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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 14 — May. 10, 2005
  • pp: 2895–2901

Generation of picosecond pulses at five close wavelengths by use of a self-seeded Fabry–Perot laser diode and a spectrum-split fiber Bragg grating

Yunqi Liu, Kin Seng Chiang, and Pak Lim Chu  »View Author Affiliations


Applied Optics, Vol. 44, Issue 14, pp. 2895-2901 (2005)
http://dx.doi.org/10.1364/AO.44.002895


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Abstract

We have demonstrated simultaneous generation of stable picosecond laser pulses at five close wavelengths at a pulse repetition rate of ∼2 GHz by using a self-seeding configuration that consisted of a gain-switched Fabry–Perot laser diode (FPLD) with an external cavity formed by a tunable spectrum-split fiber Bragg grating (FBG). The FBG selected only one of the modes of the FPLD and, at the same time, filtered the selected FPLD mode such that the reflection from the FBG, tapped with a directional coupler, provided an output of dual-wavelength pulses and the transmission through the FBG provided an output of three-wavelength pulses. We could change the intensities and the wavelength separations of the pulses by adjusting the modulating radio frequency and the temperature of the FPLD and the separation of the FBG reflection peaks. In our experiments the highest side-mode suppression ratios of the pulses obtained were 44.5 dB for the dual-wavelength output and 25.0 dB for the three-wavelength output. Also, the laser was demonstrated to minimize pulse intensity imbalance and produce equally separated wavelengths (with a wavelength separation of 0.2 nm). This simple laser offers considerable flexibility for various applications.

© 2005 Optical Society of America

OCIS Codes
(140.3460) Lasers and laser optics : Lasers
(320.5390) Ultrafast optics : Picosecond phenomena
(350.2770) Other areas of optics : Gratings

History
Original Manuscript: October 25, 2004
Revised Manuscript: December 24, 2004
Manuscript Accepted: January 1, 2005
Published: May 10, 2005

Citation
Yunqi Liu, Kin Seng Chiang, and Pak Lim Chu, "Generation of picosecond pulses at five close wavelengths by use of a self-seeded Fabry–Perot laser diode and a spectrum-split fiber Bragg grating," Appl. Opt. 44, 2895-2901 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-14-2895


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