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公开(公告)号:JP2001343673A
公开(公告)日:2001-12-14
申请号:JP2001057526
申请日:2001-03-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor: HANSEN PER BANG , LEE ROBERT B , PARK SEO Y , REED WILLIAM ALFRED , STENTZ ANDREW J
Abstract: PROBLEM TO BE SOLVED: To avoid the instability of modulation and the effect of the four-wave mixing in a Raman-amplification optical transmission system. SOLUTION: A transmission fiber which is used in the Raman-amplification optical transmission system is constituted so as to exhibit specific characteristics for restricting the instability of modulation and the four-wave mixing in an amplification area and, as a result, noise constituting elements existing in the transmission system are reduced.
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公开(公告)号:CA2335891A1
公开(公告)日:2001-09-03
申请号:CA2335891
申请日:2001-02-13
Applicant: LUCENT TECHNOLOGIES INC
Inventor: STENTZ ANDREW JOHN , REED WILLIAM ALFRED , PARK SEO Y , LEE ROBERT B , HANSEN PER BANG
Abstract: A transmission fiber for use in a Raman amplified optical communication system is formed to exhibit certain characteristics that limit modulation instability and four-wave mixing in the amplification region, thus reducing the noise component present in the transmission system. In particular, the group-velocity dispersion (denoted as D and measured in terms of ps/nm-km) is restricted to be either non- positive or greater than +1.5ps/nm-km in the pump wavelength range of interest (a typica l pump wavelength range being 1430-1465nm). Preferably, the magnitude of the dispersion is kept below a value of 10 ps/nm-km in the signal wavelength range of interest (e.g., the "C" band or "L" band). Four-wave mixing is reduced by ensuring that the zero - dispersion frequency of the transmission fiber is not centered between the pump frequency and a frequency experiencing Raman gain.
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