Linewidth requirement evaluation and 290 km transmission experiment for optical CPFSK differential detection

Iwashita, K.; Matsumoto, Takuji; Tanaka, C.; Motosugi, George

doi:10.1049/el:19860542

Cited by 28 publications

(2 citation statements)

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“…However, for large IF linewidth AvIF, both greater frequency deviation and wider IF bandwidths will be required to obtain optimum performance [24]. Optical FSK heterodyne experiments using frequency discrimination demodulation have been reported at 140 [29], 250 [22], and 400 Mbit / s. [21], and by the authors at 1 Gbit / s [SI.…”

Section: Demodulation Of Optical Fsk Signals the Type Of Intermediatementioning

confidence: 99%

FSK heterodyne transmission experiments at 560 Mbit/s and 1 Gbit/s

Vodhanel

Gimlett

Cheung³

et al. 1987

J. Lightwave Technol.

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Optical frequency-shift-keying (FSK) signals are obtained from directly modulated distributed feedback (DFB) semiconductor lasers. Experimental studies of the direct frequency modulation (FM) characteristics of the DFB lasers show a nonuniform FM response due to the competing effects of thermal modulation of the laser active region and carrier density modulation. Equalization of the signal current to the laser is employed to produce a flat FM response from 30 kHz to 1 GHz. Optical FSK transmission and heterodyne detection experiments at 560-Mbit/s and 1-Gbit/s are conducted at a wavelength of 1497 nm. Receiver sensitivities of -39 dBm at 560 Mbit/s and -37 dBm at 1 Gbit/s are obtained. Transmission through 100 km of singlemode fiber at 1 Gbit/s is achieved with no degradation in receiver sensitivity.

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Section: Demodulation Of Optical Fsk Signals the Type Of Intermediatementioning

confidence: 99%

FSK heterodyne transmission experiments at 560 Mbit/s and 1 Gbit/s

Vodhanel

Gimlett

Cheung³

et al. 1987

J. Lightwave Technol.

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“…In practice, however, the best op tical detection sensitivities reported for coherent systems are as much as 10 times better than the best direct detec tion sensitivities [4] - [6], In this paper we use a semi-clas sical model of photodetection [3], [7] to evaluate detec tion sensitivity in the presence of some common receiver degradations. In order to gain an intuitive understanding of the evolution of receiver sensitivity from the direct de tection case, with no local oscillator (LO), to the case of shot noise limited coherent detection, we do not make the usual approximation of large LO.…”

Section: Introductionmentioning

confidence: 99%

A comparison of sensitivity degradations for optical homodyne versus direct detection of on-off keyed signals

Timor

Linke

1988

J. Lightwave Technol.

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The sensitivity of an optical homodyne receiver with prac tical degradations is analytically evaluated using a semiclassical pho todetection model which is valid for arbitrarily low levels of local us cillator (LO) power. This model provides several important advantages over the usual treatment in which large LO is assumed. In addition to giving an intuitive picture of the evolution of the detection sensitivity from the direct detection case (LO = 0) to the shot noise limited co herent detection case (large LO), it allows for a quantitative compar ison between degradations caused by some important receiver non idealities for the two limiting cases. Sensitivity loss due to dark cur rent, thermal noise, and electronic distortion is evaluated and the LO power required to reach shot nuise limited operation in the presence of these degradations is determined.

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