Optic transmitter and method for producing optical return-to-zero codes in a variety of code formats

Abstract

The invention discloses an optical transmitter used for generating return to zero optical code signal of a plurality of code type and a method thereof. The core of the invention lies in that a compound data signal including a data signal of return to zero code and a data signal of reversing return to zero code is taken as a modulation signal; a clock signal of different frequency generated by a controllable frequency divider is taken as an offset controlling signal; the compound data signal and the offset controlling signal are effected on the continuous optical signal by using the transmission characteristic of a mach-zehnder modulator, which can produce the return to zero optical code data signal of a plurality of code type. The return to zero optical code data signal of a plurality of code type can be generated by only one optical modulator by adopting the invention, which does not only reduce the using quantity of optical apparatuses and the cost of the optical transmitter, but also avoids the alignment problem of the optical signal arising from the use of a plurality of optical apparatuses.

Description

technical field [0001] The present invention relates to optical communication technology, in particular to an optical transmitter and method for generating optical return-to-zero code signals of various code types. Background technique [0002] In high-speed and long-distance optical communication systems, RZ (Return-to-Zero) signals are usually used to improve transmission performance. Compared with NRZ (Non Return-to-Zero) signals at the same rate, RZ signals have narrower pulses and stronger peak power, and can use dispersion management and nonlinear effect management to achieve long-distance transmission. In ultra-high-speed optical transmission systems, the use of CSRZ (Carrier Suppressed Return-to-Zero) signals can effectively reduce pulse broadening during transmission and suppress the nonlinear effects of optical fibers. [0003] At present, the 40Gb / s high-speed optical fiber communication system is becoming one of the research and commercial hotspots in the indust...

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