Abstract
This paper presents the performance assessment of dispersion supported transmission for two and three 10 Gbit/s channels separated 0.5 nm. The frequency utilization efficiency was doubled by using a three-mirror Fabry-Perot demultiplexer. Implications of Three-Mirror Fabry-Perot Demultiplexers for Dispersion Supported Transmission of Two and Three 10 Gbit/s Channels Separated 0.5 nm Mario M. Freire Department of Mathematics and Computer Science, University of Beira Interior Rua Marques d'Avila e Bolama, 6200 Covilha, Portugal Telephone: +351-75-314207, Fax: +351-75-26198 Alvaro M. F. de Carvalho and Henrique J. A. da Silva Department of Electrical Engineering, University of Coimbra Largo Marques de Pombal, 3030 Coimbra, Portugal Telephone: +351-39-20023, Fax: +351-39-35672 Single-channel optical transmission at 10 Gbit/s up to 253 km of standard singlemode fibre (SMF) has been demonstrated, using the method of dispersion supported transmission (DST) [1]. However, in a recent DST experiment at 20 Gbit/s, the link length was reduced to 53 km SMF [2], as expected from the principle of dispersion supported transmission [1]. One solution for high capacity DST on long spans of SMF is the optical transmission of wavelength division multiplexed (WDM) 10 Gbit/s channels. In [3], we have discussed the impact of single and double cavity Fabry-Perot demultiplexers on the performance of dispersion supported transmission of two WDM 10 Gbit/s channels separated 1nm. Nevertheless, to reduce the differences on the system performance due to a different value of fibre dispersion at the wavelength assigned to each channel, narrow channel spacings are required. In this paper, we present the performance assessment of dispersion supported transmission for two and three 10 Gbit/s WDM channels separated 0.5 nm. The channel spacing was reduced by the use of a three-mirror Fabry-Perot demultiplexer with frequency response very near of the second order Butterworth type. The system model used for simulation was briefly reported in [3], and includes a rate equation model for Quantum well lasers, the frequency responses of a standard singlemode fibre (SMF), of a three-mirror Fabry-Perot demultiplexer (TM-FPF), and of a PIN photodiode. The optical amplifiers (EDFAs) have been considered as linear. An RC lowpass filter was used to provide the 3-dB bandwidth required by the DST method, and the receiver sensitivity was estimated taking into account the signal-ASE, ASE-ASE and crosstalk-ASE beat noises, as in [3]. Fig. 1 shows the receiver sensitivity versus fibre length for multichannel dispersion supported transmission at 10 Gbit/s with a PRBS of 27-1 bits. As can be seen, for distances ranging from 100 to 315 km, the crosstalk penalty is less than 0.5 dB for two and three WDM channels. These results indicate that the use of three-mirror Fabry-Perot demultiplexers in WDM-DST systems doubles the frequency utilization efficiency for long distance transmission. Fibre length [km] S en si ti vi ty fo r ch an n el 2 [ d B m ] -35 -30 -25 -20 -15 -10 0 50 100 150 200 250 300 350 ch.2 (DST) ch.1 + ch.2 ch.1 + ch.2 + ch.3 Fig. 1. Receiver sensitivity for channel 2 versus fibre length, after transmission via SMF of one (single-channel DST), two, and three 10 Gbit/s WDM channels with 0.5 nm channel spacing.
Published Version
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