A low jitter passively mode locked laser diode at 40 GHz using regenerative feedback via an optical fiber loop
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Mode-locked laser diodes (MLLDs) are excellent candidates for generating ultrashort high frequency pulses for a number of applications. Although more prone to noise than active MLLDs, passive MLLDs do not require any external electrical oscillator. But many applications for such lasers require highly stable optical pulses with sub-picosecond timing jitter and in this paper, a technique for reducing the RF phase noise in a passive MLLD is reported. Regenerative mode locking is a technique used to significantly reduce the timing jitter by providing a self-referencing mechanism to continuously correct the phase timing of the pulses. However, many of the current techniques used are based on electrical extraction and high-Q RF filtering of the pulses, which adds several components and considerable system complexity. A simplified all-optical regenerative mode locking technique which can provide significant reductions in phase noise and timing jitter is presented. The proposed method requires an optical fiber loop which relays the output pulse stream from the laser back into its resonator to induce self-beating intensity modulation of the pulses.
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High frequency optoelectronic oscillators based on the optical feedback of semiconductor mode-locked laser diodesHaji, M.; Hou, L.; Kelly, A.; Akbar, J.; Marsh, J.; Arnold, J.; Ironside, Charlie (2012)Optical self seeding feedback techniques can be used to improve the noise characteristics of passively mode-locked laser diodes. External cavities such as fiber optic cables can increase the memory of the phase and ...
Subpicosecond colliding pulse mode locking at 126 GHz in monolithic GaAs/AlGaAs quantum well lasers: Experiments and theoryTandoi, G.; Javaloyes, J.; Avrutin, E.; Ironside, Charlie; Marsh, J. (2013)In this paper, we present results from monolithic passively mode-locked GaAs/AlGaAs quantum well lasers operating at 830 nm. Colliding pulse mode locking is achieved at repetition rates of 126 GHz with pulsewidths as short ...
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