Optical waveguides – With optical coupler – Particular coupling function
Reexamination Certificate
2005-10-18
2005-10-18
Lee, John D. (Department: 2874)
Optical waveguides
With optical coupler
Particular coupling function
C385S015000, C385S147000
Reexamination Certificate
active
06956991
ABSTRACT:
In accordance with the invention, a variable delay line with continuous tuning comprises an optical path providing at least one continuous delay element coupled to a series of switchable binary fixed delays. The series of switchable delays can be configured to select a delay among a plurality of incremental delays, and the continuous delay can set a continuous delay in a range encompassing the delay increment of the binary series. In a preferred embodiment, the variable delay element comprises a tunable all pass filter (APF) with delay tunable from essentially 0 to a time T and the switchable binary fixed delays form a series (0,T), (0, 2T), (0, 4T), . . . , [0, (2n+1)], where n is an integer ≧0. The switches are preferably Mach-Zehnder switches. In an alternative embodiment, the continuous delay element comprises a suitable pair of APF arms. The path and all components can be fabricated as an integrated planar waveguide (solid state) device.
REFERENCES:
patent: 4934777 (1990-06-01), Jou et al.
patent: 5125051 (1992-06-01), Goutzoulis et al.
patent: 5943636 (1999-08-01), Baldwin et al.
patent: 6289151 (2001-09-01), Kazarinov et al.
Lee John D.
Lucent Technologies - Inc.
Stein James D.
LandOfFree
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