Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-08-19
1998-07-21
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359189, H04J 1408
Patent
active
057841853
ABSTRACT:
A receiver at a node in an optical network receives an optical clock signal and an OTDM datastream. A detector converts the clock signal to the electrical domain. A variable delay stage applies a selected delay to the clock signal in the electrical domain. A non-linear electro-optic modulator which may be an electro-absorption modulator, receives the OTDM datastream at its optical input. An electrical control input of the modulator is connected to the output of the variable delay stage. The electro-optic modulator outputs an OTDM channel selected by setting the delay of the variable delay stage. The variable delay stage may include a number of logic gates, particularly AND gates, connected between a pair of microstrip delay lines. The gates are controlled to provide different paths with different corresponding delay times for the clock signal.
REFERENCES:
patent: 4427895 (1984-01-01), Eng
patent: 4991975 (1991-02-01), Alferness et al.
patent: 5353143 (1994-10-01), Clarke
Patent Abstracts of Japan, vol. 009, No. 056 (E-302), 12 Mar. 1985 & JP 59 198033 A (Nippon Denshin Denwa Kosha), 9 Nov. 1984.
Lucek Julian K.
Moodie David G.
Pitcher Danny R.
Smith Kevin
Widdowson Terence
British Telecommunications public limited company
Negash Kinfe-Michael
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