Optical communications – Transmitter
Reexamination Certificate
2007-04-24
2007-04-24
Vanderpuye, Kenneth (Department: 2613)
Optical communications
Transmitter
C210S208000
Reexamination Certificate
active
10820628
ABSTRACT:
The data transmission apparatus for performing data communication based on optical transmission includes a transmitting unit for converting and sending electric communication data, which is to be transmitted, into optical communication data, and a photoelectric conversion circuit for receiving the optical communication data and converting the received optical communication data into electric communication data, wherein the photoelectric conversion circuit includes a photodiode for generating a current based on the optical communication data, and a variable current supply for subtracting a predetermined current from the current generated by the photodiode. In addition, a bias current of a laser diode of each transmitting unit is set to a current larger than a laser oscillation threshold current so as to reduce the deviation of a light emission delay time of each laser diode.
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Okayasu Toshiyuki
Ono Atsushi
Advantest Corporation
Malkowski Ken
Osha-Liang LLP
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