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US 4,372,643 AGranted
Standing-wave, velocity-matched gate
AssigneeBell Telephone Laboratories, Incorporated
InventorsPao-Lo P. Liu, Enrique A. Marcatili
Life of this patent
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Abstract
An ultrafast gate is produced by locally modulating the coupling along a pair of coupled wavepaths (11, 12) by means of a standing-wave electrical signal. By resolving the electrical signal into two, oppositely travelling waves propagating at the same velocity as the signal in the coupled wavepaths, it can be shown that the effect is to simulate an alternating .DELTA..beta. coupler. It is further shown that side lobes in the output signal can be reduced by tapering the coupling along the coupling interval.
Claims11
In combination, apparatus including:
- a pair of coupled optical wavepaths (11, 12 and 60, 61) and,
- means (20, 70), supportive of travelling electrical waves, for locally modulating the coupling between said wavepaths;
- Characterized in that said travelling wave means is terminated to produce a standing wave therealong.
Dependencies are inferred from the claim text.