scholarly journals Optical phase-noise dynamics of Titanium:sapphire optical frequency combs

2014 ◽  
Vol 320 ◽  
pp. 84-87 ◽  
Author(s):  
Qudsia Quraishi ◽  
Scott A. Diddams ◽  
Leo Hollberg
Keyword(s):  
Phase Noise ◽  
Optical Frequency ◽  
Optical Frequency Combs ◽  
Optical Phase ◽  
Frequency Combs

scholarly journals Optical frequency combs for low phase noise microwave generation

2011 ◽  
Author(s):  
F. Quinlan ◽  
T. M. Fortier ◽  
M. S. Kirchner ◽  
J. A. Taylor ◽  
J. C. Bergquist ◽  
...  
Keyword(s):  
Phase Noise ◽  
Optical Frequency ◽  
Optical Frequency Combs ◽  
Microwave Generation ◽  
Frequency Combs ◽  
Low Phase Noise

scholarly journals Ultralow-noise microwave extraction from optical frequency combs using photocurrent pulse shaping with balanced photodetection

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Minji Hyun ◽  
Chan-Gi Jeon ◽  
Jungwon Kim
Keyword(s):  
Phase Noise ◽  
Pulse Shaping ◽  
Thermal Noise ◽  
Optical Power ◽  
High Peak Power ◽  
Optical Frequency ◽  
Optical Pulses ◽  
Noise Sources ◽  
Optical Frequency Combs ◽  
Frequency Combs

AbstractThe phase noise of microwaves extracted from optical frequency combs is fundamentally limited by thermal and shot noise, which is inherent in photodetection. Saturation of a photodiode due to the high peak power of ultrashort optical pulses, however, prohibits further scaling of white phase noise by increasing incident optical power. Here we demonstrate that the photocurrent pulse shaping via balanced photodetection, which is accomplished by replacing a single photodiode with a balanced photodetector (BPD) and delaying one of the optical pulses, provides a simple and efficient optical-to-electrical interface to increase achievable microwave power and reduces the corresponding thermal noise-limited phase noise by 6-dB. By analysing contributing noise sources, we also show that the thermal noise floor can reach − 166 dBc/Hz even at a low photocurrent of 2-mA (4-mW optical input per photodiode) when using a p-i-n BPD. This finding may be useful for on-chip microwave generation, which consists of standard p-i-n structure photodiodes with relatively low saturation optical power.

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