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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 21 — Oct. 12, 2009
  • pp: 18596–18605

Ultra broadband microwave frequency combs generated by an optical pulse-injected semiconductor laser

Yu-Shan Juan and Fan-Yi Lin  »View Author Affiliations

Optics Express, Vol. 17, Issue 21, pp. 18596-18605 (2009)

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We have demonstrated and characterized the generation of ultra broadband microwave frequency combs with an optical pulse-injected semiconductor laser. Through optical pulse injection, the microwave frequency combs generated in the slave laser (SL) have bandwidths greater than 20 GHz within a ±5 dB amplitude variation, which is almost 3-fold of the 7 GHz relaxation oscillation frequency of the laser used. The line spacing of the comb is tunable from 990 MHz to 2.6 GHz, determined by the repetition frequency of the injection optical pulses produced by the master laser (ML) with optoelectronic feedback. At an offset frequency of 200 kHz, a single sideband (SSB) phase noise of -60 dBc/kHz (-90 dBc/Hz estimated) in the 1 st harmonic is measured while a noise suppression relative to the injected regular pulsing state of the ML of more than 25 dB in the 17th harmonic is achieved. A pulsewidth of 29 ps and a rms timing jitter of 18.7 ps are obtained in the time domain for the microwave frequency comb generated. Further stabilization is realized by modulating the ML at the fundamental frequency of the injected regular pulsing state. The feasibility of utilizing the generated microwave frequency comb in frequency conversion and signal broadcasting is also explored. The conversion gain of each channel increases linearly as the signal power increases with a ratio of about 0.81 dB/dBm.

© 2009 Optical Society of America

OCIS Codes
(140.3520) Lasers and laser optics : Lasers, injection-locked
(140.5960) Lasers and laser optics : Semiconductor lasers
(190.3100) Nonlinear optics : Instabilities and chaos
(350.4010) Other areas of optics : Microwaves

ToC Category:
Lasers and Laser Optics

Original Manuscript: August 13, 2009
Revised Manuscript: September 25, 2009
Manuscript Accepted: September 29, 2009
Published: September 30, 2009

Yu-Shan Juan and Fan-Yi Lin, "Ultra broadband microwave frequency combs generated by an optical pulse-injected semiconductor laser," Opt. Express 17, 18596-18605 (2009)

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