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We demonstrate a switchable dual-wavelength synchronously pulsed fiber laser Q-switched by graphene saturable absorber. Wavelength-resolved studies on the output Q-switched pulses show that despite of large wavelength spacing up to 26 nm, the two Q-switched pulses at each individual wavelength can be temporally synchronized with per-pulse energy up to 70 nJ. Further experiments show that by adjusting...
We demonstrate a new direct-detection polarization-division-multiplexing modulation scheme without polarization tracking. This scheme reduces sensitivity to depolarization and exhibits less Q-factor fluctuations compared to conventional polarization-division-multiplexing.
Results of 14 krad/s endless polarization tracking experiments are presented. Wavelength (1520...1564 nm), temperature (0...70degC) and second, nominally fixed polarization were varied, and a 2.5Grad long polarization trajectory was tracked in 64 h. Mean/maximum polarization errors were les0.053/0.13 rad.
A novel independent component analysis based algorithm is proposed for polarization demultiplexing. It solves the converge-to-same-source problem of constant modulus algorithm while possesses similar polarization tracking capability.
We demonstrate an FPGA-based control system which compensates random polarization changes with a fluctuation speed of up to 12 krad/s. Endless and uninterruptible behavior is confirmed. The residual polarization mismatch remains below 0.16 rad.
Automatic endless polarisation control with a commercial LiNbO3 polarisation transformer is reported. The controller is able to track worst-case endless 5 krad/s polarisation rotations with maximum polarisation and intensity errors of 0.17 rad and 0.73%.
We have quantified the system margin afforded by polarization scrambling with a direct measurement of the errored events from a noise loaded FEC decoder. We have demonstrated a margin enhancement of 1.2 dB after 8,856 km transmission.
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