A low-noise high-gain 1550nm single-frequency fiber amplifier

By employing a single-pump, dual-stage, dual-channel master oscillation power amplifier structure and a forward pumping design in a space laser communication system, and optimizing the parameters of erbium-doped fiber, the problems of high signal loss and high bit error rate in existing fiber amplifiers during long-distance transmission are solved. This results in a high-gain, low-noise fiber amplifier suitable for space laser communication and other applications.

CN117293630BActive Publication Date: 2025-11-07NANJING INST OF ADVANCED LASER TECH +1
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Patent Information

Application Number
CN202311273960.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-09-28
Publication Date
2025-11-07
Estimated Expiration
2043-09-28

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Abstract

The application discloses a low-noise high-gain 1550nm single-frequency optical fiber amplifier, which comprises an input end cap, a tap isolator, a preamplifier and a power amplifier; the input end cap is connected with one end of the tap isolator and is used for monitoring the power and spectrum of a signal and preventing the preamplifier from returning light in the 1.5mu m wave band; the other end of the tap isolator is connected with the preamplifier; the preamplifier is connected with one end of a first tap band-pass isolator in sequence and is used for filtering out broadband ASE and monitoring the preamplifier output through the first tap band-pass isolator; the other end of the first tap band-pass isolator is connected with the power amplifier; compared with the prior art, the single-pump double-stage double-channel master oscillator power amplifier structure is adopted in the application, the tap band-pass isolator and the polarization beam splitter are combined to replace the conventional Faraday reflector in the power amplification stage, and the spectral signal-to-noise ratio of the output signal light is effectively improved.
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Citation Information

Patent Citations

  • Fiber laser for simply monitoring output power

    CN115395348A

  • Long wave band erbium mixed amplifier with low noise, high gain and high plain

    CN1410824A

  • Low-noise high-gain 1550nm single-frequency optical fiber amplifier

    CN221328316U