavelength tuner, 302 - sweeping drive circuit, 303 - second sensor, 4 - optical fiber coupler, 5 - second optical fiber isolator. Detailed Embodiment

[0019] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] The present utility model proposes a multi-gain module ultra-wide spectral sweeping light source device. The light source utilizes a multi-gain module 1 and an ultra-wide spectral scanning technology, and can provide optical signals with high power, high stability and a wide spectral range. This device can be applied to fields such as optical communication, spectral analysis and biomedicine.

[0021] Such as Figure 1 and Figure 2As shown in the figure, specifically, a multi-gain module ultra-wide spectrum swept light source device includes a multi-gain module 1, an optical device 3, a first fiber optic isolator 2, a fiber optic coupler 4, and a second fiber optic isolator 5. The output end of the multi-gain module 1 is connected to the input end of the optical device 3 through the first fiber optic isolator 2. The output end of the first fiber optic isolator 2 is connected to the input end of the optical device 3. The output end of the optical device 3 is connected to one end of the fiber optic coupler 4. The other end of the fiber optic coupler 4 is connected to the input end of the second fiber optic isolator 5. The output end of the second fiber optic isolator is fiber-connected to the input end of the multi-gain module 1. The fiber optic coupler 4 acts on the optical device 3 and forms a circulating optical path with the input end of the second fiber optic isolator 5 and the input end of the multi-gain module 1.

[0022] The fiber optic coupler 4 is composed of a 2:1 fiber combination. One fiber at the input end of the fiber optic coupler 4 is connected to the output end of the optical device 3. One fiber at the output end of the fiber optic coupler 4 is connected to the input end of the second fiber optic isolator 5. The other fiber at the output end of the fiber optic coupler 4 serves as the signal output connection wire.

[0023] As Figure 2 shown in the figure, the multi-gain module 1 includes a plurality of gain units connected in series in sequence. Each gain unit includes a fiber amplifier 101, a first control circuit 102, and a first sensor 103. The first control circuit 102 and the first sensor 103 are connected to the corresponding fiber amplifier 101 through appropriate interfaces. The fiber amplifier 101 is used to set different gain values. The first control circuit 102 is responsible for monitoring and adjusting the working state and parameters of the fiber amplifier 101. The first sensor 103 is used to obtain the output parameters of the multi-gain module light source in real time.

[0024] The multi-gain module 1 includes a plurality of gain units (G1, G2, G3... Gn), and each gain unit has different gain characteristics. In actual implementation, appropriate gain units can be selected according to needs.

[0025] When designing the multi-gain module 1, different types of optical fiber amplifiers 101 can be selected for each gain unit, such as Erbium-Doped Fiber Amplifier (EDFA), Raman Amplifier, etc., and different gain values can be set, such as 10 dB, 20 dB, etc. The wavelength tuner 301 in the optical device 3 can adopt Micro-Electro-Mechanical Systems (MEMS) technology to tune the wavelength by changing the micro-mechanical structure. The sweep drive circuit 302 can provide an adjustable voltage or current signal as needed. The multi-gain module 1 uses the optical fiber amplifier 101 to enhance the input optical signal. The series connection of different gain units can achieve cascaded amplification, thereby obtaining a higher output power. The wavelength tuner 301 uses MEMS technology to adjust the wavelength characteristics of the optical filter through the small displacement of the micro-mechanical structure. By controlling the voltage or current signal in the sweep drive circuit 302, the sweep operation of the wavelength tuner 301 can be achieved. The control unit can monitor and adjust the working states and parameters of the optical fiber amplifier 101 and the wavelength tuner 301 through connections with the first control circuit 102 and the sweep drive circuit 302. For example, according to the output parameters obtained by the real-time sensor, the control unit can automatically adjust the gain value or the tuning range to maintain the stable performance of the multi-gain module light source.

[0026] The first sensor 103 uses a photodetector to detect the wavelength of the output optical signal in real time and transmits the feedback signal to the control unit. If the detected wavelength deviates from the preset value, the control unit will automatically adjust the parameters of the wavelength tuner 301 through the sweep drive circuit 302 to ensure that the sweep operation remains stable and maintain the stability and accuracy of the output of the multi-gain module light source.

