Will Patterson

Transmission of 96×100G pre-filtered PDM-RZ-QPSK channels with 300% spectral efficiency over 10,608km and 400% spectral efficiency over 4,368km

We transmitted 96 × 100 G pre-filtered PDM-RZ-QPSK channels with 300% spectral efficiency over 10,608 km using 52 km spans of 150 μm2 fiber and simple single-stage EDFAs. We also achieved 400% spectral efficiency over 4,368 km using similar techniques.

RZ-DPSK field trial over 13,100 km of installed non slope-matched submarine fibers

This work presents the first field trial using the return-to-zero differential-phase-shift-keying (RZ-DPSK) modulation format. A 96/spl times/10-Gb/s RZ-DPSK field trial was conducted over a 13 100-km optical undersea path by double passing the installed 6550-km underwater link which was deployed with non-slope-matched submarine fibers. All channels performed with more than a 3-dB forward-error correction margin, including channels that accumulated over /spl plusmn/13 000ps/nm of dispersion. It is also shown that the RZ-DPSK format has similar residual dispersion and channel power tolerance for both slope-matched and non-slope-matched fibers. Furthermore, it is demonstrated that the chirped RZ-DPSK format could further improve system performance by 1-2 dB.

A DWDM demonstration of 3.73 Tb/s over 11,000 km using 373 RZ-DPSK channels at 10 Gb/s

We present the first multi-terabit/s transoceanic length transmission demonstration using the RZ-DPSK format at a 10 Gb/s channel data rate. Error-free performance for 373-10 Gb/s RZ-DPSK channels after 11,000 km was demonstrated.

112×112 Gb/s transmission over 9,360 km with channel spacing set to the baud rate (360% spectral efficiency)

We transmit 112×112 Gb/s pre-filtered PDM RZ-QPSK channels with 360% spectral efficiency over 9,360km with the channel spacing set to the baud rate. This results in a record spectral efficiency for transpacific distance.

20 Tbit/s capacity transmission over 6,860 km

We transmit 198x100G pre-filtered PDM-RZ-QPSK channels with 400% spectral efficiency over 6,860 km. We also show that 100G coherent nonlinear performance scales differently with distance on uncompensated dispersion maps than expected from direct-detection transmission.

Experimental comparison of the RZ-DPSK and NRZ-DPSK modulation formats

The RZ-DPSK and NRZ-DPSK modulation formats were experimentally compared using installed undersea fiber links. Our results show a 1-1.5 dB RZ benefit with optimized RZ modulation depth for both 25-GHz and 33-GHz spaced channels.

Improved Margin in Long-Haul 40 Gb/s Systems Using Bit-Synchronously Modulated RZ-DQPSK

We demonstrated a substantial improvement in FEC margin at 40 Gb/s using bit-synchronously modulated RZ-DQPSK. We transmitted 28×40 Gb/s CRZ-DQPSK channels over 6,550 km with ~2 dB of actual FEC margin, without any PMD compensation.

Long-haul 40 Gb/s RZ-DPSK transmission with long repeater spacing

40 Gb/s RZ-DPSK signals were successfully transmitted over 4,920 km with 110 km repeater spacing using only single stage C-band EDFAs. The performance of 40 Gb/s and 10 Gb/s RZ-DPSK was compared. Q-factor fluctuations are an issue for 40 Gb/s systems.

Transmission of 40 Gb/s WDM signals over 6,250 km of conventional NZ-DSF with >4 dB FEC margin

We successfully transmitted 18/spl times/40 Gb/s RZ-DPSK channels over 6,250 km of non-slope-matched-fibers with >4 dB FEC margin using dispersion-slope compensators at the receiver. We demonstrated that 40 Gb/s DPSK worked as well as 10 Gb/s RZ-OOK for the same spectral efficiency.

Spectral hole burning simulation and experimental verification in long-haul WDM systems

The effect of spectral hole burning on long-haul WDM systems was simulated and measured on installed transatlantic link. Changes in end-to-end system gain versus number and wavelength of channels were evaluated. Modeling results are in good agreement with experimental data.