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Timing jitter reduction of a gain-switched semiconductor laser by external injection-seeding

Ultra-short optical pulse generation from gain-switched semiconductor lasers is important for applications such as time-division multiplexed optical communication systems, optical sampling, and soliton generation. Considerable research interest has been focused on reducing pulse widths to sub-picosecond levels. However, as the pulse width is made shorter, pulse-to-pulse timing jitter becomes important and can limit system performance, through such parameters as bit error rate and temporal resolution. Recent work shows that self or, external injection-seeding reduces timing jitter in gain-switched Fabry-Perot (FP) lasers.1,2 We report an experimental investigation of the impact of external seeding on timing jitter in gain-switched FP and distributed feedback (DFB) lasers and show that the timing jitter can be greatly reduced by external injection-seeding with continuous (CW) light, regardless of the laser structure, i.e., FP or DFB. We also show that there exists an optimum seeding power to obtain short pulses with low timing jitter.