[0027] The first control circuit 102 includes a power supply module for providing a stable current to drive the gain unit, a bias circuit for controlling the gain characteristics of the gain unit, a temperature control module for ensuring that the gain unit operates within the optimal temperature range, and a sweep control module for adjusting the drive current or bias current of the gain unit. The power supply module is respectively connected to the bias circuit, the temperature control module, and the sweep control module, and the bias circuit, the temperature control module, and the sweep control module are respectively connected to the optical fiber amplifier of the gain unit.

[0028] The structure of the first control circuit 102 consists of the following parts: a power supply module, a bias circuit, a temperature control module, and a sweep control module.

[0029] (1) Power supply module: This module provides a stable slave current to drive the gain unit (SOA). The magnitude of the current is related to the required optical amplification gain. The drive circuit uses a constant current source chip (such as LT3092) to provide a stable drive current. The magnitude of the current is adjusted according to the required optical amplification gain and is precisely controlled through an external resistor or digital interface to ensure the stable operation of the gain unit.

[0030] (2) Bias circuit: The bias circuit is used to control the gain characteristics of the gain unit. Gain adjustment is performed through a potentiometer or DAC (Digital-to-Analog Converter), or an automatic gain control (AGC) system is adopted to monitor the output optical power of the gain unit in real time and automatically adjust the bias current according to actual requirements, thereby ensuring the dynamic adjustment ability of the gain.

[0031] (3) Temperature control module: The temperature control module adopts a temperature control loop and performs feedback control of the temperature through thermoelectric cooling (TEC) and temperature sensors (such as NTC or PTC) to ensure that the gain unit operates within the optimal temperature range. The controller can select a dedicated TEC drive chip (such as MAX1968) to ensure the temperature stability of the gain unit during operation and avoid temperature drift from affecting the gain characteristics and the stability of the optical signal.

[0032] (4) Sweep control module: The sweep control module uses an FPGA (Field Programmable Gate Array) or a microcontroller (MCU) to process the wavelength tuning signal in real time. By adjusting the drive current or bias current of the gain unit, precise tuning of the frequency is achieved. The system also includes a wavelength feedback adjustment mechanism that uses a photodetector to detect the wavelength of the output optical signal in real time and feeds it back to the control unit. If the wavelength deviates from the preset value, the sweep drive circuit 302 will automatically adjust the parameters of the gain unit or the tuner to ensure the stability and consistency of the output optical signal.

[0033] The output of the power supply module is connected to the bias circuit, the temperature control module, and the sweep control module to provide them with the required power supply.

[0034] The output of the bias circuit is connected to the gain unit to provide an appropriate bias voltage or current; the bias circuit can obtain power from the power supply module. The bias circuit may receive signals from the sweep control module for dynamic adjustment.

[0035] The output of the temperature control module (such as heating or cooling signals) may affect the working environment of the gain unit. The temperature control module can also obtain power from the power supply module to support its operation. The temperature control module may monitor the temperature of the gain unit and provide feedback signals to the sweep control module as needed for appropriate adjustment.

[0036] The output of the sweep control module is connected to the gain unit to provide the required sweep drive signal. The sweep control module is also connected to the bias circuit to dynamically adjust its output. The sweep control module can obtain power from the power supply module and may receive feedback signals from the temperature control module to ensure operation under optimal conditions.

[0037] The first control circuit 102 is designed to ensure the efficient and stable operation of the multi-gain module 1 and achieve the stable output of the ultra-wide spectrum sweep light source.

[0038] In the optical fiber amplifier 101 (such as an EDFA, erbium-doped fiber amplifier 101), different gain values (such as 10 dB, 20 dB, 30 dB) can be achieved in the following two ways.

[0039] (1) Self-function adjustment of the EDFA:

[0040] The optical fiber amplifier 101 uses an erbium-doped fiber amplifier 101, and the gain value of the erbium-doped fiber amplifier 101 is changed by adjusting the pump laser power. This is the most common and direct gain adjustment method, mainly by controlling the pump laser power to achieve different gain values. The gain of the EDFA depends on the input power of the pump laser (usually a laser with a wavelength of 980 nm or 1480 nm). Specifically:

[0041] The higher the pump power, the greater the gain: The pump laser provides energy for the erbium-doped fiber, causing the erbium ions in the fiber to transition. When the signal light passes through, the erbium ions release energy to amplify the signal light.

