scholarly journals Phase noise characterization of a QD-based diode laser frequency comb

2017 ◽  
Vol 25 (14) ◽  
pp. 15890 ◽  
Author(s):  
Govind Vedala ◽  
Mustafa Al-Qadi ◽  
Maurice O’Sullivan ◽  
John Cartledge ◽  
Rongqing Hui
Keyword(s):  
Phase Noise ◽  
Diode Laser ◽  
Frequency Comb ◽  
Laser Frequency ◽  
Noise Characterization

Phase Noise Characterization of a 25-GHz-Spaced Optical Frequency Comb from a Phase-Modulated Laser

CLEO: 2013 ◽  
2013 ◽  
Author(s):  
A. Ishizawa ◽  
T. Nishikawa ◽  
A. Mizutori ◽  
H. Takara ◽  
A. Takada ◽  
...  
Keyword(s):  
Phase Noise ◽  
Frequency Comb ◽  
Optical Frequency Comb ◽  
Optical Frequency ◽  
Noise Characterization

scholarly journals Measuring and characterizing the line profile of HARPS with a laser frequency comb

2020 ◽  
Vol 645 ◽  
pp. A23
Author(s):  
F. Zhao ◽  
G. Lo Curto ◽  
L. Pasquini ◽  
J. I. González Hernández ◽  
J. R. De Medeiros ◽  
...  
Keyword(s):  
Line Profile ◽  
Frequency Comb ◽  
Laser Frequency ◽  
Line Intensities ◽  
Measured Position ◽  
Wavelength Scale ◽  
Spectral Line Profile ◽  
The Stability ◽  
A Charge

Aims. We study the 2D spectral line profile of the High Accuracy Radial Velocity Planet Searcher (HARPS), measuring its variation with position across the detector and with changing line intensity. The characterization of the line profile and its variations are important for achieving the precision of the wavelength scales of 10−10 or 3.0 cm s−1 necessary to detect Earth-twins in the habitable zone around solar-like stars. Methods. We used a laser frequency comb (LFC) with unresolved and unblended lines to probe the instrument line profile. We injected the LFC light – attenuated by various neutral density filters – into both the object and the reference fibres of HARPS, and we studied the variations of the line profiles with the line intensities. We applied moment analysis to measure the line positions, widths, and skewness as well as to characterize the line profile distortions induced by the spectrograph and detectors. Based on this, we established a model to correct for point spread function distortions by tracking the beam profiles in both fibres. Results. We demonstrate that the line profile varies with the position on the detector and as a function of line intensities. This is consistent with a charge transfer inefficiency effect on the HARPS detector. The estimate of the line position depends critically on the line profile, and therefore a change in the line amplitude effectively changes the measured position of the lines, affecting the stability of the wavelength scale of the instrument. We deduce and apply the correcting functions to re-calibrate and mitigate this effect, reducing it to a level consistent with photon noise.

scholarly journals Mathematical analysis for phase noise characterization of pulse modulation signal

2019 ◽  
Vol 1237 ◽  
pp. 022117
Author(s):  
Cuiling Peng ◽  
Xiaolong Chen ◽  
Huiting Huan ◽  
Fushun Nian ◽  
Baoguo Yang
Keyword(s):  
Phase Noise ◽  
Mathematical Analysis ◽  
Pulse Modulation ◽  
Modulation Signal ◽  
Noise Characterization

scholarly journals Vernier spectrometer using counterpropagating soliton microcombs

Science ◽  
2019 ◽  
Vol 363 (6430) ◽  
pp. 965-968 ◽  
Author(s):  
Qi-Fan Yang ◽  
Boqiang Shen ◽  
Heming Wang ◽  
Minh Tran ◽  
Zhewei Zhang ◽  
...  
Keyword(s):  
High Resolution ◽  
Relative Frequency ◽  
Frequency Comb ◽  
Laser Frequency ◽  
Dual Frequency ◽  
Molecular Absorption ◽  
Laser Tuning ◽  
Technical Simplification

Determination of laser frequency with high resolution under continuous and abrupt tuning conditions is important for sensing, spectroscopy, and communications. We show that a single microresonator provides rapid and broadband measurement of optical frequencies with a relative frequency precision comparable to that of conventional dual-frequency comb systems. Dual-locked counterpropagating solitons having slightly different repetition rates were used to implement a vernier spectrometer, which enabled characterization of laser tuning rates as high as 10 terahertz per second, broadly step-tuned lasers, multiline laser spectra, and molecular absorption lines. Besides providing a considerable technical simplification through the dual-locked solitons and enhanced capability for measurement of arbitrarily tuned sources, our results reveal possibilities for chip-scale spectrometers that exceed the performance of tabletop grating and interferometer-based devices.

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