Reconfigurable optical add-drop multiplexer (ROADM) node, optical wavelength correction frequency shifter and implementation method

Abstract

The invention discloses an ROADM node, an optical wavelength correction frequency shifter and an implementation method. The wavelength correction frequency shifter comprises a sawtooth wave electric signal generator and an electro-optic phase modulator, wherein the sawtooth wave electric signal generator produces continuous sawtooth wave electric signals with the repetition frequency of F, which serve as driving electric signals, and the electro-optic phase modulator loads driving electric signals to conduct frequency shift delta fi on the central wavelength of input optical signals, so that the central wavelength lambada i of input optical signals is close to the expected central wavelength lambada i-1, and c represents the velocity of light. According to the ROADM node, the optical wavelength correction frequency shifter and the implementation method, the central wavelength of input optical signals is close to the designed central wavelength of an ROADM through correction of the central wavelength of input optical signals, so that the effective bandwidth loss of the ROADM, which is caused by the multistage filtering cascaded filtering function, is reduced, an all-optical method is used for correcting the wavelength of optical signals, and the implementation method is applicable to ROADM nodes of any wavelength multiplexing wavelength division multiplex (WDM) optical networks of various transmission rates.

Description

technical field [0001] The invention relates to the technical field of all-optical signal processing, in particular to a ROADM node, an optical wavelength correction frequency shifter and an implementation method. Background technique [0002] Optical add-drop multiplexer (Optical Add-drop Multiplexer, OADM) is an important node device in the optical transmission network. And the data upload (Add) sent by the local user to other nodes of the network is multiplexed into the optical channel. The basic requirement for the OADM node is to enable the required wavelength to be added and dropped while ensuring the smooth passage of other wavelengths. [0003] OADM can generally be divided into two categories, namely fixed OADM and reconfigurable OADM (Reconfigurable Optical Add-drop Multiplexer, ROADM). The former can only add and drop a specific wavelength or multiple specific wavelengths, that is, the routing of nodes is fixed; while the latter’s add and drop wavelengths can be...

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to solve the problem that the effective bandwidth is lost due to multi-stage filtering after the optical signal is transmitted through multiple ROADM nodes in the optical network

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