[0042] Adjustment of the pump power: By controlling the drive current or voltage of the pump laser, the pump power can be adjusted, thereby changing the gain of the EDFA. For example:

[0043] 10 dB gain: The pump power is relatively low, and the signal light is moderately amplified;

[0044] 20 dB gain: The pump power is increased, and the signal light is further amplified;

[0045] 30 dB gain: The pump power reaches the maximum, and the signal light is significantly amplified.

[0046] (2) Structural improvement:

[0047] Although the adjustment of the pump power is the main way to achieve different gains, in some high-requirement applications, it may be possible to optimize the structural design of the optical fiber amplifier 101 to meet different gain requirements. The following are several possible structural improvements:

[0048] Multistage Amplifier Design: By cascading multiple EDFA stages, different gain levels are provided. For example, the first-stage amplifier can achieve a gain of 10 dB, and the second stage further amplifies the signal to 20 dB or 30 dB. Each stage is optimized to amplify optical signals within a specific wavelength range.

[0049] Gain Flattening Filter (GFF): By introducing a filter in the amplifier link, the gain characteristics of signals at different wavelengths are flattened, ensuring uniform gain output for multi-channel or broadband signals.

[0050] Optimization of Pump Coupling Structure: By improving the coupling efficiency between the pump laser and the erbium-doped fiber, pump energy can be used more effectively, thereby achieving higher gain output.

[0051] As Figure 1 shown, the optical device 3 includes a wavelength tuner 301, a sweep frequency drive circuit 302, and a second sensor 303. The wavelength tuner 301 is used to divide the input optical signal into multiple frequency bands and send each frequency band into different gain units respectively; the wavelength tuner 301 is connected to the multi-gain module 1 through a first optical fiber isolator 2; the function of the first optical fiber isolator 2 is to couple the output optical signal of the multi-gain module 1 into the wavelength tuner 301; the sweep frequency drive circuit 302 is used to control the wavelength tuner 301 to perform a sweep frequency operation and achieve wavelength tuning by changing the voltage or current. The sweep frequency drive circuit 302 is connected to the wavelength tuner 301 through an appropriate interface.

[0052] The first optical fiber isolator 2 is used to ensure the effective transmission of optical signals and perform a sweep frequency operation through the wavelength tuner 301. After connection, the connection part is calibrated and tested to ensure the smooth transmission of optical signals and the normal operation of the wavelength tuner 301. The first control circuit 102 is used to control the working state of the gain unit to achieve sweep frequency of optical signals; the sweep frequency drive circuit 302 monitors the output parameters of the wavelength tuner 301 in real time and automatically adjusts it as needed to maintain the stable performance of the light source.

[0053] The sweep frequency drive circuit 302 is connected to the wavelength tuner 301 through an appropriate interface. This interface is used to achieve signal transmission, enabling the control unit to communicate with the wavelength tuner 301 and instruct it to perform wavelength tuning operations. The interface can adopt a high-speed digital or analog signal interface to ensure the accuracy and fast response of wavelength tuning. By changing the voltage or current, the sweep frequency drive circuit 302 adjusts the wavelength tuner 301. This module can control the tuning rate and range of the tuner to achieve precise control of the sweep frequency operation. The change in voltage or current directly affects the wavelength tuning effect, thereby changing the frequency of the optical signal to achieve the required sweep frequency function.

[0054] The sweep drive circuit 302 includes a wavelength feedback adjustment module, which uses a photodetector to detect the wavelength of the output optical signal in real time and transmits the feedback signal to the control unit. If the detected wavelength deviates from the preset value, the control unit automatically adjusts the parameters of the wavelength tuner 301 through the sweep drive circuit 302 to ensure the stability of the sweep operation and maintain the stability and accuracy of the light source output.

[0055] The optical device 3 further includes a second sensor 303 and a feedback loop. The sweep drive circuit 302 and the wavelength tuner 301 are connected through the second sensor 303 and the feedback loop. The second sensor 303 is used to detect the wavelength of the light source output signal and output a feedback signal corresponding to the wavelength, and the feedback loop transmits the feedback signal to the sweep drive circuit 302.

