Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-03-19
1998-03-10
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359161, 359158, 359187, H04B 1004
Patent
active
057267898
ABSTRACT:
A device for modulating optical short pulses, while preventing a pulse compression optical fiber from degradation of the transmission characteristics even if the length of the pulse compression optical fiber varies, utilizes an optical short pulse generator 1, a pulse compression optical fiber 2, an optical divider 3, a photodetector 6, an amplifier 7, a band pass filter 8, a phase comparator 9, a loop filter 11, and a driving signal generator 12. The loop which comprises loop filter 11 and driving signal generator 12 controls an oscillation frequency in a VCO 12-1 so that the phase of a compressed optical pulse fed to an optical intensity modulator 4 is identical to the phase of a data signal that is synchronized with a reference clock and used to modulate the compressed optical pulse. In this manner, the extinction ratio of the modulation output is not degraded even if the length of the pulse compression optical fiber 2 varies due to ambient temperature variations.
REFERENCES:
patent: 5099471 (1992-03-01), Tsukada et al.
patent: 5513030 (1996-04-01), Epworth
patent: 5574588 (1996-11-01), Kawanishi et al.
Horiuchi Yukio
Suzuki Masatoshi
Kokusai Denshin Denwa Kabushiki Kaisha
Negash Kinfe-Michael
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