Abstract
Recently, 1.55-μm repeaterless transmission systems using non-dispersion-shifted fiber (NDSF) have been intensely researched.1,2 In such systems, a large chromatic dispersion at the 1.55-μm wavelength may degrade the transmission characteristics when combined with laser chirp or self-phase modulation (SPM). Whereas external modulation is one solution for overcoming this difficulty,1,2 the use of dispersion-compensating fibers3 (DCFs) in the direct-modulation scheme is also a strong candidate because of its simplicity.4
© 1995 Optical Society of America
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