Compensation for waveform distortion in a transmission fiber with loss by optical phase conjugation

Watanabe, Shigeki; Shirasaki, M.; Chikama, T.

doi:10.1002/ecjb.4420790510

Cited by 1 publication

(2 citation statements)

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“…In optical fiber communication systems using OPC, the signal light is converted to phase-conjugated light at the midpoint of the transmission line so that pulse distortions caused by dispersion and nonlinear effects received in the first half of the transmission line are compensated in the second half [6]. In general, phase-conjugated light can be generated by a nonlinear process such as FWM and optical parametric amplification.…”

Section: Broadband Phase Conjugatormentioning

confidence: 99%

“…Various systems for waveform distortion compensation due to wavelength dispersion of the fiber have been studied, including dispersion management [1,2] and nonlinear transmission technologies [3,4]. One such technique is the transmission system with an optical phase conjugator (OPC) at the midpoint of the transmission line invented in 1979 by Yariv [5][6][7]. In this transmission system using an OPC, the signal light is transformed to its phase conjugate light at the midpoint of the transmission line so that the dispersion and the distortion by the nonlinearity received in the first half of the transmission line are compensated in the second half of the line.…”

Section: Introductionmentioning

confidence: 99%

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Consideration based on simulation for a DWDM system composed of a wide‐band optical phase conjugator and dispersion‐flattened transmission line

Yao

Hanawa

Takahara

et al. 2003

Electron. Comm. Jpn. Pt. I

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SUMMARYIn wavelength division multiplexing transmission, nonlinear effects such as cross phase modulation between the pulses of channels with different wavelengths due to overtaking causes pulse distortion and timing jitter. In particular, deterioration of the transmission characteristics caused by cross phase modulation becomes more conspicuous when the incident peak power becomes larger. In order to realize a wavelength division multiplexing transmission system with a higher bit rate over a longer distance, a high incident peak power that maintains a high SNR is indispensable and a technique to compensate the effect of cross phase modulation is needed. In this paper, computer simulation demonstrates that, by placing a broadband phase conjugator at the center of the dispersion-flattened transmission line, the cross phase modulations caused in the first half and the latter half are canceled and its effect can be reduced. It is further shown that the transmission system with the present configuration can increase the incident peak power by 5 dB over that using nonlinear transmission, which is considered effective for high densities in the case of wavelength division multiplexing transmission with a frequency use efficiency of 0.32 bit/s/Hz.

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Section: Broadband Phase Conjugatormentioning

confidence: 99%