Dispersion-induced composite second-order distortion at 1.5 mu m

Bergmann, Ernest E.; Kuo, Chi-Tai; Huang, Shih-Jen

doi:10.1109/68.68048

Cited by 75 publications

(14 citation statements)

References 7 publications

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“…A more fundamental problem occurs with fiber dispersion which results in wavelength-dependent delay. The distortion due to chirp and dispersion has recently been analyzed [7], If intensity-modulated light from a DFB laser is transmitted through a dispersive medium, such as an optical fiber, then the laser frequency modulation is converted to a modulation of the transmission delay 7 through the link. The output signal waveform So(t) will be of the form PI.…”

Section: Impact Of Chirp Of Second-order Distortionmentioning

confidence: 99%

Optimum range for DFB laser chirp for fiber-optic AM video transmission

Blauvelt¹,

Kwong²,

Chen³

et al. 1993

J. Lightwave Technol.

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Simple expressions for the impact of the DFB laser chirp on the system noise and distortion specifications of AM CATV fiber links are derived. These expressions are found to agree well with measured results. There is a narrow range of chirp for which the degradation of both noise and distortion is low. 1310 nm lasers are found to have chirp within the acceptable range. 1550 nm lasers are found to have chirp that is unacceptably large for most CATV applications.

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Section: Impact Of Chirp Of Second-order Distortionmentioning

confidence: 99%

Optimum range for DFB laser chirp for fiber-optic AM video transmission

Blauvelt¹,

Kwong²,

Chen³

et al. 1993

J. Lightwave Technol.

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“…The 1.55 m EDFA's would be used in the transmitter sections even though the transmission line sections would retain the conventional 1.3 m zero-dispersion single-mode fibers already deployed. Under this high wavelength-dispersion condition, SCM transmission systems experience serious performance deterioration due to the dispersion-induced nonlinear distortion caused by the combined action of fiber dispersion and the frequency chirp of the optical transmitter [6], [7].…”

Section: Introductionmentioning

confidence: 99%

Reduction of dispersion-induced distortion in SCM transmission systems by using predistortion-linearized MQW-EA modulators

Iwai

Satô²,

Suto

1997

J. Lightwave Technol.

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The application of low-chirp MQW (multiquantum well)-EA (electro-absorption) modulators to subcarrier multiplexing (SCM) optical transmission systems is studied. The authors show that a third-order predistortion circuit is feasible for compensating the nonlinearity of this type of modulator. The degree of frequency chirping per optical intensity modulation depth of the modulator is theoretically determined to be about 1.4 MHz. A 42-channel AM-SCM signal transmitter with the predistortion circuit realizes both composite second-order distortion (CSO) and composite triple beat distortion (CTB) values under 057 dBc after 200-km-long transmission. The authors confirm dispersioninduced distortion of the MQW-EA modulator is as small as that of the LiNbO3 modulator. Carrier-to-noise ratios (CNR's) of 45.2 dB for channel 1 and 43.8 dB for channel 42 were measured after 100 km transmission. It is found that the deterioration of a CNR is caused by the cascaded erbium doped fiber amplifiers (EDFA's), Rayleigh backscattered power and the optical phase noise. Theoretical CNR's show that the output power of the modulator should be higher to improve CNR.

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“…For the externally modulated transmitter of system I with optical modulation index (OMI) of 3.5% , its SBS-suppression ability is about 1 16 dBm, so that the launched optical power into the ® ber should be kept at µ ‡16 dBm by using a variable optical attenuator (VOA) to avoid the induced degradation from the SBS eOE ect. Since a directly modulated laser diode and a two-wavelength operation was used in system II, the optical linewidth in a directly modulated DFB laser is su ciently large enough to eliminate the SBS degradation [5].…”

mentioning

confidence: 99%

Long-Distance Transmission of Directly Modulated 1550nm AM-VSB CATV Systems

Lu¹,

Lee²,

Kuo³

2001

Fiber and Integrated Optics

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This study presents a directly modulated 1550 nm NTSC AM-VSB 74-channel Wber optical CATV long-distance (over 100 km) transmission system. In this system, 1550 nm analog distributed feedback (DFB) laser diodes, push-pull preampliWer, half-split-band, wavelength-division-multiplexing (WDM), and in-line erbiumdoped Wber ampliWers (EDFAs) were used. Performances of carrier-to-noise ratio (CNR) of ¶ 49 dB, compositie second order (CSO) of ¶ 70 dB, and composite triple beat (CTB) of ¶ 65 dB were obtained over 100 km of standard single-mode Wber (SMF) transmission. This proposed directly modulated transmission system is simpler and more cost-eVective than conventionally externally modulated 1550 nm transmission systems.For long-distance AM video transmission in ® ber optical CATV systems, the maximum ® ber link length using cascaded in-line erbium-doped ® ber ampli® ers (EDFAs) is limited by AM-VSB video system RF parameters such as carrier-to-noise ratio (CNR), composite second-order (CSO), and composite triple beat (CTB) at the end of the ® ber link. These parameters are seriously degraded by stimulated Brillouin scattering (SBS) and ® ber chromatic dispersion eOE ect in 1550 nm AM-VSB ® ber optical CATV systems [1,2]. Several ways have been proposed to improve system performances such as using diOE erential detection at the receiver site [3] or using dispersion compensation ® ber (DCF) within the link [4]. However, for the former one, an additional set of an expensive externally modulated transmitter, a ® ber link, and an optical receiver are required, while poor CNR quality may be induced in the latter one due to high loss characteristics of the DCF. Moreover, it is di cult to obtain good CNR, CSO, and CTB performances for the full channel loading simultaneously. In this study, a directly modulated NTSC AM-VSB 74-channel system 279 Fiber and Integrated Optics, 20:279± 285, 2001

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Dispersion-induced composite second-order distortion at 1.5 mu m

Cited by 75 publications

References 7 publications

Optimum range for DFB laser chirp for fiber-optic AM video transmission

Optimum range for DFB laser chirp for fiber-optic AM video transmission

Reduction of dispersion-induced distortion in SCM transmission systems by using predistortion-linearized MQW-EA modulators

Long-Distance Transmission of Directly Modulated 1550nm AM-VSB CATV Systems

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