Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2005-09-06
2005-09-06
Sedighian, M. R. (Department: 2633)
Optical communications
Multiplex
Wavelength division or frequency division
C398S197000, C398S160000
Reexamination Certificate
active
06941075
ABSTRACT:
In a 32-channel wavelength division multiplexing optical transmission system, for example, four optical transmitters are grouped in eight groups. Each group is provided with a control optical transmitter. The control light transmitter regulates the level of a control light so that the total level of light transmitted from the corresponding group is equal to the total level of four signal lights. An optical transmission line of the above-mentioned system is normally regulated beforehand so that the wavelength characteristic of the following signal lights is flat when light at the total level of thirty-two signal lights in a predetermined range of wavelengths is transmitted. Therefore, in the system according to the invention, independent of the number of signal lights, the receive level of a signal light is unchangeable.
REFERENCES:
patent: 6426817 (2002-07-01), Tomita
patent: 6449074 (2002-09-01), Okano et al.
patent: 6522803 (2003-02-01), Nakajima et al.
patent: 11-252047 (1999-09-01), None
Michishita Yukio
Murakami Hiroaki
Leung Christina Y.
McGinn & Gibb PLLC
NEC Corporation
Sedighian M. R.
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