tailieunhanh - Advances in Optical Amplifiers Part 12

Tham khảo tài liệu 'advances in optical amplifiers part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 316 Advances in Optical Amplifiers Fig. 8. Switching on off any wavelength channels. In the third scenario we demonstrated that each wavelength channel can independently be switched on off. Starting from the multiwavelength laser output shown in Fig. 7 c and by removing the steering phase hologram associated to the second wavelength channel the latter was switched off and dropped out from the fiber ring while the other channels were kept intact as shown in Fig. 8 a . Similarly the third and the fourth wavelength channels were dropped as illustrated in Figs. 8 b and c by reconfiguring the phase hologram uploaded onto the Opto-VLSI processor. During the switching experiments the multiwavelength laser characteristics such as the output power level the power uniformity laser linewidth and SMSR were not affected. The above three scenarios demonstrate the capability of the multiwavelength laser to generate arbitrary wavelength channels via software leading to significant improvement in flexibility and reconfigurability compared to previously reported tunable multiwavelength laser demonstrators. Tunable Fibre Lasers Based on Optical Amplifiers and an Opto-VLSI Processor 317 Each wavelength channel exhibited very stable operation at room temperature whenever it was turned on for different periods of time ranging from a few hours to a few days. The measured maximum output power fluctuation was less than dB for a period of 2-hour observation. 7. Multi-port tunable fiber lasers In addition to its excellent tunability for both single-wavelength and multi-wavelength lasing the Opto-VLSI based approach provides a special capability of integrating many tunable single multi-wavelength fiber lasers into a same tuning system making it very competitive for commercialization. Fig. 9. The proposed multi-port tunable fiber laser structure. The proposed Opto-VLSI-based multi-port tunable fiber ring laser structure is shown in Fig. 9. It consists of N tunable fiber lasers .