B. Fernier

1.55 /spl mu/m DFB lasers with integrated spot size converters operating at 2.5 Gbit/s with modulated power over 20 mW for 180 km transmission

Low-divergence 1.55 /spl mu/m distributed feedback (DFB) lasers with spot-size converter were used to demonstrate <1.5 db penalty after 180 km transmission at a rate of 2.5 Gbit/s with peak power over 20 mW.

1.55 /spl mu/m high efficiency tapered DFB laser using UV 250 2-in technology process

We report on high external efficiency reduced far field divergence DFB laser emitting at 1.55 /spl mu/m. A high spatial resolution lithography is used to define the tapered section of the spot size converter integrated in the device. Thanks to suitable UV-250 contact lithography process, sub-micron patterns, 2-inch homogeneity, and run to run reproducibility is simultaneously achieved. 15/spl deg//spl times/15/spl deg/ front facet divergence is obtained allowing 3.6 dB coupling loss to an AR coated end-cleaved standard optical fibre. Threshold current as low as 11 mA and external efficiency up to 0.42 W/A at 25/spl deg/C have been measured on 500 /spl mu/m long lasers.

UV-250 patterning of sub-micron tapered active layers

This paper reports the first results on Fabry-Perot 1.3 /spl mu/m lasers with sub-micron tapered active layers defined using a UV-250 patterning technology in combination with conventional RIE processing of InP. Its implementation to the full 2 inch wafer process flow is of interest in low cost module fabrication. Short lasers (500 /spl mu/m) with low coupling loss (3.4 dB with end cleaved fiber) and high quantum efficiency (0.26 W/A at 85/spl deg/C) are demonstrated.

1.3 /spl mu/m tapered DFB lasers for isolator-free 2.5 Gbits all-optical networks

All-optical networks require low cost and high efficiency laser sources. We demonstrate floorless 2.5 Gbit/s transmission under 20 dB return loss with 1.3 /spl mu/m tapered lasers designed for optics-free, isolator-free modules with no temperature control.

2.5 Gbit/s error-floor free transmission with high extinction ratio using directly modulated 1.55 /spl mu/m tapered lasers

The emergence of a BER floor using a directly modulated laser is studied versus the modulation extinction ratio. A selection on efficiency leads to a 100% DFB yield for floor-free transmission at a high extinction ratio of 14 dB.

High-efficiency 1.3 /spl mu/m Fabry-Perot laser diode based on hydrogenated passive spot-size converter

We present recent developments on the fabrication process of Buried Ridge Stripe (BRS) Laser Diodes (LDs) integrated with a butt-coupled passive Spot Size Converter (SSC). Hydrogenation of the buried passive section has been successfully implemented on a 2-inch wafer technology. Hydrogenated SSC-BRS LDs exhibit excellent high temperature CW performances. Improvement of external efficiency (0.24 and 0.16 W/A respectively measured at 85/spl deg/C on hydrogenated and as-grown 500 /spl mu/m-long SSC devices) confirms that hydrogenation significantly reduces the free carrier optical absorption losses. Moreover, its long-term stability is demonstrated through 2000 hrs Automatic Power Control test.

200 km 2.5 Gbit/s transmission with low threshold 1.55 /spl mu/m partly gain-coupled DFB lasers

We present partly gain-coupled DFB lasers with a periodically etched active layer. Low threshold currents are reported 200 km NDSF transmission experiment at 2.5 Gb/s show very low penalty of 0.3 dB. We have fabricated and measured partly gain-coupled DFB lasers with periodically etched quantum-wells. The technology used was checked to be homogeneous and reproducible. Very low threshold currents are reported with a high singlemode yield. 200 km (NDSF) nondispersion shifted fibre transmission at 2.5 Gb/s was performed with a very low penalty.