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Method for controlling photomodulator bias voltage and relevant device

A bias voltage and optical modulator technology, which is applied in the field of signal transmission, can solve the problems of unstable phase shift signal and phase shift bias voltage, and achieve the effect of stabilizing the phase shift bias voltage and improving stability

Active Publication Date: 2012-07-04
HUAWEI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the π / 2 phase shift unit of the stacked MZM modulator, due to the instability of the phase shift bias voltage loaded on the π / 2 phase shift unit, the phase shift signal output by the π / 2 phase shift unit will be unstable. unstable

Method used

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  • Method for controlling photomodulator bias voltage and relevant device
  • Method for controlling photomodulator bias voltage and relevant device
  • Method for controlling photomodulator bias voltage and relevant device

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Embodiment Construction

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0034] The general phase modulation adopts the MZM modulator based on LiNbO3 crystal. The schematic diagram of the MZM modulator is shown in image 3 As shown, by input voltage v 1 (t) to change the electro-optic coefficient of LiNbO3, thereby changing the crystal refractive index, and the change of the refractive index causes the change of the optical phase to modulate the electrical signal onto the optical signal.

[0035] The following takes DQPSK as an exampl...

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Abstract

The invention discloses a method for controlling photomodulator bias voltage and a relevant device. The method comprises the following steps: acquiring an output signal of a photomodulator; acquiring the relation information of the output signal and a noise signal in the output signal; analyzing the relation information of the output signal and the noise signal to acquire the control information of phase-shift bias voltage; and according to the control information, acquiring current phase-shift bias voltage and loading the current phase-shift bias voltage on the photomodulator. The method forcontrolling photomodulator bias voltage in the embodiment of the invention has the function of automatic feedback adjustment and can adjust the bias voltage of a pi / 2 phase-shift unit of the photomodulator, thereby increasing the stability of the output signal of the photomodulator.

Description

technical field [0001] The present invention relates to the field of signal transmission, in particular to a method and a related device for controlling the bias voltage of an optical modulator. Background technique [0002] In the optical transmission system, the optical line modulation pattern is very critical to the optical transmission system, and the choice of the pattern directly affects the transmission performance, spectral efficiency, nonlinear tolerance and dispersion tolerance of the system. In high-speed optical transmission systems, codes based on phase modulation technology can generally be used. For example, Differential Phase Shift Keying (Differential Phase Shift Keying, DPSK) and Differential Quadrature Phase Shift Keying (Differential Quadrature Phase Shift Keying, DQP SK). [0003] DPSK and DQPSK phase modulation carry digital information through the phase, and the change of the phase information cannot change the final output optical power. figure 1 It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/03G02F1/01G02F1/35H04B10/12H04B10/50
CPCH04L27/2096H04B10/50577H04L27/2075H04B10/5053G02F1/0123H04B10/5055G02F1/2255H04B10/50575
Inventor 徐晓庚吕超杨彦甫
Owner HUAWEI TECH CO LTD