Abstract
We investigate the effect of a ring resonator on the linewidth and output spectrum of monolithically integrated extended cavity multi-section DBR lasers with an intra-cavity ring resonator. The goal is to achieve an understanding of whether and how the use of an additional ring filter improves the performance of a DBR laser on the aspects of the SMSR and intrinsic linewidth using the capabilities of the InP active-passive integration platform. The laser output spectrum is in good agreement with our theoretical calculations from a steady-state spectral model. A side-mode suppression ratio between 60 and 70 dB is measured for a range of operating semiconductor optical amplifier currents. The frequency noise power spectral density is measured for a range of output power levels. A minimum intrinsic linewidth of 63 kHz is reported. We compare the measured Lorentzian linewidths with our theoretical expectations and present estimates of the possible linewidth improvement with the available photonic integration technology used in this work.
Highlights
In recent years semiconductor continuous wave (CW) narrow linewidth lasers have become increasingly important
We investigate the effect of a ring resonator on the linewidth and output spectrum of monolithically integrated extended cavity multi-section distributed Bragg reflector (DBR) lasers with an intra-cavity ring resonator
The goal is to achieve an understanding of whether and how the use of an additional ring filter improves the performance of a DBR laser on the aspects of the side-mode suppression ratio (SMSR) and intrinsic linewidth using the capabilities of the InP active-passive integration platform
Summary
In recent years semiconductor continuous wave (CW) narrow linewidth lasers have become increasingly important. In this paper we are investigating the use of an intra-cavity ring filter to improve the spectral output of laser realized in a monolithic photonic integration platform. We achieve this without significantly increasing the laser footprint. Experimental results and analysis of the spectral output and frequency noise power spectral density of monolithically integrated extended cavity lasers with two DBR sections and a single intra-cavity ring resonator.
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