Traveling wave optical modulator and its regulating method

Abstract

A traveling wave optical modulator in which occurrence of jitter is suppressed when it is driven through a driver, and its regulating method; especially in which the degree of freedom is enlarged in the combination of the driver and the traveling wave optical modulator and jitter can be suppressed effectively even after they are combined, and its regulating method. The traveling wave optical modulator comprises a substrate exhibiting electrooptic effect, an optical waveguide formed on the substrate, and a modulation electrode performing modulation control on a light wave propagating through the optical waveguide, characterized in that the traveling wave optical modulator is connected with a driver performing drive control thereof, and the frequency characteristics (b) of electrooptic conversion response of the traveling wave optical modulator is regulated to correct the frequency characteristics (a) of gain of the driver. Preferably, regulation of the frequency characteristics of electrooptic conversion response is characterized by the regulation of at least one of the impedance of the modulation electrode or the impedance of a termination resistor.

Description

technical field [0001] The present invention relates to a traveling-wave optical modulator and its adjustment method, in particular to a traveling-wave optical modulator for driving and controlling a driving driver connected to the traveling-wave optical modulator. device and its adjustment method. Background technique [0002] In recent years, when evaluating optical modulators, attention has been drawn to the characteristic called jitter, which shows how the optical signal obtained when the optical modulator is driven vibrates over time. [0003] Jitter is an indicator that indicates the vibration of an optical signal over time, such as figure 1 As shown in , the optical eye pattern waveform is accumulated and defined as the amplitude at signal crossover. [0004] In order to improve the jitter of the optical signal obtained when the optical modulator is driven, it is necessary to improve the following characteristics for the optical modulator or the driver for driving a...

AI Technical Summary

Problems solved by technology

[0015] In addition, although the frequency characteristics of the driving driver and the optical modulator are good individually, when the two are combined, there are many cases where the jitter deteriorates, and the matching of the driving driver and the optical modulator is also a problem.

[0016] Therefore, in order to obtain good optical transmission characteristics with little jitter, it is necessary to perform complicated work such as selecting an optical modulator to be combined with an optical modulator to be used, selecting a driving driver to be combined with an optical modulator to be used, etc.

Images