Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-12-03
1999-06-08
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359173, 359161, H04B 1000
Patent
active
059108525
ABSTRACT:
An optical communication system is described which includes an optical source; an optical modulator, receiving a transmission signal having frequencies included within a signal band and adapted to emit a modulated optical signal of a predetermined optical bandwidth; an optical transmission line comprising an optical fiber portion; and an optical receiver adapted to receive the optical signal in the presence of a predetermined SNR in the signal band, measured in a 5 MHz band. The telecommunication system further comprises, optically connected between the optical modulator and the optical transmission line, a depolarizer comprising two polarization-maintaining optical fiber portions, optically connected with each other in such a manner that the respective polarization axes form an angle of 45.degree., in which the optical bandwidth, lengths and birefringence of the polarization-maintaining optical fibers are operatively selected so that the SNR at the receiver in the signal band does not differ more than 1 dB from the SNR at the receiver measured in a band of 5 MHz by substituting the optical fiber portion of the transmission line with a passive attenuator of same attenuation.
REFERENCES:
patent: 4572608 (1986-02-01), Mochizuki et al.
patent: 5477375 (1995-12-01), Korotky et al.
patent: 5729372 (1998-03-01), Terahara et al.
Fontana Flavio
Franzoso Federico
Ravasio Giuseppe
Zammarchi Claudio
Brooks L. P.
Negash Kinfe-Michael
Pirelli Cavi S.p.A.
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