Device for conversion of all optical non-return-to-zero amplitude modulation code to bi-phase shift keying code

Abstract

The present invention relates to a device of converting all-optical nonreturn to zero amplitude modulation code into binary phase shift keying code, belonging to the optical communication technical field. The present invention comprises a probe light source, a gain adjustable optical amplifier, a 2x1 optical coupler, a cascaded silicon-based micro ring resonant cavity waveguide and an optical band-pass filter. The gain adjustable optical amplifier amplifies a to-be-converted NRZ signal to needed power; the signal is coupled with probe light and emitted into the cascaded silicon-based micro ring resonant cavity waveguide; the nonlinearity of the ring resonant cavity is utilized to change the phase of the probe light, thereby realizing the conversion from nonreturn to zero amplitude modulation code to binary phase shift keying code, and filtering out the converted signal through the optical band-pass filter. The present invention is few in devices used and compact in structure, decreases hardware cost, and simplifies system structure. Moreover, as the silicon-based waveguide used is easy to be integrated with COMS circuits and fast in response speed, the present invention can meet the interconnection requirements of the next-generation high speed network.

Description

technical field [0001] The invention relates to a code conversion device in the technical field of optical fiber communication, in particular to a conversion device from an all-optical non-return-to-zero amplitude modulation code to a binary phase-shift keying code. Background technique [0002] Optical signal processing is considered to be one of the key technologies for the development of future optical networks. Among them, all-optical modulation code conversion is directly converted from one modulation code to another modulation code because it does not need to demodulate the electrical signal. more and more people's attention. Non-return-to-zero amplitude modulation code (NRZ) has the advantages of simple sending and receiving, but its anti-nonlinear performance is poor, so it is suitable for short-distance transmission and is widely used in metropolitan area networks. Phase modulation codes, such as binary phase shift keying code (BPSK), have high sensitivity and stro...

AI Technical Summary

Problems solved by technology

This scheme has several disadvantages: first, the recovery time of SOA limits the rate of code conversion, and the rate of this scheme is 10.7Gb / s; second, an auxiliary light is needed to suppress the rapid change of carriers in SOA to suppress The amplitude jitter of the output signal increases the cost and reduces the amplitude of the output signal; third, in order to amplify the signal, an additional SOA is added to each arm of the MZI in the implementation, which increases the complexity of the device

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