Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1998-12-22
2000-04-04
Ben, Loha
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359239, 359181, 359187, 359276, 385 2, 385 3, 372 12, 372 26, G02F 103, H04B 1004
Patent
active
060468386
ABSTRACT:
The bias point of an electro-optic modulator, such as an Mach-Zender modulator, is automatically controlled. A pilot signal, preferably two pilot tones at different frequencies, is applied to the modulator. The output of the modulator then contains various components resulting from the pilot signal. An error signal is generated, preferably coherently, based on one of these components, termed the pilot component, which preferably is located at the difference frequency of the two pilot tones. A bias signal which controls the bias point of the modulator is adjusted based on the error signal. The coherent generation of the error signal facilitates feedback loops based on phase and/or amplitude control and also supports locking the electro-optic modulator to a bias point with a preselected slope (either negatively or positively sloping).
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United Technologies Photonics, "Use of the UTP Bias Control Circuit", received Feb. 1998 in Mountain View, California, pp. 1-9.
Kou Abraham H.
Swenson Norman L.
Yee Ting K.
Ben Loha
Kestrel Solutions, Inc.
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