Optical signal amplification device

Abstract

The utility model discloses an optical signal amplification device, and belongs to the technical field of communication. An optical signal amplification device comprises a controller, a first pump laser, a second pump laser, a coupling module, an optical power detection module, a first operational amplifier module and a second operational amplifier module. The first pump laser and the second pump laser are both connected with the output end of the coupling module, the optical power detection module is arranged at the output end of the coupling module, the controller is electrically connected with the optical power detection module, and the optical power detection module is electrically connected with the reverse input ends of the first operational amplifier module and the second operational amplifier module. The controller is electrically connected with the positive input ends of the first operational amplifier module and the second operational amplifier module, the output end of the first operational amplifier module is electrically connected with the first pump laser, and the output end of the second operational amplifier module is electrically connected with the second pump laser. The upper limit threshold value of the maximum output optical power is increased, and meanwhile the effect of safe redundant backup is achieved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to an optical signal amplifying device. Background Art

[0002] Wireless optical communication, also known as free-space optical communication, is a communication method that uses the atmosphere as a transmission medium to transmit optical signals. This communication method has many advantages, such as high bandwidth, flexible deployment, and low cost. However, as you mentioned, it also has some challenges, especially in harsh environmental conditions, such as fog, rain, snow, etc., which can cause the attenuation of optical signals. In order to avoid the loss and delay of signals caused by converting optical signals into electrical signals and then amplifying them, EDFA (Erbium-Doped Fiber Amplifier) ​​is often used to enhance the optical signals transmitted through optical fibers.

[0003] After searching, the patent document with the existing publication number CN219801485U provides a pump protection device. The device is provided with a current detection module, a temperature detection module and a reflected light detection module. When at least one of the current, the escape temperature and the ASE back-reflected light intensity is detected to be abnormal during the operation of the pump, the pump laser will be forced to shut down, thereby effectively and comprehensively protecting the pump laser.

[0004] Although the above device can effectively protect the pump, forcibly shutting down the pump laser will affect the output power of the optical signal, resulting in a significant reduction in the reliability of the device. In view of this, we propose an optical signal amplification device. Utility Model Content

[0005] 1. Technical problems to be solved

[0006] The purpose of the present application is to provide an optical signal amplifying device to solve the problems raised in the above background technology.

[0007] 2. Technical solution

[0008] This application is implemented through the following technical solutions:

[0009] An optical signal amplifying device comprises a controller, a first pump laser, a second pump laser, a coupling module, an optical power detection module, a first operational amplifier module, and a second operational amplifier module;

[0010] The first pump laser and the second pump laser are both connected to the output end of the coupling module, the optical power detection module is arranged at the output end of the coupling module, the controller is electrically connected to the optical power detection module, the optical power detection module is electrically connected to the reverse input ends of the first operational amplifier module and the second operational amplifier module, the controller is electrically connected to the forward input ends of the first operational amplifier module and the second operational amplifier module, the output end of the first operational amplifier module is electrically connected to the first pump laser, and the output end of the second operational amplifier module is electrically connected to the second pump laser.

[0011] As an optional solution of the technical solution of the present application document, the first pump laser and the second pump laser are both controlled by independent MOS tubes, and the MOS tubes are electrically connected to the controller.

[0012] As an optional solution of the technical solution of the present application document, the optical power detection module includes a photodiode and a transimpedance amplifier, the photodiode is electrically connected to the reverse input terminal of the transimpedance amplifier, the output terminal of the transimpedance amplifier is electrically connected to the controller via an analog-to-digital converter, and the output terminal of the transimpedance amplifier is electrically connected to the reverse input terminals of the first operational amplifier module and the second operational amplifier module.

[0013] As an optional solution of the technical solution of this application document, it also includes a temperature detection module, which is used to detect the operating temperature of the first pump laser and the second pump laser, and the temperature detection module is electrically connected to the controller.

[0014] As an optional solution of the technical solution of the present application document, the temperature detection module includes a thermistor, which is integrated inside the first pump laser and the second pump laser respectively, and the thermistor is electrically connected to the controller via an analog-to-digital converter.

