Abstract
Monolithic cavity colliding pulse mode-locked (CPM) semiconductor lasers have been shown to give excellent performance1 and show promise for high bit rate communications systems. In this paper, the performance of the CPM configuration is compared with that of the self-colliding pulse configuration (SCPM) shown in Fig. 1. The SCPM configuration is one half of the CPM configuration, with a high reflectivity coating placed on the half-length saturable absorber. In CPM, two separate pulses of energy E collide in the center saturable absorber. In SCPM a pulse of energy E collides with itself in the half-length absorber. The performance of the two devices should be identical due to the symmetry of the two configurations. Both structures should therefore take equal advantage of the colliding pulse benefits.2-3 SCPM offers half the repetition rate for the same length device and a lower drive current at the expense of a high reflection coating. CPM devices are found to be very sensitive to asymmetrical cleaves whereas SCPM devices have guaranteed symmetry.
© 1992 Optical Society of America
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