Coherent optical module and optical communication system

Abstract

The invention discloses a coherent optical module and an optical communication system, and relates to the technical field of communication, the optical module comprises: a sending end, wherein a first optical splitter divides the output of a laser into one path of local oscillation light and N paths of optical carriers with equal power, the local oscillation light is sent out through a first circulator after coarse tuning, each coherent optical transmitter receives a group of modulated four-path electric signals, modulates the modulated four-path electric signals and one path of optical carrier into polarization multiplexing signal light, and transmits the polarization multiplexing signal light through a second circulator; and a receiving end receives the local oscillation light through a first circulator, amplifies the local oscillation light through an amplifier, divides the local oscillation light into N paths of local oscillation light through a second optical splitter, and finely adjusts the local oscillation light through finely adjustable delay lines respectively. Each polarization-independent coherent optical receiver receives signal light of the optical link from the second circulator in a one-to-one manner, performs coherent frequency mixing and photoelectric conversion on the signal light and one path of finely adjusted local oscillation light to obtain a group of four-path electric signals, and outputs the four-path electric signals to the N-channel coherent optical modulation and demodulation DSP chip for demodulation. According to the invention, low-cost, low-power-consumption and high-capacity short-distance optical interconnection can be realized.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a coherent optical module and an optical communication system. Background technique [0002] With more and more deployments and trials of 5G base stations, the 5G information age marked by big data and ultra-broadband has arrived. As the transmission pipeline and bearing basis for these data, traffic, and information, the optical fiber communication system must adapt to the business requirements for large-capacity, high-speed, and low-latency transmission. [0003] On the one hand, the cost per bit of information transmission in optical fiber communication systems is one of the important factors that determine whether operators accept new transmission technologies and deploy them on a large scale. Digital coherent optical communication has been widely used in long-distance backbone networks due to its advantages in compensating for fiber damage, high sensitivity, and adap...

AI Technical Summary

Problems solved by technology

The space division multiplexing technology combined with the new modulation format has been verified in the field of optical access network. It can realize super-large-capacity multi-user access and demonstrate strong expansion capabilities, but it has not completely solved the problem of cost control and high-speed transmission of bidirectional symmetrical capacity. question

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