M. Goix

Demonstration of RSOA-based remote modulation at 2.5 and 5 Gbit/s for WDM PON

This paper investigates the performance of a reflective semiconductor optical amplifier in a bidirectional wavelength-division multiplexed passive optical network at 2.5 and 5 Gbit/s over 20 and 15 dB link budget.

dBm output power from an engineered cladding-pumped Yb-free EDFA for L-band WDM applications

We have demonstrated a saturated output power of +26 dBm with a cladding-pumped Yb-free erbium-doped fiber amplifier owing to the matching of the multimode pumps wavelength with the erbium absorption spectrum. These results corresponded to saturated output powers of +23 dBm with a single multimode module and +26 dBm with two sources used in combination. Moreover, in the flat-gain regime, an output power of +24 dBm has been obtained for only 1.76 W launched pump power. Since the amplifier incorporated only packaged devices, this will make its gain flatness characteristics and high output powers available soon for the next generations of high bit-rate WDM systems.

Tolerant low-loss three-lens coupling system for 1.48-μm unstable-cavity lasers

A 1.48-micrometer unstable-cavity laser is coupled into a single-mode fiber using three microlenses. Reproducible coupling of very high power is demonstrated with different types of lenses (plano-convex or bi-convex, with different apertures). Over 550 mW in single-mode fiber were reproducibly reached; to our knowledge, it is the highest power coupled into a single-mode fiber from a single semiconductor laser at this wavelength. Tolerance measurements on all of the coupling elements of a three-lens system are reported for the first time; an unexpected very large tolerance on the axial displacement of the second lens was measured. Results and interpretation with the aid of Gaussian and aberration simulations are also presented. Finally, we report on the first realization of a module with 46% chip to fiber coupling efficiency.

20 Gbit/s optically regenerated transmission over 40 mm based on polarisation-independent, push-pull InP Mach-Zehnder modulator

Validation of a new polarisation-independent InP Mach-Zehnder interferometer providing adjustable phase/intensity optical modulation as a soliton regenerator is made through loop experiments. Error-free 20 Gbit/s transmission over 40,000 km is obtained in push-pull mode to compare with 8,000 km under single-electrode control.