US 12,352,571 B2
In-situ residual intensity noise measurement method and system
Jan Amir Khan, Windsor, CT (US); and Vijay Ramareddy, Revere, MA (US)
Assigned to EMCORE CORPORATION, Alhambra, CA (US)
Filed by EMCORE Corporation, Alhambra, CA (US)
Filed on Aug. 11, 2022, as Appl. No. 17/819,102.
Claims priority of provisional application 63/260,151, filed on Aug. 11, 2021.
Prior Publication US 2023/0049259 A1, Feb. 16, 2023
Int. Cl. G01B 9/02055 (2022.01); G01B 9/02 (2022.01); G01B 9/02015 (2022.01); G01C 19/72 (2006.01)
CPC G01B 9/0207 (2013.01) [G01B 9/02024 (2013.01); G01B 9/02051 (2013.01); G01C 19/721 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method of determining residual intensity noise (RIN) of a sensor, comprising:
determining a first amplitude of a first harmonic of the sensor while a signal propagating through the sensor is modulated at a modulating frequency corresponding to twice an eigenfrequency of the sensor;
determining a second amplitude of a second harmonic of the sensor while the signal propagating through the sensor is modulated at the modulating frequency; and
determining the RIN of the sensor as a ratio of the first amplitude and the second amplitude.