Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1998-06-30
2000-06-06
Epps, Georgia
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359187, 359188, 372 38, H01S 310, H04B 1004, H04B 1012, G02F 135
Patent
active
060726180
ABSTRACT:
A light transmitting apparatus is constructed such that a transmission data signal Sa is transmitted to a light emitting element 21 via a driving circuit 23 and a modulation circuit 24 of a control circuit 22. Signal light outputted therefrom is transmitted to a light transmission path via an optical fiber 27, an optical circulator 25 and an optical fiber 25. Stokes light (backward scattered light) produced due to stimulated Brollouin scattering is inputted to a photo detector 26 via a port P3 from a port P2 of the optical circulator 25. A detection signal Sb assuming a level corresponding to this light intensity is outputted to a modulation circuit 24 of the control circuit 22. When the level of the detection signal from the photo detector 26 increases, modulation on a driving current to the light emitting element 21 is effected so that an emission spectral width of the light emitting element 21 is enlarged, thus enlarging the emission spectral width of the light emitting element 21. As a result, a threshold value at which stimulated Brillouin scattering occurs is set high, and a quantity of generation of stokes light can be reduced. With a simple construction, the backward scattered light produced due to the stimulated Brillouin scattering can be surely suppressed, whereby a quality of data transmission is enhanced and long-distance optical communications can be carried out.
REFERENCES:
patent: 5715265 (1996-09-01), Epworth
Burke Margaret
Epps Georgia
NEC Corporation
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