Clock recovery method for high-speed optical time-division multiplexing system

Abstract

The invention provides a clock recovery method for a high-speed optical time-division multiplexing system. In the method, a base frequency clock is put into a high-speed optical time-division multiplexing data tape in an additional phase modulation manner, so that co-transmission of high-speed optical time-division multiplexing data and the base frequency clock is realized; and base frequency clock recovery of the optical time-division multiplexing system can be realized by only separating the base frequency clock out at a receiving end. According to the method, the defect of the need of the optical phase-locked loop structure for the recovery of a clock from optical time-division multiplexing data streams in the prior art is overcome, and a foundation is laid for the research of a high-speed optical signal processing unit orienting to a next generation all-optical communication network. The method has the characteristics of novel scheme, simple structure and high compatibility, and has extensive application prospects in the aspects of optical fiber communication system, all-optical switch networking, and the like.

Description

technical field [0001] The invention relates to a clock recovery method for an optical time division multiplexing system, in particular, a data and clock co-transmission scheme based on additional phase modulation is designed to realize a method for clock recovery of the optical time division multiplexing system. Background technique [0002] Optical time division multiplexing (OTDM) technology uses ultra-short pulses and return-to-zero codes (RZ) to combine 2 N (N is a positive integer) the base rate B bit / second data communication is mapped to a base frequency clock cycle, and 2 in the time domain N The optical signal of roadbed rate is multiplexed into B×2 N High-speed optical pulse data stream at bit / s rate. After the OTDM signal is transmitted through the optical fiber, the data signal of each road-base rate is recovered through the optical demultiplexer. Compared with the wavelength division multiplexing (WDM) system, OTDM uses a single light source, which avoids th...

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Problems solved by technology

Since the phase-locked loop is a "memory" system, its output needs a certain amount of time to respond to input changes. Although this method recovers the clock with small jitter and high quality, it is difficult to obtain fast locking, that is, it is difficult to obtain fast phase synchronization of

In addition, with the increase of the multiplexing rate, it is difficult to realize high-rate (>160Gbit / s) electro-optic / all-optical phase detectors, which restricts the application of this method in ultra-high-rate OTDM systems

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