Reduction of Raman MPI and noise figure in dispersion-managed fibre

Vasilyev, Michael; Szalabofka, B.; Tsuda, S.; Grochocinski, J.M.; Evans, A.F.

doi:10.1049/el:20020194

Cited by 20 publications

(8 citation statements)

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“…The loss of the segmented transmission span was 18 dB. It is clear that this implementation of DRA is not practical to use in real systems but we would like to point out that there are more practical DRA schemes that achieve similar levels of power map flatness without using remote optical pumping or placing active optical components inside each transmission span [18][19][20][21].…”

Section: Methodsmentioning

confidence: 99%

Phase-sensitive amplifier link with distributed Raman amplification

Eliasson¹,

Vijayan²,

Foo³

et al. 2018

Opt. Express

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We demonstrate long-haul transmission using a hybrid amplifier approach combining distributed Raman amplification and lumped phase-sensitive amplification. Aside from the well-known resulting SNR improvement, distributed Raman amplification is included in an effort to improve the nonlinearity mitigation capability of the phase-sensitive amplifiers. When changing from phase-insensitive operation to phase-sensitive operation in a link employing distributed Raman amplification, the transmission reach at BER = 10 is increased from 15 to 44 spans of length 81 km while simultaneously increasing the optimal launch power by 2 dB.

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Section: Methodsmentioning

confidence: 99%

Phase-sensitive amplifier link with distributed Raman amplification

Eliasson¹,

Vijayan²,

Foo³

et al. 2018

Opt. Express

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“…In particular, a mirror-symmetric signal power profile is possible only when some transmission fibers are made distributively amplifying by means of distributed Raman pumping [18] or using distributed Er-doped fiber amplifiers (EDFAs) [19], so to obtain a constant net gain in correspondence to the loss coefficient of other fibers, or all fibers are rendered lossless. Recent experiments [20,21,22] have indeed demonstrated near constant-power or low power-excursion optical transmissions. However, there are still concerns of cost, reliability, and double-Rayleigh-scattering noise with distributive Raman amplification [18].…”

Section: Introductionmentioning

confidence: 97%

Simultaneous nonlinearity suppression and wide-band dispersion compensation using optical phase conjugation

Wei¹,

Plant²

2004

Opt. Express

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Optical phase conjugation is demonstrated to enable simultaneous wide-band compensation of the residual dispersion and the fiber nonlinearities in dispersion-managed fiber transmission lines employing slope-compensating fibers. When the dispersion slope of transmission fibers is equalized by slope-compensating fibers, the residual dispersion and the slope of dispersion slope are compensated by middle-span optical phase conjugation. More importantly, fiber nonlinearity may be largely suppressed by arranging the fibers into conjugate pairs about the phase conjugator, where the two fibers of each pair are in scaled translational symmetry. The translational symmetry is responsible for cancelling optical nonlinearities of the two fibers up to the first-order perturbation, then a mirror-symmetric ordering of the fiber pairs about the conjugator linearizes a long transmission line effectively.

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“…In-depth analysis of NF of these devices indicates their potential for beating the 3-dB NF quantum limit [15][16][17]. Recently, a FWM-based phasesensitive gain has been experimentally demonstrated using pump modulation sidebands as the signal and idler [18].In the talk, we will discuss the progress in FWM-based PSAs, and their extension to distributed amplification, where they can improve the NF beyond the limit of an ideal distributed amplifier reached recently in [19][20][21]. …”

mentioning

confidence: 99%

“…In the talk, we will discuss the progress in FWM-based PSAs, and their extension to distributed amplification, where they can improve the NF beyond the limit of an ideal distributed amplifier reached recently in [19][20][21].…”

mentioning

confidence: 99%

Phase-Sensitive Amplification in Optical Fibers

Vasilyev

2005

Frontiers in Optics

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We describe the progress in fiber-based phase-sensitive parametric amplifiers in both frequency-degenerate and frequency-nondegenerate configurations. We discuss their applications for phase regeneration, as well as for lumped and distributed noiseless amplification. 2005 Optical Society of America OCIS codes: (060.2320) Fiber optics amplifiers and oscillators; (190.4410) Nonlinear optics, parametric processes Phase-sensitive amplifiers (PSAs) have unique properties that allow them to break the 3-dB quantum limit of the optical amplifier noise figure [1], as well as provide the phase regeneration leading to suppression of frequency and timing jitters in optical transmission lines [2,3]. The first experimental demonstrations of sub-3-dB noise-figure (NF) PSAs were done in (2) -based devices [4,5]. The free-space bulk-crystal PSA also enabled noiseless amplification of images [6]. PSA's use in optical communication context, however, requires fiber-based approaches. One of such designs, based on a nonlinear optical loop mirror (NOLM), was introduced in [7] and successfully utilized in [8] for soliton regeneration in a long-term storage buffer. The solutions to synchronization of the pump and incoming signal phases were developed via pump injection locking [9] and optical phase-locked loop [10].Achieving the sub-3-dB NF in fiber-based PSAs, however, is challenged by the Guided Acoustic-Wave Brillouin Scattering (GAWBS) that introduces uncorrelated phase fluctuations in the counter-propagating NOLM arms, resulting in amplitude noise at the PSA output. The nearly noiseless PSA performance has nevertheless been experimentally demonstrated in [11,12], using pulses with orthogonal polarizations to cancel common GAWBS noise, followed by [13], where the GAWBS was avoided by conducting the NF measurements well above this noise's cut-off of ~2 GHz. Despite these successes, the complexity of GAWBS mitigation clearly limits the potential use of the NOLM-based PSAs. Even more importantly, the NOLM-based PSAs are inherently single-channel devices not compatible with modern wavelength-division-multiplexed (WDM) transmission systems.The above two drawbacks can be overcome in the new-generation fiber PSAs that are based on non-degenerate four-wave mixing (FWM) in fiber. By exciting a combination of the signal and idler waves at the input, such an optical parametric amplifier can be put into a phase-sensitive regime. Moreover, two independent modes involving signal-idler-wave combinations can be phase-sensitively amplified at the same time, resulting in the same bandwidth utilization as that of the frequency-degenerate PSA. Since all involved waves propagate in the same direction, the GAWBS perturbs all of them equally, with no impact on the PSA gain and noise. In addition, by using the widebandwidth parametric amplifiers (e.g. those involving two pumps [14]), one can simultaneously amplify many WDM channels, provided that their phases are synchronized up to a multiple of . In-depth analysis of NF of these devices indicates their po...

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Reduction of Raman MPI and noise figure in dispersion-managed fibre

Cited by 20 publications

References 1 publication

Phase-sensitive amplifier link with distributed Raman amplification

Phase-sensitive amplifier link with distributed Raman amplification

Simultaneous nonlinearity suppression and wide-band dispersion compensation using optical phase conjugation

Phase-Sensitive Amplification in Optical Fibers

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