Abstract
The random differences among the light pulses emitted by a single-mode semiconductor laser (SML) under last pseudorandom word modulation (PRWM) are crucial for the performance of optical communications systems. Timing jitter of the light pulses1,2 has been recognized as a limiting factor in the performance of a DD/IM system modulated in the Gbit/sec range through an increase in the BER. This timing jitter leads to degrading pattern effects.3 In addition, it has been recently shown that pulse-to-pulse variations in the range of frequency chirp (chirp noise) during the modulation period also generate BER floors.5 Chirp noise arises from spontaneous emission noise, and its connection with timing jitter was pointed out in Ref. 4.
© 1993 Optical Society of America
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