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公开(公告)号：CA2381682A1
公开(公告)日：2002-11-23
申请号：CA2381682
申请日：2002-04-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： XU CHUNHUI , DINU MIHAELA , KNOX WAYNE HARVEY , STUART HOWARD ROY , GARCIA HERNANDO , KILPER DANIEL CHARLES
Abstract: An optical performance monitor (OPM), e.g., for use in an optical network. T he OPM may be configured to characterize one or more impairments in an optical signal modulated with data. The OPM has an optical autocorrelator configured to sample the autocorrelati on function of the optical signal, e.g., using two-photon absorption. Autocorrelation points at various bit delays independently or in combination with average optical power may be used to detect and/or quantify one or more of the following: loss of data modulation, signal contrast, puls e broadening, peak power fluctuations, timing jitter, and deviations from the pseudo-random character of data. In addition, the OPM may be configured to perform Fourier transformation based on the autocorrelation points to obtain corresponding spectral components. The spectral components may be used to detect and/or quantify one or more of chromatic dispersion, polarization mode dispersion, and misalignment of a pulse carver and data modulator. The OPM m ay be further configured to generate feedback, e.g., to network operators to improve netwo rk performance.
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公开(公告)号：DE602005000298T2
公开(公告)日：2007-07-05
申请号：DE602005000298
申请日：2005-07-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KILPER DANIEL CHARLES , RAGHAVAN NARASIMHAN , RICHEY ELIZABETH O , TAEGER SYDNEY A , WHITE CHRISTOPHER ALAN
Abstract: A channel-growth plan for an optical transmission system selects channels such that the transients that result in the channels that survive a network failure, such as an upstream fiber cut, are either minimized or effectively handled by some transient-control technique. In one embodiment, the growth plan may try to keep post-transient surviving channel total power gain equal to the pre-transient total power gain. Alternatively, the growth plan may try to distribute the surviving channels uniformly over the pre-transient channel-frequency range. Other manifestations are to keep (1) the average power of the surviving channels substantially equal to the average power of the pre-transient channels or (2) the average power of the post-transient surviving channels substantially equal to the power level of a specified channel. Transient-control can be balanced with conventional low-cost and high-performance goals to provide an effective hybrid channel-growth plan.
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公开(公告)号：DE602005000298D1
公开(公告)日：2007-01-11
申请号：DE602005000298
申请日：2005-07-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KILPER DANIEL CHARLES , RAGHAVAN NARASIMHAN , RICHEY ELIZABETH O , TAEGER SYDNEY A , WHITE CHRISTOPHER ALAN
Abstract: A channel-growth plan for an optical transmission system selects channels such that the transients that result in the channels that survive a network failure, such as an upstream fiber cut, are either minimized or effectively handled by some transient-control technique. In one embodiment, the growth plan may try to keep post-transient surviving channel total power gain equal to the pre-transient total power gain. Alternatively, the growth plan may try to distribute the surviving channels uniformly over the pre-transient channel-frequency range. Other manifestations are to keep (1) the average power of the surviving channels substantially equal to the average power of the pre-transient channels or (2) the average power of the post-transient surviving channels substantially equal to the power level of a specified channel. Transient-control can be balanced with conventional low-cost and high-performance goals to provide an effective hybrid channel-growth plan.
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公开(公告)号：DE602005009293D1
公开(公告)日：2008-10-09
申请号：DE602005009293
申请日：2005-07-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KILPER DANIEL CHARLES , MARTELL CLAUDE A , RAGHAVAN NARASIMHAN , SADLER DAVID A , WHITE CHRISTOPHER ALAN
Abstract: In an optical transmission system, operations of certain elements are adjusted in an individualized manner after detecting a change in the total optical power level corresponding to multiple optical channels in a link of the system in order to control transients in those channels. For example, in response to a sudden drop in the number of channels resulting from a fiber cut, the power levels of the optical pumps in a Raman amplifier in an OADM are adjusted to reduce transient gain errors in the surviving channels, where the adjustment to the pump power level for each different optical pump is a function of both the detected change in the total optical power level and at least one specified coefficient for that particular optical pump, in order to handle non-linearities in the response of the Raman amplifier to the sudden drop in the number of optical channels.
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