Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1994-07-08
1996-04-16
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
359189, H04B 1006
Patent
active
055085083
ABSTRACT:
An apparatus for converting a bipolar optical signal to a unipolar optical signal includes first and second photodetectors electrically coupled in series for receiving the bipolar optical signal. An electro-absorption modulator such as a self-linearized modulator, for example, is electrically coupled to the photodetectors. The modulator serves to transmit therethrough a portion of the power of an optical beam in an amount proportional to the power of the bipolar optical signal to form a transmitted beam. A constant current source is provided for supplying a current that shifts the power of the optical beam transmitted through the modulator by a predetermined amount, thus forming the desired unipolar optical signal.
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AT&T Corp.
Mayer Stuart H.
Nichols Steven L.
Westin Edward P.
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