Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1992-12-02
1995-05-16
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359114, 359130, 359185, 359188, H04B 1000
Patent
active
054166292
ABSTRACT:
In long distance digital and frequency modulation systems that use optical sources having optical frequency chirp, degradation due to optical dispersion in the transmission fiber is overcome by filtering the laser wavelength representative of one of the binary levels (e.g., binary "0"). An optical source such as a DFB laser is directly frequency modulated by a digital data stream. A first digital level is represented by a first intensity of the modulated carrier corresponding to a carrier wavelength .lambda..sub.1 and a second digital level is represented by a second intensity of the modulated carrier corresponding to a carrier wavelength .lambda..sub.2. A wavelength selective reflector is used to filter the wavelength .lambda..sub.1 from the modulated carrier. The modulated carrier, from which wavelength .lambda..sub.1 has been filtered, is then coupled to an optical communication path for transmission. In one embodiment the wavelength selective reflector is coupled to the laser output using an optical circulator. In another embodiment, a directional coupler is used.
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E. G. Bryant, et al., "Two-Way Transmission at 2.488 Gbit/s Over a 132 km Operational Submerged Cable Using Erbium-Doped Fibre Power Amplifiers," Electronics Letters, vol. 26, No. 17, Aug. 16, 1990, pp. 1355-1357.
E. G. Bryant, et al., "Unrepeatered 2.4 Gbit/s Transmission Experiment Over 250 km of Step-Index Fibre Using Erbium Power Amplifier," Electronics Letters, vol. 26, No. 8, Apr. 12, 1990, pp. 528-530.
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General Instrument Corporation
Lipsitz Barry R.
Pascal Leslie
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