Abstract
Dynamic frequency shift or frequency chirping limits the transmission bandwidth of a single-mode fiber system, even if we employ a directly modulated dynamic-single-mode (DSM) laser.1 An external modulation technique is considered for the purpose of eliminating this problem, and some high-speed optical modulators such as those using an enhanced electroabsorption in a quantum well are being studied.2 However, possible phase modulation followed by external intensity modulation must be investigated to discuss no chirping modulation.
© 1986 Optical Society of America
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