Chirp reduction in intensity-modulated semiconductor lasers for maximum transmission capacity of single-mode fibres
Abstract
Low chirp for directly modulated lasers is obtained for rectangular and exponential optical pulses, and the highest bitrates may be obtained for rectangular pulses. The finite rise and fall time is taken into account yielding roughly a twofold increase in bitrate over Gaussian pulses, if the modulation bandwidth is at least 2.5 times the bitrate. Using the rate equation approach for the semiconductor laser, an actual transmission of a 4 Gbit/s bit stream over 100 km fibre length has been modelled, indicating severe requirements for the bias level and the shaping of the electrical pulses.
- Publication:
-
Archiv Elektronik und Uebertragungstechnik
- Pub Date:
- October 1986
- Bibcode:
- 1986ArElU..40..283P
- Keywords:
-
- Chirp Signals;
- Fiber Optics;
- Laser Mode Locking;
- Light Modulation;
- Optical Communication;
- Semiconductor Lasers;
- Bandwidth;
- Carrier Frequencies;
- Pulse Communication;
- Refractivity;
- Lasers and Masers