We have demonstrated automatic polarization control in a field tyial over I16 knt of SSMF with 16 channel DWDM (I00 GHz spacing) based on polarization multiplexed 2x40 Gbit/s NRZ signals for a total capacity of 1.28 Tbds afler FEC decoding.
We present simple analytical expressions which relate fiber grating group-delay ripples to system performance and allow the estimation of expected penalties. Experiments show excellent agreement with our theory. A WDM transmission experiment shows that the system performance can be drastically improved if the channels are slightly detuned in wavelength.
In trod uc ti onDispersion-compensating fiber bragg gratings (DCFBGs) are a promising alternative to dispersion compensating fiber in order to compensate chromatic dispersion [I]. . They exhibit low loss, low nonlinear effect, the capability to compensate higher order dispersion together with compactness and potentially low costs. However, the group delay response of these gratings exhibit undesirable oscillations called ripples. These are caused by residual multiple reflections due to imperfections resulting from the manufacturing process and are easily measured [2]. Using simulations the influence of the ripples on the system performance has been addressed by several authors [3, 41. In this paper we present the first analytical model that relates the group-delay ripple to system penalty. The derived expressions are based on arbitrary group-delay characteristics and the basic signal parameters, i. e. the pulse shape. The validity of the model is confirmed by penalty measurements on narrow band and broadband DCFBGs. System designers can use this model to specify tolerable group-delay ripples.The model predicts a strong wavelength dependence of the penalty. This is also confirmed by a 320 Gbit/s transmission experiment over 90 km of standard singlemode fiber compensated with a single 30 nm DCFBG module.
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