J.W. Sulhoff

Two-wavelength WDM analog CATV transmission with low cross talk

We report a two-wavelength WDM analog CATV transmission system with cross talk <-60 dBc at launched power of +9 dBm/wavelength, an improvement of 13 dB over previous results. We are able to achieve this result principally by reducing the channel spacing from 8.6 nm to 2.2 nm. In addition, contrary to expectations for SRS, we find significant reduction of the cross talk by applying a 2-GHz dithering tone to the laser.

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.

Time dependent perturbation theory and tones in cascaded erbium-doped fiber amplifier systems

The time dependent perturbation theory of the gain dynamics of erbium-doped fiber amplifiers (EDFAs) is presented in this paper. The perturbed output is expressed explicitly in terms of the input perturbation. The general theory is then applied to sinusoidal tones; the results agree well with the experiment.

System margin enhancement with Raman gain in multi-span WDM transmission

With the improvement of 4-dB system margin by distributed Raman gain, we demonstrate error-free transmission of 40 wavelength-division multiplexing (WDM) L-band channels with 50-GHz spacing at 10 Gbit/s over 5/spl times/120 km spans of dispersion-shifted fiber.

Ultra-dense terabit capacity WDM transmission in L-band

We report error-free transmission of 100 wavelength-division-multiplexed (WDM) 10 Gb/s channels with 25 GHz spacing over 400 km of non-zero dispersion shifted fiber. High spectral efficiency of 0.4 b/s/Hz was achieved combining distributed Raman and erbium-doped fiber amplifiers.

Signal power transients in optically amplified WDM ring networks

Summary form only given. In multiwavelength optical networks with wavelength add/drop (WAD), closed loops may be formed, which, with the erbium-doped fiber amplifiers (EDFAs) used to compensate the losses of network elements and fiber spans, can constitute ring laser cavities. Laser oscillations in the ring cavity, occurring if the round trip gain exceeds the loop loss, are expected to introduce additional noise and steal power from signal channels. Recently we reported that in such networks channels in service could suffer significant power penalties due to the ring laser oscillations. We believe we report the first experimental investigation of the time dependence of signal channel power in the event of channel loss due to link failure or network reconfiguration.

Dynamic behavior in L-band EDFA

We have measured the dynamic behavior of a two-stage L-Band EDFA. The response time constants are about 105 /spl mu/s and 260 /spl mu/s when one and seven out of eight channels were dropped accordingly and the amplifier was well saturated. These values were about four and five times larger than what were observed in a C-Band EDFA. The difference can be explained by the different intrinsic saturation power in these two bands.

Cascaded semiconductor optical amplifiers for transmission of 32 DWDM channels over 315 km

Cascaded semiconductor optical amplifiers are used as in-line amplifiers for error free transmission of 32 signal channels at 2.3 Gbit/s over 315 km of AllWave/sup TM/.

Long-Haul WDM Transmission Using 10 Gb/s Channels: A 160 Gb/s (16x10 Gb/s) 6,000 km Demonstration

Long-Haul Wavelength Division Multiplexing (WDM) transmission experiments that use Erbium-Doped Fiber-Amplifier (EDFA) repeaters have been reported using channel bitrates of 2.5 Gb/s to 20 Gb/s.