Journal
OPTICS LETTERS
Volume 48, Issue 15, Pages 4137-4140Publisher
Optica Publishing Group
DOI: 10.1364/OL.492230
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A tunable comb source is created by gain switching a three-sectioned photonic integrated circuit. The circuit consists of two mutually coupled lasers connected by a passive waveguide. Frequency combs are generated by gain switching the Fabry-Perot laser, resulting in line spacings ranging from 3.5 to 8 GHz. Despite the lack of on-chip optical isolation, the combs remain stable due to the short delay times inherent to on-chip integration, as revealed by numerical simulations using a delay-differential model.
A tunable comb source is demonstrated through gain switch-ing on a three-sectioned photonic integrated circuit (PIC). The PIC consists of two mutually coupled lasers connected by a passive waveguide. One of these is a tunable, two-section, single mode laser. The second laser is a simple Fabry-Perot cavity laser which can be phase-locked with the single mode laser via bidirectional coupling. Frequency combs are pro-duced by gain switching the Fabry-Perot laser by applying a high-power radio frequency signal. Combs are generated with line spacings ranging from 3.5 to 8 GHz. The on-chip bidirectional coupling causes the comb to also be generated in the two-section device. Despite the lack of on-chip optical isolation between the lasers, the resulting combs are sta-ble. Numerical simulations using a delay-differential model reproduce the results and reveal the important role played by the short delay times inherent to on-chip integration in this stability.
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