A single-longitudinal-mode erbium-doped fiber laser with a passive multiple-ring cavity (MRC) is proposed for the first time to the authors' knowledge. The laser is fundamentally structured by insertion of three different short ring cavities, which serve as mode filters, into the main cavity. When it is combined with a mode-restricting intracavity fiber Bragg grating, the MRC resonator ensures single-longitundinal-mode laser oscillation. The laser can successfully suppress side-mode frequencies of as much as 1 GHz and provide an output power of 23 mW with a side-mode suppression ratio of 51 dB at 1533 nm. The short-term linewidth of the laser output measured is ~2 kHz . The ability of this fiber laser to act as an AM transmitter source is also demonstrated.
SO17 lBJ, United KingdomBrillouin/erbium fiber lasers (BEFLs) have recently been demonstrated as a densely (10 GHz) spaced robust multiwavelength laser source operating at room temperature.' To date, lasing up to 30 wavelengths has been realized.' In this paper, we present a novel configuration of a BEFL, in which Brillouin gain is initiated by an Er3':Yb3+ fiber distributed feedback (DFB) laser in the ring cavity. The laser output features multiwavelength and bidirectional operation, with potential applications in Brillouin fiber-optic gyros3 as well as dense wavelength-division multiplexing In contrast to previous BEFLs that used external Brillouin pump signals, this laser uses a fiber DFB laser as the Brillouin pump, and the DFB laser is integrated into the resonator. The laser configuration is shown in Fig. 1, similar to the DFB ring all-fiber laser4 but with an additional erbium-doped fiber (EDF) and a single-mode fiber (SMF). The Er3+:Yb3+ fiber DFB laser5 in the ring cavity is pumped with a 980-nm master oscillator power amplifier (MOPA) through a WDM coupler. Clockwise (CW) and counterclockwise (CCW) signals from the DFB laser generate Brillouin gain at the Stokes frequency (-10.6 GHz) in an SMF in both directions. The stop bandwidth of the fiber grating for the DFB laser is
A parallel-type, dispersion compensating C+L band erbium-doped fiber amplifier/Raman fiber amplifier is constructed by sharing a common 1480-nm pump source. The gain spectra of C+L band are flattened by optimally dividing the pump power ratio to 1:29 for EDFA and RFA, respectively. In a signal input power of -20 dBm, the average gain is 14 dB for the C-band EDFA and 13.6 dB for the L-band RFA when a pump reflector is used to recycle the residual pump power in L-band. The noise figure value ranges from 4.6 to 6.5 dB and the polarization dependent gain is less than 0.14 dB.
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