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Frequency stabilization of optical FDM signals by using a fiber-Bragg-grating Fabry-Perot interferometer

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Abstract

In optical frequency-division-multiplexing (optical FDM) networks, a precise optical-frequency stabilization is indispensable for arranging multicarriers located at different nodes into equal channel spacing for avoiding interchannel interference. A master-slave control method that uses optical resonators has been proposed.1 Slave LDs are synchronized to an absolutely stabilized master frequency source by means of equally spaced fringes of resonators. The use of several kinds of Fabry-Perot interferometers (FPIs), such as a crystal plate, polished silica glass, and LiNbO3 waveguide, as resonators has been reported. These are, however, the most difficult devices to manufacture with the tight tolerances required for the systems. An FPI can be also formed by a fiber Bragg grating pair.2 It can be reproducibly manufactured by means of a simple photowriting technique.3 This paper describes a master-slave control system that uses a fiber-Bragg-grating Fabry-Perot interferometer (FBG-FPI) with high accuracy.

© 1995 Optical Society of America

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