362 research outputs found
Modelocked mid-infrared frequency combs in a silicon microresonator
Mid-infrared (mid-IR) frequency combs have broad applications in molecular
spectroscopy and chemical/biological sensing. Recently developed
microresonator-based combs in this wavelength regime could enable portable and
robust devices using a single-frequency pump field. Here, we report the first
demonstration of a modelocked microresonator-based frequency comb in the mid-IR
spanning 2.4 {\mu}m to 4.3 {\mu}m. We observe high pump-to-comb conversion
efficiency, in which 40% of the pump power is converted to the output comb
power. Utilizing an integrated PIN structure allows for tuning the silicon
microresonator and controling modelocking and cavity soliton formation,
simplifying the generation, monitoring and stabilization of mid-IR frequency
combs via free-carrier detection and control. Our results significantly advance
microresonator-based comb technology towards a portable and robust mid-IR
spectroscopic device that operates at low pump powers.Comment: 8 pages, 5 figure
High-Performance Silicon-Based Multiple Wavelength Source
We demonstrate a stable CMOS-compatible on-chip multiple-wavelength source by
filtering and modulating individual lines from a frequency comb generated by a
microring resonator optical parametric oscillator.. We show comb operation in a
low-noise state that is stable and usable for many hours. Bit-error rate
measurements demonstrate negligible power penalty from six independent
frequencies when compared to a tunable diode laser baseline. Open eye diagrams
confirm the fidelity of the 10 Gb/s data transmitted at the comb frequencies
and the suitability of this device for use as a fully integrated silicon-based
WDM source.Comment: 3 pages, 3 figure
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