tailieunhanh - Advances in Lasers and Electro Optics Part 11

Tham khảo tài liệu 'advances in lasers and electro optics part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Photonic Millimeter-wave Generation and Distribution Techniques for Millimeter sub-millimeter Wave Radio Interferometer Telescope 485 Alwe n Ỹ Jn Arf e f 2f 2 n -TO i 2 Ỹ J2 1 Arf e2f2n f 7 2 n -TO The output optical intensity R 2 which is detected by a high-speed photo-mixer is expressed by Eq. 8. IR 2- Arw 2 Jo2 Arf cos2 B 2JỈ Arf sin2 -4 J 0 Arf J1 Arf siny cos sin2nfmt 2 2 J o Arf J 2 Arf cos2 B -Ji2 Arf sm2- cos 2 X 2nfmt 8 where the high-order components are neglected assuming ARF 1 and the high-order components are neglected. By using Taylor s expansion of Bessel function Eq. 9 is obtained. R 2 Alw 2 1 1 Arf 2 2 cos ỘB 2 Arf sin ỘB sin2nfmt 1 . . .2 . 2 I ARF I cos B cos 2 X 2nfmi 9 The intensities of the fundamental component sin 2n mt and the second-order harmonic cos 2 X 2nfmt can be controlled by the DC-bias 0B. The fundamental and second-order components are proportional to sin fiB and cos d respectively. The ratio between the average power and RF signal component depends largely on the conversion efficiency from light-waves to RF signals at the photo-mixer. The ratios for the fundamental and second-order components are expressed in Eqs. 10 11. D1 2Arf si1m 10 1 1 Arf cos D2 - F 2 cosa 11 1 1 Arf cos0B In the case of 0B n the even-order components in the output signal R including the carrier components e2n fo are suppressed and the average power R 2 is reduced to minimum of 486 Advances in Lasers and Electro Optics Arf 2 2 where the dominant components are first-order USBs and LSBs. In the case of ỘB 0 the odd-order components are suppressed and the dominant components are zero-order and second-order USBs and LSBs. Need for the high-extinction ratio modulator Three Mach-Zehnder structure LN-modulator can provide high-extinction ratio more than 55 dB modulation signals. Simulated signals are shown in Figs. 5 and 6. High-extinction Fig. 5. Simulated low extinction ratio 20 dB modulation signal. Optical spectrum left and micro wave spectrum right . .

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