Dual-axis dual-wavelength polarization-maintaining ultrahigh-power optical fiber amplifier

Abstract

The utility model relates to the technical field of optical fiber communication and laser, in particular to a double-shaft double-wavelength polarization-maintaining ultrahigh-power optical fiber amplifier, which comprises a polarization-maintaining beam splitter, a polarization-maintaining wavelength division multiplexer, a polarization-maintaining doped fiber, a polarization-maintaining beam combiner, a double-cladding polarization-maintaining optical fiber and a polarization-maintaining coupler, the other side of the polarization-maintaining wavelength division multiplexer is in optical fiber connection with a polarization-maintaining doped fiber, the other side of the polarization-maintaining doped fiber is connected with a polarization-maintaining beam combiner, the other side of the polarization-maintaining beam combiner is connected with a double-cladding polarization-maintaining optical fiber, and the other side of the double-cladding polarization-maintaining optical fiber is in optical fiber connection with a polarization-maintaining coupler; according to the utility model, stable and high-power output can be realized on two different spectral wavelengths at the same time, the polarization state of signal light is kept unchanged, the signal quality and the system performance in an optical communication system and industrial laser application are remarkably improved, the dual-wavelength high-power output and the polarization maintaining performance are realized, and the application range is wide. And the reliability and efficiency of the system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of optical fiber communication and laser technology, especially to double -axis double -wavelength polarization maintaining ultra -high power optical fiber amplifier. BACKGROUND

[0002] Optical fiber amplifier is a kind of equipment using stimulated emission principle in optical fiber material to amplify optical signal.It does not need to convert optical signal into electric signal, but directly amplifies optical power in optical fiber, thereby prolongs the transmission distance of optical fiber communication system and improves signal quality.

[0003] But traditional optical fiber amplifier faces signal polarization maintaining and stability problem when processing double -wavelength signal, especially under high -power condition, polarization mode dispersion (PMD) caused by nonlinear optical effect and thermal effect seriously interferes signal quality, and reduces the reliability and efficiency of system.

[0004] Therefore, aiming at the above-mentioned optical fiber amplifier can seriously interfere with signal quality, double -axis double -wavelength polarization maintaining ultra -high power optical fiber amplifier can be designed, and stable and high -power output is realized on two different spectral wavelengths, and the polarization state of signal light is kept unchanged. INVENTION CONTENTS

[0005] In order to overcome the problem that polarization mode dispersion caused by nonlinear optical effect and thermal effect of optical fiber amplifier seriously interferes signal quality and reduces the reliability and efficiency of system.

[0006] The technical scheme of the utility model is: double -axis double -wavelength polarization maintaining ultra -high power optical fiber amplifier, including polarization maintaining beam splitter, polarization maintaining wavelength division multiplexer, polarization maintaining doped fiber, polarization maintaining beam combiner, double -cladding polarization maintaining optical fiber and polarization maintaining coupler, polarization maintaining wavelength division multiplexer is connected to the polarization maintaining beam splitter side optical fiber, polarization maintaining doped fiber is connected to the polarization maintaining wavelength division multiplexer other side optical fiber, polarization maintaining doped fiber other side and polarization maintaining beam combiner are interconnected, polarization maintaining beam combiner other side and double -cladding polarization maintaining optical fiber are interconnected, polarization maintaining coupler is connected to the double -cladding polarization maintaining optical fiber other side optical fiber.

[0007] Preferably, stable and high -power output can be realized on two different spectral wavelengths, and the polarization state of signal light is kept unchanged, signal quality and system performance in optical communication system and industrial laser application are significantly improved, double -wavelength high -power output and polarization maintaining performance are realized, and the reliability and efficiency of system are improved.

[0008] As preferred, the polarization maintaining beam splitter optical fiber is connected with a first photoelectric detector, the polarization maintaining wavelength division multiplexer side optical fiber is connected with a first pump laser, the polarization maintaining beam combiner side optical fiber is connected with a second pump laser, the double -cladding polarization maintaining optical fiber side is provided with a heat dissipation control system, and the polarization maintaining coupler side optical fiber is connected with a second photoelectric detector.

