An optical transmitter supporting multiple modulation formats and its control method

Abstract

The invention discloses an optical transmitter supporting multiple modulation formats and a control method. The optical transmitter comprises a laser source, two parallel optical modulators, a waveform selection module, a drive amplification module, a bias control module, a master control module and an optical amplifier. The master control module is connected with the waveform selection module, the drive amplification module and the bias control module and transmits control information. The waveform selection module conducts series-parallel conversion on data to be modulated according to input modulation parameters and generates clock signals, drive amplification is conducted on the clock signals, and then the clock signals are then loaded to the optical modulator. The bias control module selects a proper bias working point according to the specified modulation format. The modulated optical signals are amplified by the optical amplifier and then are used as output of the transmitter. The optical transmitter can flexibly support multiple modulation formats only by utilizing binary data, switching between multiple modulation formats such as NRZ-2PSK, RZ-2PSK with the duty ratio of 50%, NRZ-QPSK, CSRZ-QPSK and 16 QAM is achieved, and the optical transmitter is suitable for high-speed and flexible optical fiber communication systems and networks in the future.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and more specifically relates to an optical transmitter supporting multiple modulation formats and a control method. Background technique [0002] With the popularization of high-speed Ethernet, driven by policies such as fiber-to-the-home and broadband China, and the development of new multimedia services, broadband users and data volumes have grown significantly and rapidly, and people's demand for large-capacity optical communication networks has further increased. Especially in recent years, the growth rate of transmission capacity of optical fiber communication system has begun to slow down, and the problem of capacity crisis has gradually emerged. There are two main ideas for increasing the capacity of existing Wavelength Division Multiplexing (WDM) optical communication systems: [0003] One is to expand the available wavelength range of the WDM system, such as using t...

AI Technical Summary

Problems solved by technology

Because the traffic pattern of the data center has the characteristics of diversification, ultra-high speed, low delay, burstiness, and irregular service time, the traditional grid-based optical communication system will face huge challenges, such as when the traffic is small and the system is empty Serious, resulting in a large degree of waste of bandwidth and energy

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