Fully self-referenced frequency comb consuming 5 Watts of electrical power

Abstract

We present a hybrid fiber/waveguide design for a 100-MHz frequency comb that is fully self-referenced and temperature controlled with less than 5 W of electrical power. Self-referencing is achieved by supercontinuum generation in a silicon nitride waveguide, which requires much lower pulse energies (~200 pJ) than with highly nonlinear fiber. These low-energy pulses are achieved with an erbium fiber oscillator/amplifier pumped by two 250-mW passively-cooled pump diodes that consume less than 5 W of electrical power. The temperature tuning of the oscillator, necessary to stabilize the repetition rate in the presence of environmental temperature changes, is achieved by resistive heating of a section of gold-palladium-coated fiber within the laser cavity. By heating only the small thermal mass of the fiber, the repetition rate is tuned over 4.2 kHz (corresponding to an effective temperature change of 4.2 °C) with a fast time constant of 0.5 s, at a low power consumption of 0.077 W/°C, compared to 2.5 W/°C in the conventional 200-MHz comb design.

arXiv commentUpdated manuscript and added journal information

References in corpus (6)

• Photonic Damascene Process for Integrated High-Q Microresonator Based Nonlinear Photonics
• Operation of an optically coherent frequency comb outside the metrology lab
• Ultra-low noise microwave generation with fiber-based optical frequency comb and application to atomic fountain clock
• Self-referenced frequency combs using high-efficiency silicon-nitride waveguides
• A compact, thermal noise limited reference cavity for ultra-low noise microwave generation
• Radiation Hardness of High-Q Silicon Nitride Microresonators for Space Compatible Integrated Optics

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