Abstract
In high-speed long-haul wavelength division multiplexing (WDM) transmission systems, dispersion and dispersion slope compensation over broadband have been recognized as an important technique to improve performance of transmission links.1 One of dispersion compensation techniques is to use a higher-order-mode (HOM) in a few-mode fiber along with a spatial mode converter (MC).2 Main advantages would be achievement of a very large negative dispersion in a shorter length of dispersion compensating fiber (DCF). Shorter interaction length can provide a lower insertion loss, and nonlinear effects could be reduced due to its large effective area.3 Despite these merits, HOM dispersion compensating techniques need mating mode converters with a high conversion efficiency and low insertion loss. LP01-LP11 and LP01-LP02 converters have been reported using periodic coupling such as microbending4 and photo-induced index change5 in optical fibers. Recently, an MC of ring type based on a tapered hollow optical fiber (HOF) and an HOM dispersion compensation technique in a step index LP02 DCF are reported by the authors.6,7
© 2002 Optical Society of America
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