[0015] As an optional solution of the technical solution of the present application document, it also includes a current detection module, which is used to detect the operating current of the first pump laser and the second pump laser. The current detection module includes a sampling resistor, which is respectively connected in series with the first pump laser and the second pump laser, and the sampling resistor is electrically connected to the controller via an analog-to-digital converter.

[0016] 3. Beneficial effects

[0017] Compared with the prior art, the beneficial effects of this application are:

[0018] 1. In this application, the output light of the first pump laser and the second pump laser is combined into one optical output through a coupler, and the output light of the two power-level pump lasers is amplified through a double-clad erbium-ytterbium co-doped optical fiber to amplify the signal light. Compared with the traditional industry solution, this design increases the upper limit threshold of the maximum output optical power and plays a role in safety redundant backup.

[0019] 2. This device detects the output optical power of the pump laser through the optical power detection module. The first pump laser and the second pump laser can be independently controlled to switch through the MOS tube. Either single-way opening or dual-way opening can be selected. The output of the optical power detection module is connected to the operational amplifier module to complete the closed loop, realize automatic adjustment of the output optical power, and ensure the stability of the output optical power.

[0020] 3. The present application detects the operating status of the pump laser through a temperature detection module and a current detection module. When the operating current or operating temperature of the pump laser is too high or too low, the operation of the first pump laser or the second pump laser can be automatically shut down, thereby protecting the pump laser. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the operation flow of an optical signal amplification device;

[0022] Figure 2 The invention discloses a pump laser control circuit diagram of an optical signal amplifying device. DETAILED DESCRIPTION

[0023] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings.

[0024] See also Figure 1 and Figure 2 ,The present application provides an optical signal amplification device, including a controller, a first pump laser, a second pump laser, a coupling module, an optical power detection module, a first operational amplifier module, and a second operational amplifier module;

[0025] The first pump laser and the second pump laser are both connected to the output end of the coupling module, the optical power detection module is arranged at the output end of the coupling module, the controller is electrically connected to the optical power detection module, the optical power detection module is electrically connected to the reverse input ends of the first operational amplifier module and the second operational amplifier module, the controller is electrically connected to the forward input ends of the first operational amplifier module and the second operational amplifier module, the output end of the first operational amplifier module is electrically connected to the first pump laser, and the output end of the second operational amplifier module is electrically connected to the second pump laser.

[0026] The first pump laser and the second pump laser are both controlled by independent MOS tubes, and the MOS tubes are electrically connected to the controller.

[0027] The optical power detection module includes a photodiode and a transimpedance amplifier. The photodiode is electrically connected to the reverse input terminal of the transimpedance amplifier. The output terminal of the transimpedance amplifier is electrically connected to the controller via an analog-to-digital converter. The output terminal of the transimpedance amplifier is electrically connected to the reverse input terminals of the first operational amplifier module and the second operational amplifier module.

[0028] The device also includes a temperature detection module, which is used to detect the operating temperature of the first pump laser and the second pump laser, and is electrically connected to the controller. The temperature detection module includes a thermistor, which is integrated inside the first pump laser and the second pump laser, and is electrically connected to the controller via an analog-to-digital converter.

[0029] It also includes a current detection module, which is used to detect the operating current of the first pump laser and the second pump laser. The current detection module includes a sampling resistor, which is respectively connected in series with the first pump laser and the second pump laser, and the sampling resistor is electrically connected to the controller via an analog-to-digital converter.

[0030] Working principle:

[0031] The user sets the desired output optical power value or the choice of pump laser, and can choose single-channel opening or dual-channel opening. Taking dual-channel opening as an example, the program in the controller calculates the output voltage value of the digital-to-analog converter based on the input optical power value through the calibration parameters of the pump laser, and the voltage value of the digital-to-analog converter is sent to the forward output end of the hardware circuit op amp module; at this time, the optical signal is not amplified, and the voltage of the optical power detection module at the reverse output end of the op amp module is less than the voltage at the forward input end, so the op amp module will adjust the output voltage for output, thereby controlling the operating current of the pump laser; according to the characteristics of the op amp module, because the voltage at the forward input end is greater than the voltage at the reverse output end, the output voltage value will continue to increase, the operating current of the pump laser will also continue to increase, and the output optical power of the pump laser will increase with the continuous increase of the operating current. At this time, the photodiode current in the optical power detection module increases, and the voltage value of the output optical power through the transimpedance amplifier will also increase, until the voltage value of the forward input end of the op amp module and the negative feedback approach the same; vice versa. Ultimately, the actual output power is maintained within a small error range of the set output optical power.