[0009] As preferred, the first photodetector and the second photodetector are of the same type, and the first pump laser and the second pump laser are of the same type.

[0010] As preferred, the optical fiber uses Yb+ / Er+ co-doped high-power polarization maintaining fiber.

[0011] As preferred, the first pump laser and the second pump laser use high-power lasers.

[0012] As preferred, the heat dissipation control system designs an air cooling circulation system and uses high-efficiency heat-conducting silicone grease.

[0013] As preferred, the optical fiber uses double-clad polarization maintaining fiber with high refractive index as the gain medium.

[0014] The utility model discloses the beneficial effect:

[0015] 1, this new type can realize stable and high-power output on two different spectral wavelengths simultaneously, and keep the polarization state of signal light unchanged, significantly improve the signal quality and system performance in optical communication system and industrial laser application, realize double-wavelength high-power output and polarization maintaining performance, improve the reliability and efficiency of system. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The overall structure schematic diagram of the utility model is shown.

[0017] Mark explanation: 1, polarization maintaining beam splitter, 2, polarization maintaining wavelength division multiplexer, 3, first pump laser, 4, polarization maintaining doped fiber, 5, second pump laser, 6, polarization maintaining beam combiner, 7, double-clad polarization maintaining fiber, 8, heat dissipation control system, 9, polarization maintaining coupler, 10, first photodetector, 11, second photodetector. DETAILED DESCRIPTION

[0018] The utility model is further explained in connection with the drawings and examples.

[0019] A fiber amplifier is a device that uses the principle of stimulated emission in optical fiber material to amplify optical signals. It does not need to convert optical signals into electrical signals, but directly amplifies optical power in optical fiber, thereby prolonging the transmission distance of optical fiber communication system and improving signal quality. The role is signal amplification: increase the power of optical signals to compensate for signal attenuation caused by distance increase during optical fiber transmission. Transmission distance extension: enables optical fiber communication system to cover longer distances without the need for signal regeneration. Bandwidth preservation: optical fiber amplifiers generally have less impact on signal nonlinearity, which can maintain signal bandwidth. Importance: The importance of fiber amplifiers to optical fiber communication systems is reflected in: improving communication efficiency: by reducing signal attenuation, it improves the efficiency of the communication system. Reduce costs: reduce the use of repeaters, reduce system construction and maintenance costs. Increase network capacity: support higher data transmission rates to meet growing communication needs. Problems encountered during use: nonlinear distortion: under strong optical power, fiber amplifiers may produce nonlinear distortion, affecting signal quality. Noise: fiber amplifiers may introduce noise, reducing signal-to-noise ratio. Gain saturation: when the input optical power exceeds a certain threshold, the gain of the amplifier will saturate and no longer increase with the increase in input power. Cost and maintenance: high-end fiber amplifiers are expensive and require regular maintenance. The technical background of fiber amplifiers mainly includes: optical fiber technology: the development of optical fiber as a signal transmission medium has promoted the application of fiber amplifiers. Laser technology: the advancement of laser technology as the light source of fiber amplifiers has improved the performance of the amplifiers. Optical communication technology: the development of optical communication technology has driven the demand for fiber amplifiers. High-power amplification: fiber amplifiers can provide high-power optical signal amplification to meet the needs of long-distance transmission. Wide bandwidth: fiber amplifiers can amplify wide-band optical signals to support high data transmission rates. All-optical amplification: fiber amplifiers are an important part of all-optical communication systems, eliminating the need for optical-electrical conversion, simplifying system structure. Low loss: fiber amplifiers have low loss, which can effectively compensate for signal attenuation during fiber transmission. The working principle of fiber amplifiers is based on stimulated emission in optical fiber. When signal light passes through optical fiber doped with rare earth elements (such as erbium, praseodymium, thulium, etc.), these elements absorb the energy of the pump light source and emit photons of the same frequency, thereby amplifying the signal light. The pump light source is usually provided by a laser, and its wavelength and power are carefully designed to ensure the performance and stability of the amplifier. Compared with existing devices, the advantages are: no electro-optical conversion: compared with traditional electro-optical amplifiers, fiber amplifiers do not need to convert optical signals into electrical signals and then back into optical signals, simplifying the system structure and improving efficiency. Low insertion loss: the insertion loss of fiber amplifiers is low, and the impact on signals is small. Easy to integrate: fiber amplifiers are easy to integrate into optical fiber communication systems without the need for additional interfaces and adapters. Long-term stability: fiber amplifiers have high long-term working stability and can operate in harsh environments for a long time.

