Bias voltage control method and system for an optical IQ modulator

Abstract

The invention discloses a bias voltage control method and system of an optical IQ modulator, and relates to the technical field of communication. The bias voltage control method includes: loading any initial bias voltage on the two MZMs, scanning the bias voltage of the phase shifter to obtain a better bias voltage; maintaining the bias voltage of the phase shifter as a better bias voltage , scan the bias voltage of the first MZM to obtain a better bias voltage; keep the bias voltage of the first MZM at a better bias voltage, scan the bias voltage of the second MZM to get a better bias voltage; pass The iterative method updates the optimal bias voltage of the phase shifter and the two MZMs, and uses the optimal bias voltage obtained in the last iteration as the optimal bias voltage, and each iteration updates the optimal bias voltage of the phase shifter , to update the initial bias voltage loaded on each MZM. The invention has high real-time control precision, is stable and reliable, and can effectively reduce system performance loss.

Description

Bias voltage control method and system for optical IQ modulator technical field The present invention relates to the technical field of communication, specifically relate to a kind of bias voltage control method and system of optical IQ modulator system. Background technique [0002] Based on a single-channel 100 gigabit per second (Gb / s) optical transport network (Optical Transport Network, OTN) / wavelength division multiplexing (Wavelength Division Multiplexing, WDM) coherent optical fiber communication has been in the operator network Network-scale commercial use, key technologies of transmission systems, such as polarization multiplexing (Polarization Mux, PM), quadrature amplitude modulation A series of core technologies such as Quadrature Amplitude Modulation (QAM) coherent reception and digital signal processing are The 100Gb / s era has been broadly unified. With the continuous deepening of the "Broadband China" strategy, the operators in the inter-provincial...

AI Technical Summary

Problems solved by technology

[0005] The conventional bias voltage control method superimposes the low-frequency disturbance signal on the DC bias voltage, extracts the first harmonic component or the second harmonic component of the low-frequency disturbance signal through the closed-loop feedback control circuit, and performs corresponding The advanced digital closed-loop feedback processing realizes the automatic control of the bias voltage, and it is difficult to meet the high-precision requirements in practical applications.

Images