Florence Leplingard

Determination of the impact of a quality of transmission estimator margin on the dimensioning of an optical network

The impact of the quality of transmission estimator margin on the prediction accuracy for a connection establishment in network planning is studied as a function of the knowledge of the actual chromatic dispersion map.

Modeling of multiwavelength Raman fiber lasers using a new and fast algorithm

We describe a numerical model for a multiwavelength Raman fiber laser. It uses an original algorithm which makes the model robust and fast. We show a comparison between simulated and measured Raman laser output powers, characterized by their slope efficiency and their threshold.

Experimental assessment of phospho-silicate fibers for three-wavelength (1427 nm, 1455 nm, 1480 nm) reconfigurable Raman lasers

A three-wavelength reconfigurable cascaded Raman laser has been demonstrated in a phospho-silicate fiber using two types of Raman shifts. This laser provides high slope efficiencies compared to germano-silicate fiber lasers and control of the output powers. It enables to reduce (a) Output Stokes powers and total power versus pump power (b) Output spectrum with equalized power at the three output wavelengths.

30dBm output power from a cladding pumped Yb free EDFA for L band applications

Several terabit/s per fiber are now regularly demonstrated [1] and will be commercially available soon. These high bit rates are achieved with wavelength-division-multiplexed (WDM) systems. The channels are located in both C-band (from λ = 1529nm to λ = 1561 nm) and L-band (λ = 1570nm to λ = 1603nm) windows. To increase the spans between amplifiers, it is still necessary to increase the power per-channel, which may result in high total amplifier output powers.

FWM-assisted Raman laser for second-order Raman pumping

By enabling four-wave-mixing process within the cavity, a new type of Raman fiber laser for second-order pumping applications is demonstrated, exhibiting high stability down to a few milliwatts for the seed (1428 nm).

Effect of band location on characteristics of distributed Raman amplification

The impact of attenuation spectrum and effective area of link fiber has been experimentally and numerically assessed regarding the required pump power and effective noise figure for the S-band compared to C-band and XL-bands. Compared to the C-band and XL-band, it is shown that 15% more pump power is required in the S-band compared to the C-band while 1 dB more is observed for the effective noise figure compared to the C-band. The XL-band offers better a noise figure (2 dB lower than in the S-band) with similar power performance. Indeed, the increase of effective area and decrease of material Raman coefficient with wavelength reduces the benefit brought by a lower attenuation coefficient. However, attenuation at the pump wavelength is paramount for the determination of the best noise figure. Installed fiber characteristics, particularly concerning possible bending loss in the XL-band, will finally determine the best suited solution.

Advanced Test-beds to Validate Physical Estimators in Heterogeneous Long Haul Transparent Optical Networks

The capacity growth driven by increasing traffic and the introduction of new devices and technologies has resulted in new functionalities in optical networks. The property of transparency enables compatibility between different system generations and the coexistence of multiple bit-rates without raising the global network cost. In a transparent network, the signals travel through many links and nodes without the need for opto-electronic regeneration, accumulating physical impairments. Therefore, standard point-to-point test-bed set-ups are no longer adequate to emulate signals propagating in transparent optical networks. New test-beds integrating the different heterogeneity cases due to the use of transparent cross-connects becomes necessary. In this paper, we present various test-bed realizations accounting for the following network heterogeneities: fiber link heterogeneity and neighbor changes while a signal propagates in the fiber. To be able to emulate such network heterogeneity, we present a double-loop set-up. Such a set-up is then used to assess the propagation results obtained by simulation and validate the quality of transmission (QoT) estimators.

Stability enhancement for dual-order Raman fiber lasers

A new laser regime for second-order pumping applications is described. Our laser is a dual-output-wavelength Raman fiber laser that generates a low-power first-order-pump line and a high-power second-order-pump line together. We demonstrate how using four-wave mixing combined to Raman gain in the laser cavity permits better stability of the first-order-pump laser line.

High-power (+24 dBm) double-clad erbium-doped fibre amplifier for WDM applications in the C-band (1528 nm-1562 nm)

Summary form only given. The per-channel line-rate of wavelength-division-multiplexed (WDM) systems operating in the C-band (from /spl lambda/=1528 nm to /spl lambda/=1562 nm) is going to be up-graded to 40 Gbit/s. Therefore, higher signal powers will be required and may result in a need for total amplifier output powers exceeding +23 dBm. Owing to a reduced multimode core diameter and an optimisation of the pump wavelength, a high power performance is demonstrated here in the C-band with an Yb-free cladding pumped EDFA compatible with broadband WDM applications.

Numerical modeling of four-wave mixing-assisted Raman fiber laser

We present a new numerical model of cascaded Raman fiber lasers that takes into account four-wave mixing. New operating conditions are found when the laser dispersion is properly tuned, in good agreement with experimental results.