Nonlinear Distortion Analysis of Directly Modulated ... - 연세대학교

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considering cost aspect, the direct modulation is preferred. The directmodulation is that the information signals are supplied to the semiconductorlasers directly, and the laser output is data modulated light. With directmodulation method, the semiconductor lasers can transmit information signalsmultiplexed by RF-range (> 1 GHz) subcarriers. However, whensemiconductor lasers are modulated with RF-range electrical signals, nonlineardistortions occur. Such distortions can cause severe system performancedegradation, because they cause inter-channel interference that limits thenumber of channels as well as transmission distance [3, 4].In low frequency (
solution for increasing the detuning range, sidemode injection lockingtechnique is proposed. In this scheme, light is injected into a highly suppressedDFB (Distributed Feedback) laser Fabry-Perot mode instead of the DFB lasermain-mode. In sidemode optical injection locking, as the sidemode lasingpower is very low, the unstable locking characteristics due to mode beatingbetween the ML and SL do not easily occur, and the stable locking range canbe extended.In this thesis, the distortion characteristics and locking characteristics ofinjection locked DFB lasers are analyzed and the effects of the sidemodeinjection locking characteristics in locking range and distortion suppressionare investigated. First, Section II deals with nonlinear distortion characteristicsof directly modulated DFB lasers with Volterra series expansion and numericalanalysis of the laser rate equation model. In Section III, the parameterdependent injection locking bandwidth and the laser nonlinear distortionsuppression according to the injection power and wavelengths are investigated.Finally, Section IV deals with the sidemode injection locking characteristicsand demonstrate that, by using sidemode injection locking, the nonlineardistortions are suppressed greatly and the stable locking range is extended by afactor of two compared to the main-mode injection locking experimentally.3
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 and 10: AbstractNonlinear Distortion Analys
Page 11: I. IntroductionIn the past, telecom
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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