[0056] The second sensor 303 uses the same photodetector (such as a photodiode or a photomultiplier tube) as the first sensor 103 to detect the wavelength of the light source output signal. The detector converts the received optical signal into an electrical signal and outputs a voltage or current signal corresponding to the wavelength. This signal is transmitted to the control unit as feedback information.

[0057] The feedback loop includes an amplifier circuit for increasing the signal amplitude, a filter circuit for eliminating noise in the feedback signal, an error detection circuit for comparing the actual wavelength signal with the preset wavelength reference value, a feedback control circuit for adjusting the working state of the wavelength tuner 301 according to the error signal, and a feedback signal interface for transmitting the feedback signal to the sweep drive circuit 302. The second sensor 303, the amplifier circuit, the filter circuit, the error detection circuit, the feedback control circuit, the feedback signal interface, and the sweep drive circuit 302 are connected in sequence.

[0058] The core function of the feedback loop is to automatically adjust the parameters of the wavelength tuner 301 by transmitting the feedback signal to the sweep drive circuit 302 through real-time monitoring of wavelength changes. The specific structure is as follows:

[0059] (1) Second sensor 303 (wavelength detection module): The second sensor 303 is generally a photodetector (such as a photodiode or a photomultiplier tube) for detecting the wavelength of the light source output signal. The detector converts the received optical signal into an electrical signal and outputs a voltage or current signal corresponding to the wavelength. This signal is transmitted to the control unit as feedback information.

[0060] (2) Amplifier circuit: To ensure that the strength of the feedback signal is sufficient and can be processed, an amplifier circuit is usually connected after the second sensor 303. The amplifier circuit is used to increase the amplitude of the signal so that the subsequent processing module can accurately interpret the wavelength deviation information. This amplifier circuit can be designed using an operational amplifier, and the output signal is adjusted to a range suitable for processing by the sweep drive circuit 302.

[0061] (3) Filtering circuit: The filtering circuit is used to eliminate the noise in the feedback signal and ensure the stability and reliability of the feedback signal. A low-pass filter is usually used to suppress high-frequency noise, thereby improving the wavelength tuning accuracy. The design of the filter can be adjusted according to the actual noise level and the system response speed to achieve the best feedback effect.

[0062] (4) Error detection circuit: After the feedback signal is filtered and amplified, it enters the error detection circuit, which compares the actual wavelength signal with a preset wavelength reference value. The result output by the error detection circuit is a wavelength deviation signal, which is used to represent the difference between the current output wavelength and the target wavelength.

[0063] (5) Feedback control circuit: The feedback control circuit is responsible for adjusting the working state of the wavelength tuner 301 according to the error signal. This control circuit can use a PID (Proportional-Integral-Derivative) controller to calculate the wavelength deviation in real time and output a control signal to the voltage / current regulation module to adjust the drive voltage or current of the wavelength tuner 301. Through this process, the control system can dynamically adjust the wavelength to bring it back to the target range.

[0064] (6) Feedback signal interface: The feedback signal interface transmits the feedback signal to the control unit in the sweep drive circuit 302, and the control unit adjusts the sweep operation in real time according to the feedback signal to ensure the accuracy of wavelength tuning.

[0065] Overall closed-loop working principle of the feedback loop:

[0066] The feedback loop monitors the wavelength output through the second sensor 303 and forms a closed-loop control through the processes of signal conditioning, error detection, and controller adjustment. The entire feedback circuit ensures that the wavelength of the optical signal remains stable during operation. If a deviation from the target value is detected, the feedback circuit adjusts the current or voltage of the wavelength tuner 301 to achieve automatic adjustment.

[0067] The wavelength tuner 301 uses a fiber Fabry-Perot tunable filter. The wavelength tuner 301 adjusts the change of the air cavity through the air cavity and uses an electro-driven microelectromechanical structure (MEMS). The improvement of the microelectromechanical structure in this device is usually related to how to control the physical size change of the air cavity more precisely and flexibly in order to achieve a wider and controllable wavelength tuning range.

[0068] Improvements in micromechanical structures involve the following aspects:

[0069] (1) Precise control of the length of the air cavity: Micromechanical structures may use more sophisticated electrically driven mechanical components (such as microactuators) so that the length change of the air cavity can respond more accurately to the input signal, thereby achieving fine tuning of the wavelength of the light source.

