Coherent light generators – Particular beam control device – Modulation
Patent
1992-11-02
1994-06-21
Lee, John D.
Coherent light generators
Particular beam control device
Modulation
385 2, 385 3, H01S 313
Patent
active
053234065
ABSTRACT:
A Mach-Zehnder modulator (MZM), which divides a CW laser beam into two optical portions, is biased at a 180.degree. phase difference between the two optical portions. An RF signal and an LO signal are simultaneously applied to one of the optical portions of the laser beam to produce phase changes between the two optical portions. The two optical portions of the laser beam are then recombined into an optical output beam, which is detected by a photodetector. The photodetector generates a photocurrent, which contains a component at a beat frequency--i.e., the frequency difference between the RF and LO frequencies. The waveform of the photocurrent component at the beat frequency is substantially the same (except for amplitude and a fixed phase shift) as the waveform of the RF signal.
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patent: 5040865 (1991-08-01), Chen et al.
patent: 5109441 (1992-04-01), Glaab
patent: 5119447 (1992-06-01), Trisno
patent: 5148503 (1992-09-01), Skeie
patent: 5161206 (1992-11-01), Djupsjobacka
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Chang Peter H.
Coward James F.
Yee Ting K.
Feix Donald C.
Lee John D.
Morrissey John J.
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