Optical waveguides – With optical coupler – Input/output coupler
Patent
1998-08-05
2000-06-06
Lee, John D.
Optical waveguides
With optical coupler
Input/output coupler
385 27, G02B 634
Patent
active
060729279
ABSTRACT:
In an optical filter formed with a grating whose refractive index fluctuates along an optical axis of an optical waveguide so as to reflect light in a predetermined wavelength band, assuming that a position in the grating area is defined by a positional coordinate value z which is standardized by -.pi. to .pi. in a light propagating direction, an amplitude .DELTA.n of refractive index changing width in z satisfies: ##EQU1## by use of predetermined parameters x.sub.1 and x.sub.2 and proportional constants k.sub.1 and k.sub.2, .DELTA.n monotonously increasing or decreasing depending on whether the expression -.pi..ltoreq.z.ltoreq.0 or 0.ltoreq.z.ltoreq..pi. is satisfied, respectively.
REFERENCES:
M.N. Zervas et al.: "Design of Apodised Linearly-Chirped Fibre Gratings for Optical Communications" 22nd European Conference on Optical Communication, vol. 3, Sep. 15-19 1996, pp. 233-236, XP002084740 OSLO, Norway.
Williams J A R et al: "Fiber Bragg Grating Fabrication for Dispersion Slope Compensation" IEEE Photonics Technology Letters, vol. 8, No. 9, Sep. 1996, pp. 1187-1189, XP000624871.
Atkinson D et al: "Numerical Study of 10-CM Chirped Grating Pairs for Dispersion Compensation at 10 GB/S Over 600 KM of Nondispersion Shifted Fiber" IEEE Photonics Technology Letters, vol. 8, No. 8, Aug. 1, 1996, pp. 1085-1087, XP000621662.
T.A. Strasser, et al. (UV-Induced Fiber Grating OADM Devices for Efficient Bandwidth Utilization, OFC '96, PD8) 1996 [No Month].
Harumoto Michiko
Iwashima Toru
Kang Juliana K.
Lee John D.
Sumitomo Electric Industries Ltd.
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