[0032] If there is a problem with the first pump laser at this time, the output optical power will decrease, and the corresponding collection voltage of the optical power detection module will also decrease. At this time, the forward and reverse input voltages of the first op amp module are inconsistent. Because the main line has a problem at this time and will be damaged, the output voltage of the first op amp module increases, and the current of the main pump laser cannot increase; at this time, the second pump laser is in normal operation, and the forward input voltage of the second op amp module is greater than the reverse input voltage, so the output voltage of the second op amp module will continue to increase, and the operating current of the second pump laser will also increase, and the output optical power will inevitably increase until the output optical power voltage value collected by the optical power detection module is consistent with the optical power voltage value set in the controller. During this period, there is no need for human intervention to adjust the pump laser, and the equipment will autonomously complete the adjustment operation of the constant power of the pump laser optical signal. If the second pump laser is abnormal or damaged, the working principle and process are the same.

[0033] When the pump laser is running, the temperature detection module will collect the operating temperature of the first pump laser and the second pump laser through the thermistor, and the current detection module will collect the operating current of the first pump laser and the second pump laser through the sampling resistor; the controller determines whether the operating temperature and current of the first pump laser and the second pump laser exceed the set operating temperature threshold and operating current threshold based on the temperature and current collected by the temperature detection module and the current detection module. When the operating temperature and current of the first pump laser and the second pump laser exceed the set operating temperature threshold and / or operating current threshold, the controller disconnects the MOS tube and sets the output voltage value of the digital-to-analog converter to 0, shutting down the operation of the first pump laser or the second pump laser.

Claims

1. An optical signal amplification device, characterized in that: It includes a controller, a first pump laser, a second pump laser, a coupling module, an optical power detection module, a first operational amplifier module, and a second operational amplifier module; The first pump laser and the second pump laser are both connected to the output end of the coupling module, the optical power detection module is arranged at the output end of the coupling module, the controller is electrically connected to the optical power detection module, the optical power detection module is electrically connected to the reverse input ends of the first operational amplifier module and the second operational amplifier module, the controller is electrically connected to the forward input ends of the first operational amplifier module and the second operational amplifier module, the output end of the first operational amplifier module is electrically connected to the first pump laser, and the output end of the second operational amplifier module is electrically connected to the second pump laser.

2. The optical signal amplifying device according to claim 1, characterized in that: The first pump laser and the second pump laser are both controlled by independent MOS tubes, and the MOS tubes are electrically connected to the controller.

3. The optical signal amplifying device according to claim 1, characterized in that: The optical power detection module includes a photodiode and a transimpedance amplifier. The photodiode is electrically connected to the reverse input terminal of the transimpedance amplifier. The output terminal of the transimpedance amplifier is electrically connected to the controller via an analog-to-digital converter. The output terminal of the transimpedance amplifier is electrically connected to the reverse input terminals of the first operational amplifier module and the second operational amplifier module.

4. The optical signal amplifying device according to claim 1, characterized in that: It also includes a temperature detection module, which is used to detect the operating temperature of the first pump laser and the second pump laser, and the temperature detection module is electrically connected to the controller.

5. The optical signal amplifying device according to claim 4, characterized in that: The temperature detection module comprises a thermistor, which is integrated inside the first pump laser and the second pump laser respectively, and is electrically connected to the controller via an analog-to-digital converter.

6. The optical signal amplifying device according to claim 1, characterized in that: It also includes a current detection module, which is used to detect the operating current of the first pump laser and the second pump laser. The current detection module includes a sampling resistor, which is respectively connected in series with the first pump laser and the second pump laser, and the sampling resistor is electrically connected to the controller via an analog-to-digital converter.

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