Coherent light generators – Particular beam control device – Modulation
Patent
1995-05-01
1997-05-20
Davie, James W.
Coherent light generators
Particular beam control device
Modulation
372 26, H01S 310
Patent
active
056319169
ABSTRACT:
The invention discloses a method and an apparatus for optically transmitting a narrow-band optical signal beam having a sub-carrier frequency in the 20 to 300 GHz range. The apparatus has a semiconductor laser with a lasing cavity of length L. The length L preferably ranges from less than 1 mm to 10 mm, thereby defining the round-trip resonance frequency according to the following equation c/2 nL. The apparatus has a signal source for generating an electrical modulating signal having a modulation frequency contained in a narrow band containing the round-trip resonance frequency. An in-coupling means delivers the electrical modulating signal to the semiconductor laser which produces a sub-carrier modulated signal beam whose sub-carrier modulation frequency lies within a response band and corresponds to the modulation frequency. The apparatus further includes a biasing device for providing a biasing voltage for tuning the response band and the sub-carrier modulated signal beam. According to the method of the invention the biasing voltage is used to set the width of the response band and to set a phase shift in the sub-carrier modulated optical signal beam. Varying the biasing voltage thus allows to phase-modulate the sub-carrier modulated optical signal beam.
REFERENCES:
patent: 5311526 (1994-05-01), Garfinkel et al.
patent: 5325382 (1994-06-01), Emura et al.
patent: 5414552 (1995-05-01), Godil
Georges John B.
Lau Kam Y.
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