A tunable single polarization Yb3+-doped fiber laser using 45° tilted fiber Bragg grating is demonstrated. It generates
high degree of polarization (>99.86%) 1.06μm laser with 25 nm wavelength tuning range. This 45° tilted fiber Bragg
grating was fabricated using a zero-order-nulled phase mask. It has a near constant polarization-dependent loss (PDL)
across a wide wavelength range (1030 to 1080 nm).
We propose a novel approach to increase the repetition rate of all-fiber Q-switched laser. This proposed ring cavity fiber
laser consists of a fiber Bragg grating (FBG) functions as the wavelength discriminator and a chirped FBG Fabry-Perot
(FP) etalon serve as the transmission filter inside the ring cavity. The Q-switching operation is achieved by periodically
tuning of the FP etalon and hence modulating the loss of the cavity. A numerical model is developed to simulate this
type fiber ring laser with consideration of FBGs' spectra. Our simulation shows that the repetition rate of the Q-switched
pulse can be increased by multiple times that depend on the tuning range and the bandwidth of the chirped FBG FP
etalon. Experimentally we achieved 14 kHz Q-switched pulses under 3.5 kHz PZT modulation frequency.
We develop a new model to simulate and analyze sidelobes' influence on the pulses characteristics and performance of
fiber Bragg grating-based Q-switched fiber laser. Our simulation results show that uniform fiber Bragg gratings with
sidelobes negatively affect the Q-switched fiber laser performance. Their sidelobes introduce undesired multi-peaks and
decrease the output pulses energy, while the apodized fiber Bragg grating with high sidelobe-suppression-ratio is able to
eliminate the multi-peaks effectively and generate higher energy pulses with smoother profile. Experimental work has
been conducted to validate the proposed model and verify the simulation results.
In this paper, we demonstrate a novel stabilization scheme of actively harmonically mode-locked Erbium-doped fiber lasers (ML-EDFLs) by using highly nonlinear fibers in the cavity. 2 and 4 wavelengths anchored on ITU-T standards with 100 GHz channel spacing are successfully generated without gain competition. The amplitude fluctuation and timing jitter are measured to be less than 1% and 100fs, respectively.
A meta-heuristic method to design Erbium-Doped Fiber Amplifier (EDFA) Module for Dense Wavelength Division Multiplexing (DWDM) Network is proposed. By combining Simulated annealing (SA) and coupled mode theory, we obtain a promising method for the design of Long Period Gratings (LPGs) based gain equalizer for EDFA module. In C-band from 1528.8nm to 1562.3nm, we get the EDFA gain fluctuation within 1.1dB.
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