Lasers híbridos sintonizáveis com cavidade externa para aplicação em módulos ópticos coerentes.

Abstract

The present work aims to study and evaluate the performance of tunable hybrid external cavity lasers for applications in small format coherent optical modules, presenting and discussing results recently published in the specialized literature about the new hybrid laser technologies. In this sense, two tunable hybrid lasers using silicon (Si) and silica (SiO2) based cavities with ultra-wide tuning range were studied, and the feasibility of a high power, narrow linewidth, miniaturized tunable laser was discussed for pluggable coherent modules in small form factors, such as OSFP and QSFP-DD. The hybrid III–V/Si laser and III–V/SiO2 exhibit, according to the literature used, high fiber-coupled output power, without booster semiconductor optical amplifier (SOA), up to +13 dBm for III–V/Si and +10 dBm for III–V/SiO2, and tuning range of 95 nm and 66 nm, respectively over the C and L bands with side mode suppression ratio (SMSR) greater than 35 dB. The miniaturized tunable laser, on the other hand, achieved narrow linewidths (down to 60 kHz), SMSR larger than 50 dB, a broad tuning range (65 nm) and a high output power of 21.5 dBm across the C-band through the integration of a high power SOA. Moreover, it is presented and discussed an on-chip integrated sensor technology for accurate laser frequency control against SOA current changes or package temperature variations.