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We describe an erbium-fiber laser frequency comb that supports optical frequency synthesis at the millihertz level, or fractionally as 3×10−18 τ−1/2, by ensuring all critical fiber paths are within the servo-controlled feedback loop.
Supercontinuum generation in dispersion engineered silicon nitride waveguides is used to perform frequency comb metrology by measuring the relative stability of two cavity-referenced optical clock lasers at 3.8×10−15 at τ = 2 seconds.
The lowest phase noise microwave signals are now produced by photonic methods. This talk will describe some of these methods, with special attention given to optical frequency division.
We demonstrate an single branch Er:fiber laser for simultaneous access to all optical standards at NIST and that enables optical measurement instabilities at an unprecedented level of less than 4 × 10−18 at 1 s averaging time, and averaging down as τ−1/2.
We characterize high-power photodiodes under short pulse illumination for microwave generation. Photodetection limits the 10 GHz instability to 1.4 × 10−17 at 1 s, corresponding to 1/f phase noise of −135 dBc/Hz at 1 Hz.
Ultra-broadband laser frequency combs operating at multi-gigahertz repetition rate are important for applications in frequency metrology, as well as time-resolved and frequency-domain spectroscopy. A compact Ti:Sapphire laser (depicted in Fig. 1(a)) is a promising candidate for implementing such a frequency comb. Recently a 10 GHz self-referenced Ti:Sapphire was shown to provide an ultra-broadband...
We present the design of a novel, ultralow-phasenoise frequency synthesizer implemented with extremely-lownoise regenerative frequency dividers. This synthesizer generates eight outputs, viz. 1.6 GHz, 320 MHz, 160 MHz, 80 MHz, 40 MHz, 20 MHz, 10 MHz and 5 MHz for an 8 GHz input frequency. The residual single-sideband (SSB) phase noises of the synthesizer at 5 and 10 MHz outputs at 1 Hz offset from...
We demonstrate reduced photodetection noise floor of a 10 GHz fiber laser-based photonic microwave generator by using a pulse repetition-rate-multiplier in combination with a modified Uni-Traveling-Carrier (MUTC) photodiode that features high power handling and linearity. This enables a residual phase noise floor of −170 dBc/Hz at 10 GHz, which is a 5–25 dB improvement over earlier results. Photodiode...
We report modified uni-traveling carrier (MUTC) photodiodes with high power (22V peak RF amplitude and 18.7 dBm of 10 GHz RF power) and high phase linearity (AM-to-PM conversion factor of 0.3 [rad/(ΔP/P)]) in pulse mode operation.
The generation of microwaves from optical signals suffers from thermal and shot noise inherent in the photodetection process. This problem is more acute at lower pulse repetition rates where photodiode saturation limits the achievable signal-to-noise ratio. In this paper, we demonstrate a 10–15-dB reduction in the 10-GHz phase noise floor by multiplication of the pulse repetition rate. Starting with...
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