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Linewidth narrowing and optical phase control of mode-locked semiconductor ring laser employing optical injection locking

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2 Author(s)
Takada, A. ; NTT Opt. Network Syst. Lab., Kanagawa, Japan ; Imajuku, W.

The linewidth of the individual modes of an actively mode-locked extended-ring-cavity semiconductor laser is reduced from a free running linewidth of over 200-20 kHz by the injection of a narrow linewidth continuous-wave (CW) light. The optical phase of the injection-locked pulses can be controlled by adjusting the free-running optical frequency of the semiconductor ring laser. The variation in the optical phase of the output pulses versus the change of the free-running optical frequency is evaluated to be 0.57/spl pi/ radians within the locking range of about 96 MHz by observing temporal shape of the beat signal formed between output pulses and CW injection light.

Published in:

Photonics Technology Letters, IEEE  (Volume:9 ,  Issue: 10 )