[0020] Please refer to Figure 1 The utility model provides a kind of embodiment: dual-axial dual-wavelength polarization maintaining ultra-high power fiber amplifier, including polarization maintaining beam splitter 1, further including polarization maintaining wavelength division multiplexer 2, polarization maintaining doped fiber 4, polarization maintaining combiner 6, double-clad polarization maintaining fiber 7 and polarization maintaining coupler 9, polarization maintaining wavelength division multiplexer 2 is connected with polarization maintaining doped fiber 4 on the one side optical fiber of polarization maintaining beam splitter 1, polarization maintaining doped fiber 4 is connected with polarization maintaining combiner 6 on the other side, polarization maintaining combiner 6 is connected with double-clad polarization maintaining fiber 7 on the other side, double-clad polarization maintaining fiber 7 is connected with polarization maintaining coupler 9 on the other side optical fiber, it can be simultaneously realized on two different spectral wavelengths Stable and high-power output, while keeping the polarization state of signal light unchanged, significantly improve signal quality and system performance in optical communication system and industrial laser application, realize dual-wavelength high-power output and polarization maintaining performance, improve the reliability and efficiency of system.

[0021] Please refer to Figure 1 In the embodiment, first photodetector 10 is connected with polarization maintaining beam splitter 1 optical fiber, first pump laser 3 is connected with polarization maintaining wavelength division multiplexer 2 one side optical fiber, second pump laser 5 is connected with polarization maintaining combiner 6 one side optical fiber, double-clad polarization maintaining fiber 7 one side is provided with heat dissipation control system 8, second photodetector 11 is connected with polarization maintaining coupler 9 one side optical fiber, first photodetector 10 and second photodetector 11 are same type, first pump laser 3 and second pump laser 5 are same type, optical fiber uses Yb3+ / Er3+ co-doped high-power polarization maintaining fiber, first pump laser 3 and second pump laser 5 adopt high-power laser, heat dissipation control system 8 designs air cooling circulation system, and high-efficiency heat-conducting silicone grease is used, optical fiber uses double-clad polarization maintaining fiber 7 with high refractive index as gain medium, dual-wavelength light source is connected with polarization maintaining beam splitter 1 and polarization maintaining wavelength division multiplexer 2 through optical fiber, first pump laser 3 is connected with polarization maintaining wavelength division multiplexer 2 other end through optical fiber, and carries out signal amplification once through polarization maintaining doped fiber 4, second pump laser 5 polarization maintaining combiner 6 and double-clad polarization maintaining fiber 7 carry out secondary power amplification, realize high-efficiency energy conversion, and the temperature of fiber amplifier is maintained in the range of ±0.1 DEG C through heat dissipation control system 8 to double-clad polarization maintaining fiber 7 for heat dissipation treatment, ensure the long-term stability and reliability of system, finally through polarization maintaining coupler 9 and first photodetector 10 and second photodetector 11 and microprocessor, the power of signal light is monitored in real time, and pump power is adjusted through PID controller, ensure output power stability.

