Optical communications – Multiplex – Code division multiplexing
Reexamination Certificate
2006-02-24
2009-11-17
Bello, Agustin (Department: 2613)
Optical communications
Multiplex
Code division multiplexing
C398S078000, C398S089000, C398S098000
Reexamination Certificate
active
07620324
ABSTRACT:
An object of the present invention is to implement optical multiplexing transmission and reception in which an OCDM channel is added without changing the used wavelength bandwidth of the existing WDM channel or without changing the time slot allocated to the existing OTDM channel. Hence, one of the embodiments of the present invention is constituted as follows. The OCDM signal generation section generates an encoded optical pulse signal by encoding an optical pulse signal. The encoded optical pulse signal is inputted to the wavelength disperser and the time waveform of the encoded optical pulse signal is shaped to be outputted as a shaped and encoded optical pulse signal. The WDM signal generation section generates an optical wavelength division multiplexing signal. The OCDM signal extraction section decodes the OCDM reception signal by using the same code as the time-spreading/wavelength-hopping code for each channel and generates a decoded OCDM reception signal. The shaped and encoded optical pulse signal component that is contained in the decoded OCDM reception signal is restored by the inverse-wavelength disperser and a reproduced optical pulse signal is generated. Only the autocorrelation waveform component of the optical pulse signal constituting the OCDM transmission signal is extracted from the reproduced optical pulse signal by the first threshold value judgment section. In the WDM signal extraction section, the second threshold value judgment section extracts the WDM signal of each channel from the WDM reception signal.
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Kamijoh Takeshi
Minato Naoki
Bello Agustin
Burdett James R.
Oki Electric Industry Co. Ltd.
Venable LLP
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