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Proceedings Paper

New frequency stabilization method of a semiconductor laser using the Faraday effect of the Rb absorption line
Author(s): Shinichi Ito; Toshiya Nimonji; Akihiko Sawamura; Takashi Sato; Masashi Ohkawa; Takeo Maruyama
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Paper Abstract

We normally apply a precise amount of electrical feedback into the laser injection current, to stabilize the oscillation frequency of a semiconductor laser. This feedback method usually needs a small direct modulation to the laser injection current, to obtain an error signal. This broadens the oscillation width of the laser diode, but certain applications, such as those related to coherent optical communications, benefit from, and in fact require narrower oscillation linewidth. We obtain the error signal, and stabilize the laser oscillation frequency in narrower oscillation linewidth, using the Faraday effect of the Rb absorption line. Our next task involves frequency-stabilization, which we accomplish, using a large frequency discrimination gain (Gd). By incorporating our "PEAK" circuit, which utilizes the envelope detection method to determine the switching points between two different absorption signals corresponding to the different magnetic fields and different polarization conditions, we increases the Gd in our stabilization system.

Paper Details

Date Published: 17 June 2003
PDF: 10 pages
Proc. SPIE 4989, Optical Devices for Fiber Communication IV, (17 June 2003); doi: 10.1117/12.474809
Show Author Affiliations
Shinichi Ito, Niigata Univ. (Japan)
Toshiya Nimonji, Niigata Univ. (Japan)
Akihiko Sawamura, Niigata Univ. (Japan)
Takashi Sato, Niigata Univ. (Japan)
Masashi Ohkawa, Niigata Univ. (Japan)
Takeo Maruyama, Niigata Univ. (Japan)

Published in SPIE Proceedings Vol. 4989:
Optical Devices for Fiber Communication IV
Michel J. F. Digonnet, Editor(s)

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