Fabry—Pérot Laser Diode for WDM-PON with Temperature-Insensitive Laser Spectral Envelope

We propose a novel Fabry—Pérot laser diode with temperature-insensitive laser spectral envelope. By introducing a temperature-insensitive optical filter structure into the laser diode resonator, the laser spectral envelope shows substantially reduced temperature sensitivity.

1. Introduction

The deployment of Passive-Optical-Networks (PON) based on Wavelength-Division-Multiplexing (WDM) techniques have been considered as a suitable solution in order to satisfy the exponential increase of data traffic demand in access networks (fixed or mobile) [1]. To implement a cost-effective WDM-PON, the wavelength-locked Fabry-Pérot laser diode (F-P LD) was proposed as colorless transmitters [2]. However, the laser spectral envelope of the conventional F-P LD changes with temperature. This degrades the wavelength-locking efficiency, and as a result the noise of the output light increases and the output power of the F-P LD decreases [3]. Thus, the high temperature sensitivity of the wavelength-locked F-P LD degrades system performance. In this work, we propose a novel FP-LD with temperature-insensitive laser spectral envelope, which can serve as a temperature-insensitive WDM source.