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A \lambda /4 -Shifted Distributed-Feedback Laser Diode With a Fiber Ring Cavity Configuration Having an OSNR of 85 dB and a Linewidth of 7 kHz

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5 Author(s)
Ho Thi Quynhanh ; Res. Inst. of Electr. Commun., To- hoku Univ., Sendai ; Akihito Suzuki ; Masato Yoshida ; Toshihiko Hirooka
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We newly propose a lambda/4-shifted distributed-feedback laser diode (DFB-LD) that employs a fiber ring cavity configuration and which incorporates an ultranarrow band fiber Bragg grating (FBG) in the cavity. By controlling the FBG wavelength to match the oscillation wavelength of the DFB-LD, we achieved stable single-mode oscillation where the sidemodes of the DFB-LD and the Fabry-Perot modes induced by the ring configuration were sufficiently suppressed. Large performance improvements with an optical signal-to-noise ratio of 85 dB and a linewidth of 7 kHz were obtained.

Published in:

IEEE Photonics Technology Letters  (Volume:20 ,  Issue: 18 )