A new nonlinear evolution equation including the vector nature of the electromagnetic field and the frequency variation of the mode profile is derived. A kind of new nonlinearity is demonstrated. Its magnitude is strongly dependent on the waveguide geometrical parameters, which will lead to a suppression of the Raman soliton self-frequency shift in a photonic crystal fiber with a tellurite subwavelength core. Our results can be supported by the detailed numerical simulations.
This paper designs and implements one kind of automatic mode-locked system. It can adjust a passively mode-locked
fiber laser to keep steady mode-locked states automatically. So the unsteadiness of traditional passively mode-locked
fiber laser can be avoided. The system transforms optical signals into electrical pulse signals and sends them into MCU
after processing. MCU calculates the frequency of the signals and judges the state of the output based on a quick
judgment algorithm. A high-speed comparator is used to check the signals and the comparison voltage can be adjusted to
improve the measuring accuracy. Then by controlling two polarization controllers at an angle of 45degrees to each other,
MCU extrudes the optical fibers to change the polarization until it gets proper mode-locked output. So the system can
continuously monitor the output signal and get it back to mode-locked states quickly and automatically. States of the
system can be displayed on the LCD and PC. The parameters of the steady mode-locked states can be stored into an
EEPROM so that the system will get into mode-locked states immediately next time. Actual experiments showed that,
for a 6.238MHz passively mode-locked fiber lasers, the system can get into steady mode-locked states automatically in
less than 90s after starting the system. The expected lock time can be reduced to less than 20s after follow up
improvements.
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