Generalized resonant coupler filters
US5943457A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1998 |
| Grant date | Aug 24, 1999 |
| Priority date | — |
| Expiry date | Mar 24, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/2861
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A signal processing circuit, the signal processing circuit comprising first and second waveguides, a series of successive couplers C.sub.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.sub.k between successive couplers C.sub.k-1 and C.sub.k, the delay differentials .DELTA.L.sub.k not being all the same. The first and second waveguides preferably have delay differentials between successive directional couplers defined by EQU .beta..DELTA.L.sub.k =.beta.n.sub.k .DELTA.L+.PHI..sub.k where n.sub.k is a set of co-prime positive integers, .beta. is defined by .beta.+2.pi.n.sub.eff /.lambda., .DELTA.L is defined by .DELTA.L=c/n.sub.eff .DELTA.f, c is the speed of light in a vacuum, n.sub.eff is the effective refractive index of the conduit, .lambda. is a wavelength selected from a range of carrier wavelengths .lambda..sub.1 . . . .lambda..sub.NCh for which the add/drop multiplexer is resonant, .PHI..sub.k is a phase parameter between 0 and 2.pi., and .DELTA.f is a pre-selected spectral range of the resonant coupler
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.