High-frequency broadband laser phase noise cancellation using a delay line

Broadband phase noise suppression in a Yb-fiber frequency comb.

We report a simple technique to suppress high-frequency phase noise of a Yb-based fiber optical frequency comb using an active intensity noise servo. Out-of-loop measurements of the phase noise using an optical heterodyne beat with a cw laser show suppression of phase noise by ≥7 dB out to Fourier frequencies of 100 kHz with a unity-gain crossing of ∼700 kHz. These results are enabled by the st...

Broadband Microwave Negative Group Delay Transmission Line Phase Shifters

Ultra low frequency noise laser by locking to an optical fiber delay line

We report the frequency stabilization of an erbium-doped fiber distributedfeedback laser using an all-fiber based Michelson interferometer of large arm imbalance. The interferometer uses a 1 km SMF-28 optical fiber spool and an acousto optic modulator allowing heterodyne detection. The frequency noise power spectral density is reduced by more than 40 dB for Fourier frequencies ranging from 1 Hz...

Precisely controllable broadband frequency sweeps using a semiconductor laser in an optoelectronic phase-lock loop

We demonstrate the generation of wideband frequency sweeps using a semiconductor laser in an optoelectronic phase-lock loop. The rate of the optical frequency sweep is locked to and determined by the frequency of a reference electronic signal, leading to an agile, high coherence sweptfrequency source for laser ranging and 3-D imaging applications. Using a reference signal of constant frequency,...

Passive phase noise cancellation scheme.

We introduce a new method for reducing phase noise in oscillators, thereby improving their frequency precision. The noise reduction is realized by a passive device consisting of a pair of coupled nonlinear resonating elements that are driven parametrically by the output of a conventional oscillator at a frequency close to the sum of the linear mode frequencies. Above the threshold for parametri...