Passive optical network optical line terminal receiver and its demodulation module based on rsoa

Abstract

The present invention provides a performance-optimized demodulation module of an RSOA-based passive optical network optical line terminal receiver, and an optical line terminal receiver using the demodulation module. RSOA is used as an optical modulator to exert its power amplification, The advantages of re-modulation, low cost, and colorless light source management make it possible to demodulate in the receiver through three demodulation methods through digital signal processing under the simultaneous existence of intensity modulation and phase modulation after RSOA, according to the system After the transmission performance index is judged, the receiver performance of the optical line terminal can reach the optimum under different system parameters.

Description

technical field [0001] The present invention relates to optical communication technology, in particular to optical network technology. Background technique [0002] As the mainstream technology of "ultra-broadband access" in fixed network, passive optical network PON has been widely used in high-speed broadband access network worldwide. With the rapid growth of network bandwidth requirements for emerging multimedia services, such as digital high-definition TV, video telephony and other services, the annual growth of end-user bandwidth requirements is increasing by more than 50%. High-speed optical devices and complex framing technology will face the dual challenges of technology and cost when upgrading to a single-wavelength rate of 10Gb / s or more. In 2012, the full-service access organization FSAN introduced WDM access technology into NG-PON2, and the introduction of wavelength division multiplexing WDM has become the general trend. [0003] Reflective semiconductor optic...

AI Technical Summary

Problems solved by technology

Since the modulation based on RSOA generates intensity modulation and phase modulation signals at the same time, the optical line terminal receiver (uplink receiver) cannot judge which method of intensity information or phase information is better for demodulation.

Moreover, coherent detection is sensitive to phase noise. Even if the local oscillator light and the optical carrier come from the same laser, with tens of kilometers of optical fiber transmission, the phase noise of the transmitting and receiving lasers is irrelevant, and the coherence decreases, which will lead to the deterioration of transmission performance.

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