Abstract

An all-optical wavelength converter is one of the key devices for realizing future high-speed and flexible wavelength-division multiplexed (WDM) networks. Recently, grouping WDM channels in the routing process have been proposed in order to construct simpler optical cross connects (OXCs) that can handle a large number of WDM channels.1,2 1.55-µm-band quasi-phase-matched (QPM) wavelength converters based on difference frequency generation (DFG) in periodically poled LiNbO3 (LN) are promising because of their novel features, such as multi-channel conversion, high-efficiency, low noise, and transparency to bit-rate and data format.3 However, conventional one-step wavelength conversion using QPM-LN is not usable when input and destination channels overlap in wavelength. In addition, wavelength converters are desired to keep the order of the channels so as to simplify the algorithm of the grouped wavelength routing system. So, wavelength converters that give uniform frequency shift are demanded. In this paper, we propose an optical frequency shifter (OFS) using two QPM-LN wavelength converters that satisfy these requirements. We also demonstrate broad-band multi-channel shifting by utilizing the proposed OFS.

© 2002 Optical Society of America

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References

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