Gain flattening filter, optical fiber amplifier and wavelength division multiplexing communication system

By using three sections of optical fiber and multiple cascaded fiber Bragg gratings in the optical fiber amplifier, the gain flattening of the optical signal is achieved, solving the problem of uneven gain in the wavelength division multiplexing communication system and improving the system's signal-to-noise ratio and transmission efficiency.

CN120652618APending Publication Date: 2025-09-16CHINA UNITED NETWORK COMM GRP CO LTD
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Patent Information

Application Number
CN202510998719.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-18
Publication Date
2025-09-16

AI Technical Summary

Technical Problem

In wavelength division multiplexing communication systems, existing optical fiber amplifiers have inconsistent gains at different channel wavelengths due to uneven gain spectrum, causing power imbalance and degradation of the system signal-to-noise ratio.

Method used

A simple gain-flattening filter is used to achieve gain flattening of the optical signal through three sections of optical fiber and multiple cascaded fiber Bragg gratings. The coupling effect of the fiber Bragg grating is used to couple the low-order mode energy to the high-order mode, and the high-order mode is filtered out in the third optical fiber, retaining only the energy-flattened low-order mode output.

Benefits of technology

It achieves gain flattening of optical signals, simplifies the device structure, is suitable for wavelength division multiplexing communication systems with optical fiber as the main transmission medium, and improves the system's signal-to-noise ratio and transmission efficiency.

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Abstract

The invention provides a gain flattening filter, an optical fiber amplifier and a wavelength division multiplexing communication system, relates to the technical field of optical communication, and is used for realizing gain flattening filtering. The gain flattening filter comprises N first optical fibers in a first fiber core mode, N second optical fibers in the first fiber core mode, M second optical fibers in the second fiber core mode and N third optical fibers in the first fiber core mode, the second optical fiber comprises a plurality of cascaded fiber bragg gratings, and the plurality of cascaded fiber bragg gratings are used for coupling at least one first fiber core mode in the N first fiber core modes to at least one second fiber core mode in the M second fiber core modes, the mode order of at least one second fiber core mode in the M second fiber core modes is higher than the mode order of at least one first fiber core mode in the N first fiber core modes; the first optical fiber, the second optical fiber and the third optical fiber are sequentially connected. According to the scheme, the gain flattening of the optical signal can be realized through the gain flattening filter with a simple structure.
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