C. R. Davidson

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.

9000 km, 5 Gb/s NRZ Transmission Experiment Using 274 Erbium-Doped Fiber-Amplifiers

The next generation of undersea transmission systems will use Erbium-doped fiber amplifiers (EDFAs) to boost signals periodically as the signals travel across the world’s oceans[1] [2] AT&T and KDD have constructed a joint experiment to aid in the design of the first trans-Pacific optical amplifier cable[3] To date, straight line experiments have been reported up to 4500 km.[4] [5] This memorandum reports error- free performance at 5 Gb/s, through 9000 km of dispersion shifted fiber and 274 EDFAs.

40 Gb/s WDM Transmission of Eight 5 Gb/s Data Channels Over Transoceanic Distances using the Conventional NRZ Modulation Format

The transmission of many Wavelength Division Multiplexed (WDM) channels over transoceanic distances can be limited by the nonlinear interactions between channels. In this work the nonlinear interactions were suppressed by tailoring the chromatic dispersion of the transmission fiber1 and operating the system at low channel power. These techniques made possible the transmission of eight 5 Gb/s Non-Return-to-Zero (NRZ) channels over 8000 km for a total transmission capacity of 40 Gb/s.

1800 Gb/s transmission of one hundred and eighty 10 Gb/s WDM channels over 7000 km using the full EDFA C-band

One hundred and eighty 10 Gb/s WDM channels were transmitted over 7000 km in 43 nm of optical bandwidth with a maximum spectral efficiency of 0.4 (bits/s)/Hz. Error free performance was measured for all channels using an advanced error correcting code.

640 Gb/s transmission of sixty-four 10 Gb/s WDM channels over 7200 km with 0.33 (bits/s)/Hz spectral efficiency

Sixty-four 10 gb/s WDM channels were transmitted over 7200 km is a spectral bandwidth of 15.1 nm for a spectral efficiency of 0.33 (bits/s)Hz. Error free operation was achieved for all channels.

16QAM transmission with 5.2 bits/s/Hz spectral efficiency over transoceanic distance

We transmit 160 x 100 G PDM RZ 16 QAM channels with 5.2 bits/s/Hz spectral efficiency over 6,860 km. There are more than 3 billion 16 QAM symbols, i.e., 12 billion bits, processed in total. Using coded modulation and iterative decoding between a MAP decoder and an LDPC based FEC all channels are decoded with no remaining errors.

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.

A 9000 km 5 Gb/s and 21,000 km 2.4 Gb/s Feasibility Demonstration of Transoceanic EDFA Systems Using a Circulating Loop

The capacity of transoceanic undersea transmission systems can be greatly increased by using erbium-doped fiber amplifiers (EDFAs) as undersea repeaters. Of the many transmission ‘experiments that have been performed using EDFAs,[1] [2] [3] the longest distance achieved to date transported a 2.4 Gb/s signal through a 2,200 km fiber that contained 25 EDFAs spaced every 80 km.[1] Extending the transmission length-of these experiments would require a large amount of hardware. Therefore, we have chosen to show feasibility of transoceanic EDFA systems by measuring the bit error rate (BER) after multi-thousand kilometer transmission using a circulating loop.

2.56 Tb/s (256/spl times/10 Gb/s) transmission over 11,000 km using hybrid Raman/EDFAs with 80 nm of continuous bandwidth

Two hundred and fifty six 10 Gb/s WDM channels were transmitted over 11,000 km in 80 nm of continuous optical bandwidth of hybrid Raman/EDFA for the first time. Using FEC all channels were decoded error free.