The optical phase modulators are integrated into the laser frequency control and servo system of the laser ranging interferometer
, which is used in the metrology instrumentation of the two satellites.
To utilize this measured data as a seismic signal, we compensate the error to improve the interferometer
's accuracy .
Since it is possible to put optical components very close to each other, the air dead path error of the laser interferometer
is also negligible.
In the experiment, the HC-1550 is used as a measuring arm of a Mach-Zehnder interferometer
and the conventional SMF-28 is used as an isolated reference arm.
If, however, a gravitational wave arrives, it disturbs spacetime, stretching and squashing it, and causing the arms of the interferometer
alternately to lengthen and shorten.
separate light waves onto paths of different lengths and then recombine them, creating an interference pattern of alternating bright and dark fringes that moves whenever the path lengths change.
2 PRINCIPLE AND STRUCTURE OF THE SENSOR 2.1 Principle of the Fabry-Perot interferometer
Mavalvala worked with researchers at the US-based underground detectors Laser Interferometer
Gravitational-wave Observatory (LIGO) Laboratory to build sophisticated sensors to detect gravitational ripples created from the collision of two black holes some 1.3 billion years ago and had been hurtling through space to reach Earth on September 14, 2015.
It takes a very sensitive interferometer
to detect them, which is what makes LIGO amazing.
Similarly, the Michelson-Morley interferometer
measurements Cahill refers to in  were not developed to measure the speed of light, c, but to measure relative motion, v to a postulated luminiferous ether.
Again the gates are divided according to the interferometer
techniques such as ultra-high nonlinear interferometer
(UNI), sagnac interferometer
(SI), Michelson interferometer
(MI), Mach-Zehnder interferometer
(MZI), and delay interferometer
(DI) to implement the nonlinearity in SOA.