Experimental study on optically band-limited 40-Gb/s RZ signals with optically time-division demultiplexing receiver

The impact of optical filtering on 40-Gb/s return-to-zero (RZ) signals was experimentally investigated with an optically time-division multiplexing (OTDM) receiver. Through the evaluation of the signal performance by changing the interpulse-phase conditions of the symmetrically band-limited 40-Gb/s signals, we have confirmed that similar performance was obtained regardless of the interpulse-phase condition, owing to the pulse-reshaping capability of an OTDM receiver. A performance comparison was also conducted between symmetrically and asymmetrically filtered 40-Gb/s RZ signals. It was found that the symmetrically filtered signal was more tolerant for the dispersion-compensation error, while the asymmetrically filtered signal was more tolerant for fiber nonlinearity with optical filters that have a 3-dB bandwidth of 45 GHz.

[2]  W. Idler,et al.  Vestigial side band demultiplexing for ultra high capacity (0.64 bit/s/Hz) transmission of 128/spl times/40 Gb/s channels , 2001, OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171).

[3]  H. Toba,et al.  40 Gbit/s L-band transmission experiment using SPM-tolerant carrier-suppressed RZ format , 1999 .

[4]  T. Hoshida,et al.  Requirement of filter characteristics for 40 Gbit/s-based DWDM systems , 2001, Proceedings 27th European Conference on Optical Communication (Cat. No.01TH8551).

[5]  I. Morita,et al.  Performance comparison between DSB and VSB signals in 20 Gbit/s-based ultra-long-haul WDM systems , 2001, OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171).

[6]  N. S. Bergano,et al.  Margin measurements in optical amplifier system , 1993, IEEE Photonics Technology Letters.

[7]  T. Miyakawa,et al.  2.56 Tbit/s (40 Gbit/s/spl times/64 WDM) unrepeatered 230 km transmission with 0.8 bit/s/Hz spectral efficiency using low-noise fiber Raman amplifier and 170 /spl mu/m/sup 2/-Aeff fiber , 2001, OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171).

[8]  A. Sano,et al.  320 Gbit/s (8/spl times/40 Gbit/s) WDM transmission over 367 km with 120 km repeater spacing using carrier-suppressed return-to-zero format , 1999 .