In the paper, we research frequency difference lock of two lasers. In the optical fiber Brillouin sensor, two beams of laser frequency stability around 11G to achieve stimulated Brillouin scattering or heterodyne detection. Currently, we mainly through the optical delay to implement the locking of the frequency difference in the Brillouin sense. through the electric field amplify circuit to improve lock accuracy and improve the system program.
A nanosecond-accuracy, scalable, multi-point time- and
frequency dissemination has been set up in an existing DWDM optical fiber
network spanning approximately 200 km, using the White Rabbit (WR) Precision
Time Protocol (PTP). Presented novelties in this paper are: a performance study
of 5 cascaded WR switches allowing a wide fan-out; reference delay compensation
ensuring that the time received by the user is synchronized with the reference
timescale within a few nanosecond offset; experiments with a master clock
priority algorithm for redundant operation and experimental results of
hold-over performance.
High stability microwave frequency distribution with optical fiber