Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2005-12-06
2005-12-06
Negash, Kinfe-Michael (Department: 2633)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S199200, C359S199200
Reexamination Certificate
active
06972880
ABSTRACT:
An apparatus for transmitting and receiving optical signals and which is independent of the optical transmission bit rate. The apparatus includes an optical transmitting unit and an optical receiving unit. The optical transmitting unit receives a clock signal and transmits an optical signal at a bit rate corresponding to the frequency of the clock signal. The optical receiving unit receives an optical signal, converts the received optical signal into an electrical signal and processes the electrical signal to be an electrical representation of the received optical signal. The optical receiving unit has frequency characteristics which are controllable in accordance with the frequency of the clock signal to control the processing of the electrical signal. For example, the optical receiving unit can include an amplifying unit which amplifies the electrical signal, wherein the gain and band of the amplifier are controllable in accordance with the frequency of the clock signal. Also, the optical receiving unit can include a filter for filtering the electrical signal, wherein the cut-off frequency of the filter is controllable in accordance with the frequency of the clock signal.
REFERENCES:
patent: 4473901 (1984-09-01), Jensen
patent: 5369520 (1994-11-01), Avramopoulos
patent: 5444561 (1995-08-01), Kaminishi
patent: 5594583 (1997-01-01), Devaux
patent: A-6-76194 (1994-03-01), None
patent: A-7-162020 (1995-06-01), None
English language Abstract of JP 03-195107, issued Aug. 26, 1991.
English language Abstract of JP 03-270504, issued Dec. 2, 1991.
English translation of “Notification of grounds of claim rejections” section of Japanese language Office Action, dated Feb. 25, 2003, in corresponding Japanese application 08-034457.
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