[0070] (2) Improvement of response speed and tuning range: By improving MEMS design, it is possible to increase the tuning speed, make the wavelength sweep range wider, and adjust the frequency higher. For example, optimizing the elastic coefficient of the robot arm or adjusting the control accuracy of the electric drive voltage can achieve faster and more stable air cavity changes.

[0071] (3) Stability and thermal effect control: Improvements in micromechanical structures may also include improving the device's tolerance to temperature changes and vibrations. When the air cavity is affected by ambient temperature, its length may change slightly, which is not conducive to the stability of the wavelength. Therefore, improving micromechanical design to reduce the impact of thermal effects is a major challenge.

[0072] The utility model discloses a method for developing a multi-gain module ultra-wide spectrum swept frequency light source device, comprising the following steps:

[0073] a) designing a multi-gain module 1, the module is composed of a plurality of gain units, each gain unit having different gain characteristics;

[0074] b) preparing an ultra-wide spectrum swept frequency light source, using an optical device 3 to divide the input optical signal into multiple frequency bands, and sending each frequency band to a different gain unit;

[0075] c) Perform spectrum scanning, control the gain of different frequency bands by changing the working state of the gain unit, and realize frequency scanning of the optical signal.

[0076] The following is a specific embodiment described by a model to explain the working principle between the multi-gain module 1, the wavelength tuner 301 and the control unit.

[0077] Multi-gain module 1: A multi-gain module 1 consisting of three gain units is designed. Each gain unit includes a fiber amplifier 101 and a corresponding first control circuit 102 and a first sensor 103. The fiber amplifier 101 can use EDFA and set different gain values, such as 10 dB, 20 dB and 30 dB. The first control circuit 102 is connected to the corresponding first sensor 103 through an appropriate interface to monitor and adjust the fiber amplifier 101.

[0078] Wavelength Tuner 301: A wavelength tuner 301 with a micro - mechanical structure is designed using MEMS technology. This wavelength tuner 301 adjusts the wavelength characteristics of the optical filter through minute displacements. The sweep - frequency driving circuit 302 provides an adjustable voltage or current signal for controlling the sweep - frequency operation of the wavelength tuner 301.

[0079] Control Unit Module: A control unit module is designed to monitor and adjust the operating states and parameters of the multi - gain module 1 and the wavelength tuner 301. The control unit is connected to the first control circuit 102 and the sweep - frequency driving circuit 302 to achieve control over the gain unit and the wavelength tuner 301. The sweep - frequency driving circuit 302 monitors the output parameters of the wavelength tuner 301 in real - time through the second sensor 303 and the feedback loop, and automatically adjusts it as needed.

[0080] Through the above - mentioned model, the following operations can be achieved:

[0081] 1) The control unit obtains the output parameters of the multi - gain module 1, such as optical power and gain value, by monitoring the first sensor 103.

[0082] 2) According to the output parameters obtained by the real - time sensor, the control unit can automatically adjust the gain value or other parameters in the first control circuit 102 to maintain the stable performance of the light source.

[0083] 3) The voltage or current signal provided by the sweep - frequency driving circuit 302 controls the micro - mechanical structure of the wavelength tuner 301 to achieve wavelength tuning and sweep - frequency operations.

[0084] The present utility model designs a light source that can provide high - power output, has an ultra - wide spectral range, and a fast sweep - frequency speed. By using the multi - gain module 1 to cascade - amplify the input optical signal, high - power output can be achieved. By adopting a wavelength tuner 301 based on MEMS technology, the wavelength characteristics of the optical filter can be adjusted to achieve coverage of an ultra - wide spectral range. The control unit is connected to the multi - gain module 1 and the wavelength tuner 301, and can monitor and adjust their operating states and parameters in real - time to maintain the stable performance of the light source.

