Optical communications – Transmitter and receiver system – Including optical waveguide
Reexamination Certificate
2008-05-13
2008-05-13
Tran, Dzung (Department: 2613)
Optical communications
Transmitter and receiver system
Including optical waveguide
C398S187000, C398S204000
Reexamination Certificate
active
07373086
ABSTRACT:
With a single laser light source, the line width of a beat signal is set to a few tens of kHz or less without it fluctuating over time, and the frequency thereof is set as desired. CW light from a CW laser light source is input into an electroabsorption modulator to which a sine wave electrical signal is applied. A modulation sideband which is made up from line spectra at separations equal to the modulation frequency is generated from the electroabsorption modulator. An optical fiber for higher-order soliton compression broadens the optical spectrum width, and increases the number of line spectra. A tunable wavelength filtering device which is made up from optical fiber gratings and optical circulators chooses two of the line spectra, which are combined by an optical coupler with their beat signal being heterodyne wave detected by a photo-detector.
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Kawanishi Satoki
Yamamoto Takashi
Harness & Dickey & Pierce P.L.C.
Nippon Telegraph and Telephone Corporation
Tran Dzung
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