A simple dynamic polarization mode dispersion compensator

Roy, F.; Francia, C.; Bruyère, F.; Penninckx, D.

doi:10.1109/ofc.1999.767861

Cited by 57 publications

(18 citation statements)

References 5 publications

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“…Hence, to maximize , the optimal compensator position is the one that brings the global input PMD vector of the line plus compensator parallel to the ISOP : a compensation strategy that is well known in the literature [17]. Our objective is here to maximize the eye opening, as provided by the GCF, by acting on the PC so as to control the compensator eigenmode , as seen at the input.…”

Section: A Theorymentioning

confidence: 99%

“…The mathematical tool for such constrained maximization is the method of Lagrange multipliers. We build the function (17) and look for its unconstrained extrema by solving the gradient equation (18) Once a solution is obtained, the Lagrange multiplier is found by imposing that such solution satisfies the constraint . Recalling (6) and (7), the solution of (18) is (19) where the argument is omitted for brevity.…”

Section: Appendix Optimization Of the Eye Opening For The Single-stagmentioning

confidence: 99%

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A Change of Perspective on Single- and Double-Stage Optical PMD Compensation

Vannucci

Bononi

2008

J. Lightwave Technol.

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Abstract-We present a rigorous investigation on how to optimize the degrees of freedom of optical polarization mode dispersion (PMD) compensators composed of differential group delay sections and polarization controllers, up to two stages. The analytical treatment relies on the extracted Jones matrices of the transmission and compensation fibers. The analysis of a single-stage compensator with two degrees of freedom (fixed DGD) is based on the maximization of the eye opening, as provided by the generalized Chen formula. The outage probability is quantified through a fast semi-analytical technique. It is shown how the benefits of single-stage compensation are strongly reduced and can lead to outage events, when certain critical input states of polarization are launched into transmission fibers with strong eigenmodes depolarization (i.e., strong higher order PMD). Focusing on such transmission fibers and input configurations, a novel algorithm is introduced for controlling a double-stage compensator with five degrees of freedom. The algorithm is based on an ideal equalization of the transmission fiber at half the bit-rate, realized resorting to spherical geometry. To this aim, we show that the first compensator stage must be a PMF fiber with very large DGD, equal to the bit period, in order to compensate the most critical configurations associated with outage events.

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Section: A Theorymentioning

confidence: 99%

Section: Appendix Optimization Of the Eye Opening For The Single-stagmentioning

confidence: 99%

A Change of Perspective on Single- and Double-Stage Optical PMD Compensation

Vannucci

Bononi

2008

J. Lightwave Technol.

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“…However, polarization tracking is required in the system. Another method was reported to measure the DGD by monitoring the degree-of-polarization (DOP) of received signal [4,5]. This method is dependent on the pulse width of the signal and the DGD monitoring range is small for short pulses.…”

Section: Introductionmentioning

confidence: 99%

CD-insensitive PMD monitoring based on RF power measurement

Yang¹,

Chen²,

Cheng³

et al. 2011

Opt. Express

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Abstract:We propose and experimentally demonstrate a chromatic dispersion (CD)-insensitive first-order polarization mode dispersion (PMD) monitoring method based on radio-frequency (RF) power measurement. In high-speed (>10-GSym/s) transmission systems, a narrowband fiber Bragg grating (FBG) notch filter filters out the optical components at 10GHz away from the carrier. After square-law detection, the 10-GHz RF tone changes with PMD and is insensitive to CD, which can be used as a PMD monitoring signal. Compared with the monitoring techniques utilizing clock tone, the PMD measurement range is increased from 26.3-ps to 50-ps while the requirement of the bandwidth of photodetector is reduced from 19GHz to 10GHz in 19-Gsym/s systems. It is experimentally shown that this technique is efficient on CD-insensitive first-order PMD monitoring for 38-Gbit/s DQPSK and 57-Gbit/s D8PSK systems.

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“…Such compensators, in fact, are designed to compensate a single WDM channel independently of the others, in the linear regime of propagation. Most of them [2]- [4] typically use a polarization controller, a polarization-maintaining fiber (PMF) with a fixed delay, and a feedback control signal, e.g., the degree of polarization (DOP) [2] or a linear combination of spectral lines of the output signal [3], [4]. The optimum coupling condition between the line and the compensator is found by monitoring the feedback signal, which is assumed to change slowly on the PMD millisecond time scale.…”

mentioning

confidence: 99%

Degree of polarization degradation due to cross-phase modulation and its impact on polarization-mode dispersion compensators

Bononi

Vannucci

Orlandini

et al. 2003

J. Lightwave Technol.

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Abstract-A novel analytical model is proposed to predict the cross-phase modulation (XPM)-induced depolarization in a two-channel transmission system, in which the Stokes' vector of each channel rotates around a space-invariant pivot by a time-varying angle which depends on the total instantaneous optical power in the fiber, on the angle between pump and probe input Stokes' vectors, and on the walk-off between channels. The model leads to a simple formula of the probe degree of polarization (DOP) which is validated both by simulation and experiment. The model helps identify the key physical factors that determine the XPM-induced performance degradation of DOP-based first-order polarization-mode dispersion compensators, and experiments that quantify such degradation are presented.

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A simple dynamic polarization mode dispersion compensator

Cited by 57 publications

References 5 publications

A Change of Perspective on Single- and Double-Stage Optical PMD Compensation

A Change of Perspective on Single- and Double-Stage Optical PMD Compensation

CD-insensitive PMD monitoring based on RF power measurement

Degree of polarization degradation due to cross-phase modulation and its impact on polarization-mode dispersion compensators

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