H - Electricity – 04 – J
Patent
H - Electricity
04
J
H04J 14/02 (2006.01) G02B 6/12 (2006.01) G02B 6/26 (2006.01) G02B 6/28 (2006.01) H04J 1/02 (2006.01)
Patent
CA 2264356
A signal processing circuit, the signal processing circuit comprising first and second waveguides, a series of successive couplers C i between the first and second waveguides, the couplers being spaced from each other along the first and second waveguides, the first and second waveguides having a delay differential .DELTA.L k between successive couplers Ck-1 and C k, the delay differentials .DELTA.L k not being all the same. The first and second waveguides preferably have delay differentials between successive directional couplers defined by .beta..DELTA.L k = .beta.n k .DELTA.L+.PHI.k where n k is a set of co-prime positive integers, .beta. is defined by .beta.=2.pi.n eff/.lambda., .DELTA.L is defined by .DELTA.L=c/n eff .DELTA.f, c is the speed of light in a vacuum, n eff is the effective refractive index of the conduit, .lambda. is a wavelength selected from a range of carrier wavelengths .lambda.1 .....lambda.NCh for which the add/drop multiplexes is resonant, .PHI.k is a phase parameter between 0 and 2.pi., and .DELTA.f is a pre-selected spectral range of the resonant coupler.
Conradi Jan
Hayward Geoffrey
Telecommunications Research Laboratories
Thompson Lambert Llp
LandOfFree
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