Optical waveguides – With optical coupler – Input/output coupler
Patent
1995-11-01
1997-09-16
Healy, Brian
Optical waveguides
With optical coupler
Input/output coupler
385 9, 385 10, 385 14, 385 42, 385 43, 385131, 385 30, 372 43, 372 96, 372102, G02B 634, H01S 308
Patent
active
056689004
ABSTRACT:
Improvements in distributed feedback optical reflection filters are described. In particular, taper shapes for the optical reflection couplers are determined by a design method based on a variational optimization theory, to provide an out-of-band sidelobe suppression ratio of greater than -30 dB, and a reduced width of the filtered bandwidth for a specified side lobe suppression level. These filter characteristics were determined by specifying the interaction strength reflection function along the length of the coupler, by the design formula
REFERENCES:
patent: 4573163 (1986-02-01), Kaminow
patent: 4750801 (1988-06-01), Alferness
patent: 5091916 (1992-02-01), Cimini, Jr. et al.
patent: 5311539 (1994-05-01), Behfar-Rad et al.
patent: 5345466 (1994-09-01), Macomber
patent: 5517589 (1996-05-01), Takeuchi
Kogelnik et al., "Filter Response of Nonuniform Almost-Periodic Structures", The Bell System Technical Journal, vol. 55, No. 1, p. 109-126, (1976).
Alferness et al., "Filter Characteristics of Codirectionally Coupled Waveguides with Weighted Coupling", IEEE Journal of Quantum Electronics vol. QW-14, No. 11, pp. 843-847, Nov. 1978.
Alferness, "Optical directional couplers with weighted coupling", Appl. Phys. letters 35(3), pp. 260-263,Aug. 1, 1979.
Song et al., "Design of corrugated waveguide filters by the Gel'fand-Levitan-Marchenko inversescattering method", Optics Letters vol. 2, No. 11, pp. 1905-1915, Nov. 1985.
Little et al., "Synthesis of codirectional couplers with ultralow sidelobes and minimum bandwidth", Optics Letters, vol. 20, No. 11, pp. 1259-1261, Jun. 1, 1995.
Sakata,"Sidelobe suppression in grating-assisted wavelength-selective couplers", Optics Letters, vol. 17, No. 7, pp. 463-465, Apr. 1, 1992.
Song, "Proposal for acousto-optic tunable filters with near-ideal bandpass characteristics", Applied Optics, vol. 33, No. 25, pp. 1-3, 1994.
Winick, "Design of Grating-Assisted Waveguide couplers with Weighted Coupling", Journal of Lightwave Technology, vol. 9, No. 11, pp. 1481-1492, Nov. 1991.
Haus et al., "Coupled-Mode Theory of Optical Waveguides", Journal of Lightwave Technology, vol. LT-5, No. 1, pp. 16-23, Jan. 1987.
Little Brent
Wu Chi
Healy Brian
Northern Telecom Limited
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