Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2006-10-03
2006-10-03
Thompson, Timothy (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
C359S238000, C359S239000
Reexamination Certificate
active
07116460
ABSTRACT:
A modulator arrangement for modulating an optical signal using a quadrature phase shift key for use in an optical wavelength division multiplex (WDM) optical communications system comprising a laser (2) for producing an optical signal of a selected wavelength, which signal is split by a splitter (4), each part of said split signal being applied to a respective phase modulator (6, 8) each for which phase modulators is adapted to modulate the phase of the signal in dependence on a respective drive voltages. The phase of the output of at least one modulator (6) is shiftable at least in part by a phase shifter (10), the split signals being recombined by an optical recombiner (12) to form an optical phase shift key output, wherein the output power is monitored by a detector (20), the detector signal then being used to drive a feedback arrangement to control electrodes of the phase modulators (6, 8) and/or phase shifter (10).
REFERENCES:
patent: 3713042 (1973-01-01), Kinsel
patent: 4893352 (1990-01-01), Welford
patent: 6014248 (2000-01-01), Kobayashi et al.
patent: 6130859 (2000-10-01), Sonnenschein et al.
patent: 6671053 (2003-12-01), Euteneuer et al.
patent: 2004/0016874 (2004-01-01), Rao et al.
patent: 0 496 298 (1992-07-01), None
patent: 0 547 394 (1997-08-01), None
patent: 1 004 920 (2000-06-01), None
patent: 2 364 790 (2002-02-01), None
patent: 2 370 473 (2002-06-01), None
Cormack, I.G. et al.: “Practical measurement of femtosecond optical pulses using time-resolved optical gating”, Optics Communications, North-Holland Publishing Co. Amsterdam, NL, vol. 194, No. 4-6, Jul. 15, 2001, pp. 415-424 XP004306783, ISSN: 0030-4018.
Bookham Technology plc
Fang Jerry
Lahive & Cockfield LLP
Laurentano, Esq. Anthony A.
Thompson Timothy
LandOfFree
Modulation control does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Modulation control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modulation control will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3630309