[0022] In the process of work, the dual-wavelength light source is connected with the polarization maintaining beam splitter 1 and the polarization maintaining wavelength division multiplexer 2 through optical fiber, the first pump laser 3 is connected with the other end of the polarization maintaining wavelength division multiplexer 2 through optical fiber, and the first signal amplification is carried out through the polarization maintaining doped fiber 4, the second pump laser 5, the polarization maintaining beam combiner 6 and the double-clad polarization maintaining optical fiber 7 carry out the second power amplification, realize the high efficiency energy conversion, at the same time, the double-clad polarization maintaining optical fiber 7 is cooled through the heat dissipation control system 8, and the temperature of the optical fiber amplifier is maintained in the range of ±0.1℃, which ensures the long-term stability and reliability of the system, finally, the polarization maintaining coupler 9, the first photoelectric detector 10, the second photoelectric detector 11 and the microprocessor are used to monitor the power of the signal light in real time, and the PID controller is used to adjust the pump power, so as to ensure the stability of the output power.

[0023] Through the above steps, stable and high-power output can be realized at two different spectral wavelengths at the same time, and the polarization state of the signal light is kept unchanged, which significantly improves the signal quality and system performance in optical communication systems and industrial laser applications, realizes the dual-wavelength high-power output and polarization maintaining performance, and improves the reliability and efficiency of the system.

Claims

1. A dual-axis, dual-wavelength polarization-maintaining ultra-high power fiber amplifier, comprising a polarization-maintaining beam splitter (1); characterized in that: It also includes a polarization-maintaining wavelength division multiplexer (2), a polarization-maintaining doped fiber (4), a polarization-maintaining combiner (6), a double-clad polarization-maintaining fiber (7), and a polarization-maintaining coupler (9). One side of the polarization-maintaining combiner (1) is connected to the polarization-maintaining wavelength division multiplexer (2), and the other side of the polarization-maintaining wavelength division multiplexer (2) is connected to the polarization-maintaining doped fiber (4). The other side of the polarization-maintaining doped fiber (4) is connected to the polarization-maintaining combiner (6), and the other side of the polarization-maintaining combiner (6) is connected to the double-clad polarization-maintaining fiber (7). The other side of the double-clad polarization-maintaining fiber (7) is connected to the polarization-maintaining coupler (9).

2. The dual-axis, dual-wavelength polarization-maintaining ultra-high power fiber amplifier according to claim 1, characterized in that: The polarization-maintaining beam splitter (1) is connected to a first photodetector (10) by an optical fiber, the polarization-maintaining wavelength division multiplexer (2) is connected to a first pump laser (3) by an optical fiber on one side, the polarization-maintaining beam combiner (6) is connected to a second pump laser (5) by an optical fiber on one side, the double-clad polarization-maintaining fiber (7) is equipped with a heat dissipation control system (8) on one side, and the polarization-maintaining coupler (9) is connected to a second photodetector (11) by an optical fiber on one side.

3. The dual-axis, dual-wavelength polarization-maintaining ultra-high power fiber amplifier according to claim 2, characterized in that: The first photodetector (10) and the second photodetector (11) are of the same type, and the first pump laser (3) and the second pump laser (5) are of the same type.

4. The dual-axis, dual-wavelength polarization-maintaining ultra-high power fiber amplifier according to claim 3, characterized in that: The optical fiber used is a high-power polarization-maintaining fiber co-doped with Yb3+ / Er3+.

5. The dual-axis, dual-wavelength polarization-maintaining ultra-high power fiber amplifier according to claim 4, characterized in that: The first pump laser (3) and the second pump laser (5) are high-power lasers.

6. The dual-axis, dual-wavelength polarization-maintaining ultra-high power fiber amplifier according to claim 1, characterized in that: The heat dissipation control system (8) is designed with an air-cooled circulation system and uses high-efficiency thermal grease.

7. The dual-axis, dual-wavelength polarization-maintaining ultra-high power fiber amplifier according to claim 6, characterized in that: The optical fiber uses a double-clad polarization-maintaining fiber (7) with a high refractive index as the gain medium.

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