scholarly journals Dependence of measured audio-band squeezing level on local oscillator intensity noise

2017 ◽  
Vol 25 (20) ◽  
pp. 24262 ◽  
Author(s):  
Wenhai Yang ◽  
Xiaoli Jin ◽  
Xudong Yu ◽  
Yaohui Zheng ◽  
Kunchi Peng
Keyword(s):  
Local Oscillator ◽  
Intensity Noise

scholarly journals Performance of Kramers–Kronig Receivers in the Presence of Local Oscillator Relative Intensity Noise

2019 ◽  
Vol 37 (13) ◽  
pp. 3035-3043 ◽  
Author(s):  
Wenting Yi ◽  
Zhe Li ◽  
M. Sezer Erkilinc ◽  
Domanic Lavery ◽  
Eric Sillekens ◽  
...  
Keyword(s):  
Relative Intensity ◽  
Local Oscillator ◽  
Relative Intensity Noise ◽  
Intensity Noise

scholarly journals Interferometers with Internal and External Phase Modulation: Experimental and Analytical Comparison

1995 ◽  
Vol 48 (6) ◽  
pp. 971 ◽  
Author(s):  
Andrew J Stevenson ◽  
Malcolm B Gray ◽  
Charles C Harb ◽  
David E McClelland ◽  
Hans-A Bachor
Keyword(s):  
Shot Noise ◽  
High Frequency ◽  
Phase Modulation ◽  
Low Frequency ◽  
Local Oscillator ◽  
Intensity Noise ◽  
Fringe Contrast ◽  
Limited Region ◽  
External Modulation ◽  
Frequency Phase

Optical intensity noise in a light source easily degrades the sensitivity of a shot-noise-limited interferometer which is directly detecting low frequency phase or displacement variations. In this paper we describe and compare two experimental methods in which we use high frequency optical phase modulation to shift low frequency phase signals in an interferometer to a shot noise limited region of the photocurrent spectrum. This phase modulation is applied either within the interferometer arms-internal modulation-or in a local oscillator beam tapped off the main interferometer and coherently recombined with the interferometer output-external modulation. he photocurrent is mixed electronically with the high frequency modulating waveform to extract the signal information free from laser intensity noise. In our experiments, we have been able to detect interferometrically low frequency signals with true shot-noise-limited sensitivity. We find, theoretically and experimentally, that the interferometric sensitivity achievable in each scheme depends critically on non-ideal factors, such as imperfect interferometric fringe contrast and electronic noise in the detectors or amplifiers. This paper examines the relative merits and operating requirements of both modulation schemes in practical interferometers.

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