Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1998-02-26
2000-10-17
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359124, 359156, 359161, 359133, 359180, H04J 1406
Patent
active
061340332
ABSTRACT:
A method and apparatus is provided for transmitting an optical signal. The method includes the step of generating an optical signal that includes a plurality of optical channels, which are sequentially numbered from 1 to N from lowest to highest wavelength. A state-of-polarization of predetermined odd-numbered channels is oriented to be substantially orthogonal to a state of polarization of predetermined even-numbered channels by directing the predetermined odd-numbered channels and the predetermined even-numbered channels through orthogonally polarizing inputs of a polarization coupler. The odd-numbered channels and the even-numbered channels may be directed through first and second wavelength combiners, respectively, prior to orienting their states of polarization. The orthogonal relationship between the states of polarization of odd and even-numbered channels advantageously limits the four-wave mixing products that can be generated in the optical transmitter and the optical transmission path to which it is typically coupled.
REFERENCES:
patent: 5841557 (1998-11-01), Otsuka et al.
Bergano Neal S.
Davidson Carl R.
Negash Kinfe-Michael
Tyco Submarine Systems Ltd.
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