Abstract

A 9-channel wavelength tunable single-mode laser array based on slots is presented. The fabricated laser array demonstrated a threshold current in a range of 19~21 mA with the SOA unbiased at 20°C under continuous wave condition. Stable single mode performances have been observed with side-mode suppression-ratio (SMSR) > 50 dB. The output power higher than 37 mW was obtained at the SOA injected current of 70 mA for all the 9 channels within the laser array. A wavelength quasi-continuous tuning range of about 27 nm has been achieved for the laser array with the temperature variations from 10°C to 45°C. This array platform is of a single growth and monolithically integrable. It can be easily fabricated by standard photolithography. In addition, it potentially removes the yield problem due to the uncertainty of the facet cleaving.

Highlights

  • Wavelength-tunable semiconductor lasers are key components for the future densewavelength division-multiplexed (DWDM) optical communication system

  • A 9-channel wavelength tunable single-mode laser array based on slots is presented

  • Stable single mode performances have been observed with side-mode suppression-ratio (SMSR) > 50 dB

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Summary

Introduction

Wavelength-tunable semiconductor lasers are key components for the future densewavelength division-multiplexed (DWDM) optical communication system. Compared with other types of tunable lasers, these kinds of lasers have advantages of stable laser performance without mode-hops Such a laser array based on buried DFB gratings has been reported with a narrow linewidth of 160 kHz over 40 nm tuning range [7], which makes it much more suitable for coherent communications systems. By introducing a group of slots into the surface of the ridge on one side of the laser cavity, we have successfully designed and demonstrated single mode lasers with side mode suppression ratio (SMSR) more than 50 dB [13,14] Such a laser has been demonstrated to integrate with an EA modulator using identical active layer (IAL) [15]. Results show that the fabricated laser array spans a discrete wavelength range from 1540 to 1563 nm with the side-mode suppression-ratio more than 50 dB for all the 9 channels within the array

Device structure
Device fabrication and characteristics
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