A major problem encountered in using AlGaAs lasers for optical heterodyne phase-shift-keying communication is that of broad linewidth caused by phase noise in the laser. Typical linewidth/bit rate ratio requirements are ≤0.1 % for PSK and ≤0.3% for DPSK. When these are met, the performance degradation due to the linewidth of the source becomes negligible. For AlGaAs lasers with 10-20-MHz linewidths this means a transmission rate in excess of several gigahertz, which exceeds the needs of many applications and which is difficult to achieve. For more common data rates (50-500 MHz) the linewidth becomes a serious problem.

© 1988 Optical Society of America

PDF Article


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription