Design theory of long-distance WDM dispersion-managed transmission system

This paper describes a novel design theory of long-distance wavelength divi sion multiplexed (WDM) dispersion-managed optical transmission systems. Ass uming that the transmission distance, bit rate, and number of WDM channels are initially known, we investigate the optimum dispersion allocation and i nput power per channel to achieve the minimum channel spacing. Based on the design guidelines for single-channel and multichannel systems, we establis h the optimal design strategy, Details of the design procedure are demonstr ated for 2,5-, 5-, and 10-Gb/s10 000 km WDM systems by using. computer simu lations. Next, we study the impact of the fiber dispersion slope on the usa ble wavelength span, and show that the attainable capacity of the represent ative 5-Gb/s 10 000 km WDM system employing the postcompensation scheme can not exceed 100 Gb/s, Finally, we propose several techniques to approach th e ultimate capacity of the WDM system and show that up to 1 This (200 x 5 G b/s) 10 000 km system can be implemented without utilizing the in-line disp ersion slope compensation scheme. We also discuss the 10 Gb/s-10000 km WDM system employing in-line dispersion slope compensation.