Self-coherent receiver system based on carrier extraction

CN119135278APending Publication Date: 2024-12-13WESTLAKE INSTITUTE FOR OPTOELECTRONICS
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Patent Information

Application Number
CN202411151280.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-08-21
Publication Date
2024-12-13

AI Technical Summary

Technical Problem

The existing short-range optical communication systems cannot meet the growing bandwidth demand. Traditional direct detection solutions such as IM/DD have transmission capacity bottlenecks and high costs. Self-coherent detection systems are costly and complex in short-range communications and cannot effectively meet the needs of them. Large bandwidth and low cost demand.

Method used

Adopt a self-coherent receiver system based on carrier extraction, including an optical modulation transmitting module and an optical reception demodulation module. Through components such as IQ modulator, extremely narrow bandpass filter and 90° optical mixer, homologous extraction of signals and carriers is achieved. and digital signal processing with reduced complexity avoids inter-signal beat frequency interference and polarization dimension loss.

Benefits of technology

The full-field signal recovery is realized, the complexity and power consumption of digital signal processing are reduced, wavelength drift and phase noise problems are avoided, the cost and high spectral efficiency are maintained, and the transmission capacity is increased, which is suitable for short-range optical communications.

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Abstract

The invention discloses a self-coherent receiver system based on carrier extraction. The self-coherent receiver system comprises an optical modulation transmitting module, a transmission link and an optical receiving demodulation module, in the light modulation transmitting module, the output of a laser is split by a light beam splitter, and one path is modulated into signal light S; the other path is not modulated and kept as a carrier C, and enters the variable optical attenuator to adjust the carrier signal power ratio; the two paths of light are combined to serve as emission signals; the optical receiving demodulation module comprises a self-coherent receiver module for carrier extraction and a DSP module; transmitting signals pass through the transmission link and then enter the light beam splitter for light splitting; after one path passes through the ultra-narrow band pass filter, only the carrier C is left, and the carrier C and the other path still having the signal light S and the carrier C enter the optical mixer for beat frequency; two photoelectric balance detectors are used for receiving the output of the optical mixer, and DSP demodulation recovery is carried out after an electric signal is obtained. According to the invention, the complexity and power consumption of digital signal processing can be reduced, homologous homodyne detection is realized, and a polarization multiplexing structure can be expanded.
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Citation Information

Patent Citations

  • Optical single-side band modulating device

    CN101800606A

  • Coherent reception communication method and system of DSP-free dual-polarization QAM modulation

    CN109510669A

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