A simple design of multi-wavelength generation in the S-band region of the optical network transmission is proposed. The design consists of broad-band fiber Bragg grating (BB-FBG), which acts as a filter to enhance operation in the S-band region. A Sagnac loop mirror (SLM) is used to generate multiple wavelength oscillations in the ring cavity. The output consists of 60 lasing wavelengths oscillating simultaneously between 1464 nm and 1521 nm with a spacing of 0.92 nm and an output linewidth of 0.66 nm.
A linear cavity short wavelength band Brillouin/Erbium fiber laser (S-band BEFL) is demonstrated. The architecture utilizes a bi-directional oscillation provided by two optical circulators at both ends of the laser cavity. Therefore, the number of channel is higher in this BEFL compared with the ring-based S-band BEFL. A stable output laser comb with 11 channels was obtained with Brillouin and 980 nm pumps of 9.4 mW and 206.5 mW, respectively at around 1503 nm region. The BEFL has the potential to be used in the future dense wavelength division multiplexing communication system.
By controlling the polarization state of a simple ring erbium-doped fiber laser with photonics crystal fiber, polarization controller (PC) and tunable band-pass filter, this paper demonstrates stable operation of narrow spacing dual-wavelength fiber laser (DWFL). The flexibility of the tunable band-pass filter and PC allows the spacing tuning of the DWFL from 80 pm up to 600 pm. Such tuning ability offers flexibility in the application of DWFL, particularly in tunable microwave generation and radio over fiber. Throughout the experiment, the DWFL shows high power stability within 0.6 dB and wavelength shift of less than 10 pm. In addition to that, it also produces a narrow linewidth optical output of 3 pm with a high signal to noise ratio of more than 60 dB.
A passively Q-switched S-band fiber laser using Molybdenum Diselenide (MoSe) saturable absorber (SA) is proposed and demonstrated. The SA is fabricated by depositing MoSe onto two fiber ferrules using the drop-cast method before heating and connecting the two fiber ferrules to form the SA. The passively Q-switched fiber laser designed using the MoSe SA has an operational range of 1491.0-1502.0 nm. The output pulse train has a pulsewidth ranging from 2.0 μs to 1.0 μs and corresponding repetition rate of between 34.5 kHz and 90 kHz with increasing pump powers, as well as a signal-to-noise of about 35.97 dB. The peak performance of the proposed laser is between 1480.0 and 1490.0 nm, corresponding to the first peak gain region with the S-band.
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