Nonlinear Distortion Analysis of Directly Modulated ... - 연세대학교

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injection locking technique, sidemode optical injection locking is proposed.The injection locking technique has a weakness for stability, which is relatedto the stable locking range. By injecting external light into a DFB lasersidemode, the laser distortion is suppressed significantly, and a wider stablelocking range is achieved compared to the previously reported main-modeoptical injection locking.___________________________________________________________Keywords: nonlinear distortion, direct laser modulation, optical injectionlocking, sidemode optical injection locking, analog fiber optic link,stable locking range, Volterra series, rate equationvi
I. IntroductionIn the past, telecommunication networks were generally classified intothree main categories: the public switched telephone network (PSTN), thelocal-area computer network, and the emerging community antenna television(CATV) network [1]. Such networks mainly provided voice communicationservices, multimedia oriented services, and broadcast entertainment videosignals. However, with increasing computer power and Internet relatedservices, they are merging into one broadband network services. Thecompanies want to serve voice, multimedia, and entertainment altogether.Moreover, new high technology telecommunication networks such as PCS,IMT-2000, and HDTV services are developed and these will prevail soon. Toserve these to customers cheap and efficiently, high-speed transmissionnetworks are needed, and optical communication networks are proper for them.Optical networks are usually used as a backbone network, and have severalhundreds Gbps data transmission capacity. To apply such high speed to thebroadband network services, analog fiber-optic transmission systems aresuggested as simple and low cost systems [2].In the analog fiber-optic transmission systems, multiple analog data signalsare transmitted by one or many optical carriers. Because the optical carrier hasvery large bandwidth and analog data capacity is from several Mbps to tens ofMbps, analog fiber-optic transmission systems can serve tens of channels at atime. Therefore, simple and low cost broadband network services are possible.The analog fiber-optic transmission systems have two kinds of datamodulation methods: direct modulation and external modulation. When1
Page 1 and 2: Nonlinear Distortion Analysis of Di
Page 3 and 4: ________________ ________________ _
Page 5 and 6: IndexFigure Index ⋅⋅⋅⋅⋅
Page 7 and 8: Figure 3.11 Simulation results of I
Page 9: AbstractNonlinear Distortion Analys
Page 13 and 14: solution for increasing the detunin
Page 15 and 16: [8, 9, 10]. This phenomenon occurs
Page 17 and 18: 0Optical Power (dBm)-10-20-30-40-50
Page 19 and 20: is the laser nonlinear transfer fun
Page 21 and 22: (3) Laser nonlinear transfer functi
Page 23: D11= τng2− 2( N00[(1 − 2εP)(
Page 26 and 27: f kn . The order of the IMP corresp
Page 28 and 29: 100-10Amplitude (dB)-20-30-40-50-60
Page 30 and 31: -20Amplitude (dB)-30-40-50-60-70thr
Page 32 and 33: locking to suppress nonlinear disto
Page 34 and 35: By using this system matrix, the sy
Page 36 and 37: Harmonic Power (dBm)0-10-20-7 dBc2
Page 38 and 39: these suppression values are depend
Page 40 and 41: oscillation [21]. This will result
Page 42 and 43: 20Detuning Frequency (GHz)0-20-40-6
Page 44 and 45: nonlinear phenomena simulation shou
Page 46 and 47: Normalize Frequency Response (dB)10
Page 48 and 49: effects.Finally, for verifying the
Page 50 and 51: IMD2 Suppression (dB)15141312111098
Page 52 and 53: -20-30-40-0-60-70-802.70 2.75 .80 2
Page 54 and 55: IV. Nonlinear Distortion Suppressio
Page 56 and 57: -10Optical Power (dBm)-20-30-40-50-
Page 58 and 59: Normalized Main Mode Power (dB)0-10
Page 60 and 61:
frequency.Then, reduction of IMD3 i
Page 62 and 63:
-10-20Detected RF power (dBm)-30-40
Page 64 and 65:
-20RF Power (dBm)-30-40-50-60-70-80
Page 66 and 67:
V. SummaryIn analog fiber-optic lin
Page 68 and 69:
VI. References[1] W, I, Way, “Bro
Page 70 and 71:
quantum-well lasers,” J. Quantum
Page 72:
.__________________________________
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Nonlinear Distortion Analysis of Directly Modulated ... - 연세대학교

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