Optical waveguides – With optical coupler – Plural
Reexamination Certificate
2005-05-31
2005-05-31
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
With optical coupler
Plural
C359S016000
Reexamination Certificate
active
06901184
ABSTRACT:
In order to reduce the effects of non-linear phenomena in WDM optical transmission networks, the optical carrier frequencies of the multiplex signals belong to a comb of frequencies that are spectrally spaced apart in irregular manner while nevertheless belonging to a chart of optical frequencies that are spectrally spaced apart in regular manner at a pitch df. These frequencies are selected in such a manner as to enable them to be dropped from the multiplexed signals by N respective periodic optical filtering operations having the same free spectrum interval (Df) equal to M.df, where M is an integer greater than or equal to N, the filtering operations enabling N consecutive frequencies to be dropped from the chart. In addition, the spacing between any pair of frequencies of the comb is different from any integer multiple greater than or equal to 1 of the free spectrum interval (Df).
REFERENCES:
patent: 6331907 (2001-12-01), Miyazaki et al.
patent: 6341022 (2002-01-01), Leclerc et al.
patent: 6392991 (2002-05-01), Yamamoto et al.
patent: 6587242 (2003-07-01), Shake et al.
patent: 2003/0165341 (2003-09-01), Bulow
patent: 2003/0170035 (2003-09-01), Kisaka et al.
patent: 0 849 968 (1998-06-01), None
patent: WO 99/45420 (1999-09-01), None
Xin Miao, “Unequally spaced channels for upgrading WDM system from 3-channel to 10-channel preserving no FWM corsstalk”, Optical Fiber Technology, Academic Press, London, US, vol. 4, No. 2, pp. 347-350, XP002080085.
F. Forghieri et al, “Reduction of Four-wave Mixing Crosstalk in WDM Systems Using Unequally Spaced Channels”, IEEE Photonics Technology Letters, IEEE, Inc. NY, US, vol. 6, No. 1, Jun. 1, 1994, pp. 754, 756, XP000457239.
Y. Hamazumi et al, “Experiments on 4 × 4 port optical path cross-connection with 8 × 2.5 gbit/s transportation employing unequal channel spacing”, OFC-96 Technical Digest, Feb. 25, 1996, pp. 263-264, XP010539982.
M. Fakumi et al, “Experimental Verification of Cascadability of 12 Channel × 2.5 Gb/s WDM Add/drop Multiplexer Employing Unequally-spaced Arrayed-waveguide Grating”, ECOC-96, vol. 4, Sep. 15, 1996, pp. 103-106, XP010303172.
Alcatel
Sughrue & Mion, PLLC
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