基于fpga的chirp通信系统的调制与解调技术毕业设计(编辑修改稿)

基于fpga的chirp通信系统的调制与解调技术毕业设计(编辑修改稿)内容摘要：

respectively. The relative performance of the transmitter modules are similar to that observed in the case of 10Gbps shown in Fig. 7. Chirp parameter of , − and − optimizes 40Gbps NRZ Duobinary transmission for the three transmitter modules as reported in Fig. 9. The qualitative behavior remains same at 40Gbps also where T1 performs significantly better than T2 and T3. T3, which outperforms T 2, can provide parable performance to T1 at much higher value of extinction ratio. Fig. 6. Comparison of 40 Gbps RZ duobinary transmitter modules 桂林电子科技大 学毕业 设计（论文）报告用纸 第 7 页 共 29 页 Fig. 7. Comparison of 10 Gbps NRZ duobinary transmitter modules. Fig. 8. Comparison of 20Gbps NRZ duobinary transmitter modules. Fig. 9. Comparison of 40Gbps NRZ duobinary transmitter modules. V. Conclusion This paper pares different transmitter modules for 10Gbps, 20Gbps and 40Gbps RZ and NRZ duobinary transmission to investigate the value of chirp and extinction ratio of the modulator that provides optimum performance. Analysis reveals that for 10Gbps and 20Gbps RZ duobinary at 20 dB extinction ratio, delayandadd circuit based transmitter performs better than other two. At 40Gbps, single arm MZIM in a delayandadd circuit based transmitter provides parable performance to a dual arm MZIM at relatively higher extinction ratio. Hence, for RZ duobinary, with optimal selection of modulator chirp and extinction ratio, a delayandadd circuit based single arm MZIM can replace a dualarm MZIM. For NRZ duobinary at 10Gbps, 20Gbps and 40Gbps, duobinary filter based 桂林电子科技大 学毕业 设计（论文）报告用纸 第 8 页 共 29 页 transmitter performs better than delayandadd circuit based transmitter and hence, a dual arm MZIM can be replaced with negligible penalty in Q factor. VI. Acknowledgement Authors are thankful to the Director, Pilani for extending the facility in the optical munication lab to implement the concept. VII. References [1] S. Walklin, J. Conradi, On the relationship between chromatic dispersion and transmitter filter response in duobinary optical munication systems, Photon. Technol. Lett. 9 (1997) 1005– 1007. [2] W. Kaiser, M. Wichers, T. Wuth, W. Rosenkranz, C. Scheerer, C. Glingener, A. F228。 rbert, . Elbers, G. Fischer:, SPMlimit of duobinary transmission, in: Proc. ECOC, Munich, Sep. 3– 7, Paper , 20xx. [3] L. Pierre, . Thiery, D. Penninckx, 243 km, 10 Gbit/s transmission experiment through standard fibre and impact of self phase modulation using partial response scheme, Electron. 32 (March (7)) (1996) 673– 674. [4] M. Lax, Rate equations and amplitude noise, IEEE J. Quantum Electron. 3 (1967) 37– 46. [5] . Agrawal, Nonlinear Fiber Optics, Academic Press, New York, 1989. [6] . Agrawal, FiberOptic Communication Systems, Wiley, New York, 20xx. [7] . Kaminow, T. Li, Optical Fiber Communication, vol. IVA, Academic Press, Elsevier Science, San Diego, CA/New York, 20xx. [8] T. Kawanishi, T. Sakamoto, M. lzutsu, Highspeed control of lightwave amplitude, phase, and frequency by use of electrooptic effect, IEEE J. Selected Top. Quantum Electron. 13 (20xx) 93– 103. [9] . Binh, Optical Fiber Communication Systems: Overview of Modeling Techniques for Optical Transmission Systems, CRC Press, 20xx. [10] W. Kaiser, T. Wuth, M. Wichers, W. Rosenkranz, Reduced plexity optical duobinary 10 Gb/s transmitter setup resulting in an increased transmission distance, Photon. Technol. Lett. (20xx). [11] . Lee, . Messerschmitt, Digital Communication 2/e, Kluwer Academic Publishers, Norwell, MA, USA, 1994. 桂林电子科技大 学毕业 设计（论文）报告用纸 第 9 页 共 29 页 Transmission performance on frequency response of receivers and chirping shape of transmitters for 10Gb ⁄ s LiNbO3 modulator based lightwave systems AbstractWe report transmission performance depending on frequency response of receivers and chirping shape of transmitters for10Gb ⁄ s LiNbO3 modulator based light wave systems. By solving the nonlinear Schrodinger equation including developed chirping and extinction ratio(ε) models for transmitters, and frequency response and noises for receivers, we have evaluated transmission performance by bit error rate ( BER ). and eye opening penalty ( EOP ). Calculated BER and EOP characteristics are pared to the measured BER characteristics so that we can find which bination between chirping model and frequency response for receivers is the best model to estimate the tendency in sensitivity degradation similar to the measured BER characteristics. The simulation results suggest that calculated BER characteristics using the Bessel–Thomson filter as a receiver frequency response model provide better prediction to estimate system performance. Furthermore, different chirping models may be used for positive and negative chirp parameters for better estimation of BER. 1 Introduction As current optical transmission systems are being more and more plex, and demand for munication services is growing at a higher speed than ever experienced before, simulation tools can provide efficient and fast system design, and therefore systems are implemented with less time and cost. So, many papers have been reported about light wave system simulations [1–10]. In highspeed optical transmission system, intensity modulated pulse is distorted by fiber dispersion, fiber nonlinearity, and transient chirping of transmitters. Moreover, frequency response characteristics of receivers。