Methods and apparatus for Raman crosstalk reduction via idle...

Details Methods and apparatus for Raman crosstalk reduction via idle... Methods and apparatus for Raman crosstalk reduction via idle...

2004-12-28

2008-09-09

Leung, Christina Y (Department: 2613)

Optical communications

Transmitter

Including compensation

C398S081000, C398S159000

Reexamination Certificate

active

07424229

ABSTRACT:
Methods and apparatus are provided for reducing Raman crosstalk in a wavelength-division-multiplexing (WDM) optical fiber transmission system that transmits a multiplex of channels. Idle data is sent over one or more of the channels of the WDM system in order to maintain the optical link when user data is not being sent. The idle data has an idle data pattern, which can be controlled such that a power spectral density of a signal carried by at least one channel is shifted in order to reduce Raman crosstalk between the channels. For example, the power spectral density may be shifted away from lower frequencies of the channel, and toward the higher frequencies, by controlling the idle data pattern. Alternatively, the power spectral density may be shifted towards unused frequencies of the channel, by controlling the idle data pattern.

REFERENCES:
patent: 2006/0039699 (2006-02-01), Farmer et al.
Article by F.J. Effenberger, H. Ichibangase, H. Yamashita entitled “Advances in Broadband Passive Optical Networking (B-PON) Technologies,” (published in IEEE Communications Magazine, vol. 39, No. 12, pp. 118-124, Dec. 2001).
Presentation by Michael Aviles, Kerry Litvin, Jun Wang, Barry Colella, Frank J. Effenberger, Feng Tian entitled “Raman Crosstalk in Video Overlay PONs,”—13 pages (published in Optical Fiber Communications, Apr. 2004).

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