Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2007-02-13
2007-02-13
Tran, Dzung (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S149000
Reexamination Certificate
active
10320510
ABSTRACT:
The present invention propose an optical filter for filtering out at least a part of one of two spectral side-bands of a coded optical signal spectrum having a carrier wavelength, the first of said side-bands which is to be transmitted by said filter being called transmitted side-band, the second of said side-bands which is to be filtered out by said filter being called vestigial side-band, said optical filter having a transmission response in intensity, having a maximum value at a central filter wavelength distinct from said carrier wavelength and located in said transmitted side-band, and said response being divided into two parts, a first filter part associated to a wavelength region including said carrier wavelength, a second filter part associated to a wavelength region which does not include said carrier wavelength where at a given value of transmittance distinct from said maximum value, said second filter part has a filter width smaller than the filter width of said first filter part.
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Navarro J A et al: “Direct-modulation/direct-detection technology in multigigabit optical networks” Electrotechnical Conference, 1994, Proceedings., 7thMediterranean Antalya, Turkey Apr. 12-14, 1994, New York, NY, USA, IEEE Apr. 12, 1994, pp. 175-178, XP010130833.
Bigo Sebastien
Frignac Yann
Alcatel
Sughrue & Mion, PLLC
Tran Dzung
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