A linear cavity Brillouin fiber laser (BFL) is proposed and demonstrated for multi-wavelength operation. The BFL uses a single mode fiber (SMF) as a non-linear gain medium and an optical circulator to generate a linear cavity resonator. Two couplers are used to inject the Brillouin Pump (BP) and tap the BFL output respectively. The effect of the coupler ratio on the BFL performance is studied by keeping constant the ratio of the first coupler and varying the ratio of the second coupler. 11 simultaneous lines with a line spacing of 0.8 nm are obtained at a BP of 11.7 dBm and a coupler ratio of 95:5. The laser output is stable at room temperature with 5 lines obtained at above -30 dBm, and has the largest signal to noise ratio observed at the remaining lines. The proposed BFL has the advantage of being able to operate at any wavelength and is only dependent on the available BP wavelength. Wavelength, nmPower, dBm

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We demonstrated the generation of a multiwavelength laser comb through two different ring cavity designs. The first design, a ring laser with Sagnac filter is being modified to produce a second design known as composite ring cavity. The ASE spectrum obtained from the composite ring cavity is sliced into more than 30 laser lines. From this comb, 22 laser lines are flattened under the 3 dB peak power fluctuation and 25 lines are flattened under the 10 dB peak power fluctuation. The 24 laser lines have a bandwidth value of 10.48 nm and for each of them, the average OSNR value is found to be at 24 dB. The OSNR value distribution among the laser lines is nearly uniform. However, the fineness obtained in this scheme is very low as 2.8.

We propose and experimentally demonstrate a triple-wavelength fiber ring laser using a semiconductor optical amplifier (SOA) in conjunction with an array waveguide grating (AWG). The experimental results show three lasing lines with an adjustable wavelength separation and a large optical signal-to-noise ratio under room temperature. The three channels operate at 1531.5 nm, 1532.3 nm and 1533.1 nm with a peak power above -23 dBm and optical signal to noise ratio above 30 dB at SOA drive current of 350 mA. By changing the ports of the AWG, the center wavelengths of the triple lasing lines can be changed and the wavelength separation between the lasing lines can also be changed. The proposed laser configuration has the advantages of a simple and compact structure, quad-wavelength operation and the system can be upgraded to generate more wavelengths.