Pulse-overlapped dispersion-managed data transmission and intrachannel four-wave mixing

Abstract

We show that strong overlap of adjacent pulses in dispersion-managed return-to-zero transmission reduces pulse-to-pulse interaction and timing jitter. The limiting factors for this pulse-overlapped transmission are the amplitude fluctuations and the ghost pulse generation induced by four-wave mixing between spectral components within a single channel.

Suppression intra-channel four-wave mixing by strong dispersion management in 160 Gb/s OTDM RZ 100 km transmission

“…IXPM shifts the mean frequency and leads to timing jitter, whereas IFWM brings about amplitude fluctuation via energy transfer and generation of ghost pulses in the zero bit slots, resulting in severe limitations to bandwidth efficiency. The chirped return-to-zero (RZ) pulses are less influenced by IXPM in strongly dispersion-managed lines because the input pulse broadens rapidly and the peak amplitudes become small in spite of the extremely large overlap [4,5]. Therefore, IFWM is the main obstacle for long-distance high-speed transmission.…”

“…Numerical studies have been carried out to understand how to reduce the impact of the amplitude fluctuation and ghost pulse generation induced by IFWM. However, the simulation bit rate has been 40 or 80 Gb/s, which is much [3][4][5][6][7][8][9][10]. Therefore, it is useful to experimentally study and verify strong dispersion management in the case of a 160 Gb/s OTDM RZ transmission system.…”

Efficient weakly-constrained codes for mitigation of patterning effects in Digital Communications

“…9781-4244-3941-6/09/$25.00 c 2009 IEEE A very important practical example of ISI in highbit-rate transmission (at channel rates higher than 40 Gbit/s) is the effect of intra-channel four-wave-mixing (ICFWM) [2,3] that leads to the generation of "ghost" pulses that cause performance degradation. In the case of transmission affected by ICFWM, the main contribution to the bit error rate comes from the ghost pulses that appear in logical-zero time slots surrounded by symmetric patterns of logical-ones.…”

Quantitative Experimental Study of Intrachannel Nonlinear Timing Jitter in a 10-Gb/s Terrestrial WDM Return-To-Zero System

“…N return-to-zero (RZ) optical communication systems, timing jitter induced by intrachannel nonlinear pulse-to-pulse interactions can cause significant performance degradation [1]. Studies have shown that the amount of timing jitter depends on the predispersion and postdispersion compensation and the dispersion map [2]- [8].…”

“…For the and cases, during transmission, the pulses are sufficiently broad so that the amplitude jitter due to selfphase modulation is small. On the other hand, unlike in some 40-Gb/s systems, the pulses within a channel do not overlap strongly enough during transmission to result in amplitude jitter due to intrachannel four-wave mixing [1], [8]. In the case, without precompensation, the amplitude jitter induced by selfphase modulation limits the system performance because the pulses have a narrow width and a large peak power where the average power is largest.…”