D. Le Guen

Narrow band 1.02 Tbit/s (51/spl times/20 Gbit/s) soliton DWDM transmission over 1000 km of standard fiber with 100 km amplifier spans

1.02 Tbit/s (51-wavelength each at 20 Gbit/s) dense WDM (0.4 nm channel-spacing) soliton transmission over 1000 km of standard step-index fiber with 100 lan (21 dB loss) amplifier spans was successfully achieved for the first time.

Four-wave mixing in traveling-wave semiconductor laser amplifiers

Nondegenerate four-wave mixing (NDFWM) effects on simultaneous amplification of copropagating and counterpropagating waves with a frequency spacing of a few gigahertz in a 1.5- mu m nonresonant near traveling-wave semiconductor laser amplifier are discussed. Experimental results are in qualitative agreement with a theoretical model assuming the NDFWM process is mainly due to carrier pulsation produced by the beating of copropagating waves in the amplifier. The amplification of a phase-modulated wave is considered. Time-reversal properties of four-wave mixing are demonstrated. >

Narrow band 640 Gbit/s soliton WDM transmission over 1200 km of standard fibre with 100 km-21 dB amplifier spans

We achieved 640 Gbit/s (32/spl times/20 Gbit/s) soliton dense-WDM (0.4 nm channel-spacing) transmission over 1200 km with 100 km dispersion-compensated spans of standard step-index fibre.

Numerical and experimental investigation of power and wavelength margins for a 20-Gb/s dispersion-managed soliton transmission system on standard fiber

A good agreement has been found between numerical and experimental investigation of a 20-Gb/s dispersion-managed soliton transmission system on standard fiber. More than 6 dB of power margin over 30 nm has been obtained at 1100 km by improving the dispersion slope compensation and the prechirping.

Influence of extrinsic FM noise on laser diode linewidth measured by self-heterodyning

Abstract The relationship between low frequency fm-noise and linewidth of the light of monomode GaAlAs diode lasers has been studied. The linewidth has been determined directly by self-heterodyne measurements and indirectly from the noise level measured with an optical frequency discriminator. Level and shape of the frequency noise spectrum have been manipulated through the injection current and the effect upon the linewidth has been studied theoretically and experimentally. Good agreement has been found between the results of the linewidth and frequency noise measurements.

25 GHz spacing DWDM soliton transmission over 2000 km of SMF with 25 dB/span

A high-density dense wavelength multiplexing (DWDM) dispersion-managed soliton loop experiment at 10 Gbit/s per channel with 25 GHz spacing have been conducted over 100 km/ 25 dB spans of SMF. The 1500 km error-free transmission using EDFA was improved to 2100 km using hybrid Raman/EDFA amplification.

FM noise and linewidth reduction in a 1.5 μm InGaAsP DFB laser coupled to an external fiber resonator

Abstract We report linewidth measurements on a 1.5 μm distributed-feedback semiconductor laser coupled to an external single-mode fiber resonator. The laser linewidth has been reduced from 100 MHz to 150 kHz by weak optical feedback from a 40 cm long fiber resonator having a finesse of 22. FM noise spectrum measurements demonstrate that high linewidth reduction with damped resonant noise peaks can be achieved by using high finesse external resonators.

Experimental evidence of pseudo-periodical soliton propagation in dispersion-managed link

We present the first experimental evidence of pseudo-periodical soliton propagation in dispersion-managed link. It is shown that the prechirp is a key element for the control of nonlinearity as predicted by the theory. The aim of this study is to compare measured and predicted pulse evolution along a dispersion-managed link in the anomalous-dispersion regime using a recirculation loop with 100 km dispersion-compensated span of standard fiber. Simultaneous measurements of spectral width and chirp are performed for different values of prechirp.

Impact of the polarization mode dispersion on a field demonstration of 40 Gbit/s soliton transmission over 500 km

40-Gbit/s single-wavelength alternate polarization soliton field experiment was performed on a dispersion-shifted fiber installed cable 500 km long. Comparison with an equivalent fiber installed in laboratory showed that the main impairment was due to the polarization-mode dispersion.

Robustness of 40-Gbit/s, 8/spl times/100 km-span soliton transmission with respect to fiber dispersion map over amplification span

In this communication, we report a straight-line transmission experiment at 40 Gbit/s over 800 km without any in-line soliton control nor local dispersion management and with enhanced amplifier span to 100 km. Q factors >6.5 were measured at 800 km. Two fiber configurations were investigated for which the chromatic dispersion was respectively decreasing and increasing over the amplification span. The two dispersion maps, which correspond to two extreme cases in local fluctuations.