Tham khảo tài liệu 'advances in optical and photonic devices 2011 part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Quantum Dot Photonic Devices and Their Material Fabrications 239 nm . Each of the central wavelengths is selected for the 100-GHz channel spacing of the AWG by using the discrete single-mode selection method of the QD-CML. Figure 9 b shows a typical eye diagram at ch. 2 after transmission. A clear eye opening at Gbps is observed after the transmission. Therefore the 1-ụm waveband with a transmission over a long-distance km single-mode HF is successfully 1-ụm waveband arrayed waveguide grating Fig. 8. Experimental set-up for testing the 1-ụm WDM photonic transport system. A 1-ụm waveband and single-mode selected quantum dot optical-frequency comb laser QD-CML was used for the light source. a 10 b E co D tr -10 -20 -30 -40 -50 -60 Arrayed-Waveguide Grating AWG for 1-micron waveband 100 GHz spacing Injection seeded Sb-based QD FP-LD Ch1 Ch2 Ch3 Ch4 1042 1043 1044 Wavelength nm -70 1041 After km transmission 1045 I o o o 0 Fig. 9. a Optical spectrum of and single-mode selected QD-CML after transmission of the holey fiber. b Eye opening of after transmission. 240 Advances in Optical and Photonic Devices achieved at four different wavelengths by using a wavelength-tunable discrete single-mode selected QD laser device. The 1-pm waveband AWG YDFAs and other passive devices are also important to construct the 1-pm waveband photonic transport system. From these results a WDM photonic transmission with a 100-GHz channel spacing can be realized in the 1-pm waveband by using the proposed methods. Additionally it is expected that the QD photonic devices such as a semiconductor laser fabricated on the GaAs wafer will become a powerful candidate to realize an ultra-broadband 1- to photonic transport system. 3. Quantum dot structure for advanced photonic devices In this section novel material systems of a QD structure are introduced for advanced photonic devices. The novel .
