Theoretical and experimental investigation of conversion of phase noise to intensity noise by Rayleigh scattering in optical fibers

Wu, Sheng; Yariv, Amnon; Blauvelt, H.; Kwong, N.

doi:10.1063/1.105541

Cited by 30 publications

(12 citation statements)

References 2 publications

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“…The C / N of AM links is unavoidably degraded by double backscattering of light. This effect has recently been analyzed [9], [lo]. The mixing at the photodiode of light that is transmitted directly from the laser to the photodiode with light that has been twice reflected generates noise which extends over frequencies proportional to the chirped linewidth of the laser.…”

Section: Impact Of Chirp On Noise In Fiber-optic Linksmentioning

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 On Noise In Fiber-optic Linksmentioning

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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“…Equations (4)- (6) together with (12) can be used to determine , which is shown in the inset. The slight discrepancy between experiment and theory is attributed to the simple model used to describe the RIN, which does not include the effect of side modes [15] and FM-to-IM noise conversion due to double Rayleigh scattering [16]. These two effects are independent of the launched power and explain why does not equal exactly zero at small launched powers.…”

Section: Effect Of Sbs On Relative Intensity Noisementioning

confidence: 94%

“…There we show that, in the case of backward Brillouin scattering, the acoustic wave can be well described by a material density fluctuation that satisfies the wave equation driven through electrostriction by the electric field , that is, (15) where is the longitudinal sound velocity, is the damping factor, and quantifies the strength of the electrostrictive effect. This acoustic wave originates a nonlinear polarization given by (16) where is the material density. In the absence of electric field, only a discrete set of acoustic modes can propagate in the fiber.…”

Section: Explanation Of Sbs-induced Phase Changementioning

confidence: 99%

Degradation of modulation and noise characteristics of semiconductor lasers after propagation in optical fiber due to a phase shift induced by stimulated Brillouin scattering

Peral

Yariv

1999

IEEE J. Quantum Electron.

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Abstract-Here we demonstrate theoretically that stimulated Brillouin scattering (SBS) can induce a phase shift of the optical carrier relative to its sidebands due to the waveguiding effect of the optical fiber on the acoustic wave. This causes conversion of frequency modulation to intensity modulation, which results in an increase in the relative intensity noise and degradation of the modulation response of directly modulated lasers after propagation in an optical fiber, in agreement with our experimental observations. Suppression of SBS can be achieved at low frequencies and high modulation powers due to the laser adiabatic chirp.Index Terms-Brillouin scattering, laser noise, optical fiber communication, optical fiber measurement, optical modulation, optical propagation in nonlinear media, semiconductor lasers.

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“…For optoelectronic repeaters, the distortion from two lasers must be cascaded. In the worst case, when the distortion characteristics of the light that is backscattered twice [8], [9]. We have neglected this contribution for externally modulated links although there is a small noise contribution close to each carrier due to this mechanism.…”

Section: A Optoelectronic Repeaters As An Alternative To Optical Ampmentioning

confidence: 98%

High-power 1310 nm DFB lasers for AM video transmission

Blauvelt

Chen

Bar‐Chaim

et al. 1992

J. Lightwave Technol.

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Abstruct-Increasing the output power of linear DFB lasers is an effective method for increasing the optical loss budget of AM fiber optic links. For systems using 1310-nm zero dispersion fiber, 1310-nm lasers are preferred to avoid distortion resulting from the combination of dispersion and laser chirp. Increased optical budgets can be used to increase span lengths or to use optical splitting. In this paper, results are presented for an 18" linear laser. Using 62 channel loading, a C/N of 59.5 dB was achieved for a 20-km link with 9-dB optical loss. For 20-dB optical loss, a C/N of 50.5 dB was achieved. The current status of high power lasers and the fundamental and practical limits for further increases in power are discussed. Optoelectronic repeaters using high power lasers are shown to be an effective alternative to optical amplifiers for broadcast AM video distribution.

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Theoretical and experimental investigation of conversion of phase noise to intensity noise by Rayleigh scattering in optical fibers

Cited by 30 publications

References 2 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

Degradation of modulation and noise characteristics of semiconductor lasers after propagation in optical fiber due to a phase shift induced by stimulated Brillouin scattering

High-power 1310 nm DFB lasers for AM video transmission

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