[0085] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A multi-gain module ultra-wide spectral sweep light source device, characterized in that, It includes a multi-gain module, an optical device, a first optical fiber isolator, an optical fiber coupler, and a second optical fiber isolator. The output end of the multi-gain module is connected to the input end of the optical device through the first optical fiber isolator. The output end of the first optical fiber isolator is connected to the input end of the optical device. The output end of the optical device is connected to one end of the optical fiber coupler. The other end of the optical fiber coupler is connected to the input end of the second optical fiber isolator. The output end of the second optical fiber isolator is fiber-connected to the input end of the multi-gain module. The optical fiber coupler acts on the optical device and forms a circular optical path with the input end of the second optical fiber isolator and the input end of the multi-gain module.

2. The multi-gain module ultra-wide spectrum swept light source device according to claim 1, characterized in that, The multi-gain module is composed of multiple gain units connected in series in sequence. Each gain unit includes an optical fiber amplifier, a first control circuit, and a first sensor. The first control circuit and the first sensor are connected to the corresponding optical fiber amplifier through interfaces. The optical fiber amplifier is used to set different gain values. The first control circuit monitors and adjusts the working state and parameters of the optical fiber amplifier. The first sensor is used to obtain the output parameters of the light source in real time.

3. The multi-gain module ultra-wide spectral sweep light source device according to claim 2, wherein The first control circuit includes a power supply module for providing a stable current to drive the gain unit, a bias circuit for controlling the gain characteristics of the gain unit, a temperature control module for ensuring that the gain unit operates within the optimal temperature range, and a sweep control module for adjusting the drive current or bias current of the gain unit. The power supply module is respectively connected to the bias circuit, the temperature control module, and the sweep control module. The bias circuit, the temperature control module, and the sweep control module are respectively connected to the optical fiber amplifier of the gain unit.

4. The multi-gain module ultra-wide spectrum swept light source device according to claim 2, wherein The optical fiber amplifier adopts an erbium-doped optical fiber amplifier, and the gain value of the erbium-doped optical fiber amplifier is changed by adjusting the pump laser power.

5. The multi-gain module ultra-wide spectral sweep light source device according to claim 2, wherein The optical fiber amplifier adopts the following structures to adjust the gain value: connecting multiple erbium-doped optical fiber amplifiers in series; or setting a filter in the optical fiber amplifier link; or adjusting the coupling efficiency between the pump laser and the erbium-doped optical fiber.

6. The multi-gain-module ultra-wide spectral sweep light source device according to claim 1, characterized in that, The optical device includes a wavelength tuner, a sweep drive circuit, and a second sensor. The wavelength tuner is used to divide the input optical signal into multiple frequency bands and send each frequency band into different gain units respectively. The wavelength tuner is connected to the multi-gain module through the first optical fiber isolator. The sweep drive circuit is used to control the wavelength tuner to perform a sweep operation and achieve wavelength tuning by changing the voltage or current. The sweep drive circuit is connected to the wavelength tuner.

7. The multi-gain-module ultra-wide spectral sweep light source device according to claim 6, characterized in that, The optical device also includes a second sensor and a feedback loop. The sweep drive circuit and the wavelength tuner are connected through the second sensor and the feedback loop. The second sensor is used to detect the wavelength of the light source output signal and output a feedback signal corresponding to the wavelength. The feedback loop transmits the feedback signal to the sweep drive circuit.

8. The multi-gain module ultra-wide spectral sweep light source device according to claim 7, characterized in that, The feedback loop includes an amplifying circuit for increasing the signal amplitude, a filtering circuit for eliminating noise in the feedback signal, an error detection circuit for comparing the actual wavelength signal with a preset wavelength reference value, a feedback control circuit for adjusting the operating state of the wavelength tuner according to the error signal, and a feedback signal interface for transmitting the feedback signal to the sweep driving circuit. The second sensor, the amplifying circuit, the filtering circuit, the error detection circuit, the feedback control circuit, the feedback signal interface, and the sweep driving circuit are connected in sequence.

9. The multi-gain module ultra-wide spectral sweep light source device according to claim 6, wherein The wavelength tuner uses a fiber Fabry-Perot tunable filter.

10. The multi-gain module ultra-wide spectrum swept light source device according to claim 1, characterized in that, The fiber coupler is composed of a 2:1 fiber combination. The input end of the fiber coupler is connected to the output end of the optical device by one fiber. One fiber at the output end of the fiber coupler is connected to the input end of the second optical fiber isolator, and the other fiber at the output end of the fiber coupler serves as the signal output connection wire.

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