| 1. |
- Alic, N., et al.
(författare)
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Benefits of Joint Statistics in MLSD-Equalized Transmission
- 2009
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Ingår i: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 21:8, s. 495-497
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Tidskriftsartikel (refereegranskat)abstract
- We experimentally investigate and quantify performance improvement, accounting for multiple bit intervals' joint statistics in filtered equalized on-off keying OC-192 fiber-optic links relying on Viterbi-algorithm-based sequence detection. We demonstrate that the penalty associated with narrow filtering can be alleviated for the most part with an appropriate detection approach.
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| 2. |
- Alic, N., et al.
(författare)
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Joint Statistics and MLSD in Filtered Incoherent High-Speed Fiber-Optic Communications
- 2010
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 28:10, s. 1564-1572
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, signal statistics and their utilization for detection in narrowly filtered equalized high-speed fiber-optic communications are investigated experimentally. Tradeoffs between log-likelihood metric applications and oversampling are covered in detail. It is, for the first time, demonstrated that performance loss in bandwidth-limited systems can be nearly fully recovered (to within 0.5 dB) by taking advantage of band-width-limitation-induced noise correlations and oversampling.
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| 3. |
- Andrekson, Peter, 1960
(författare)
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All-optical waveform sampling
- 2009
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Ingår i: Optics InfoBase Conference Papers. - 2162-2701. - 9781424440801
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Konferensbidrag (refereegranskat)
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| 4. |
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| 5. |
- Andrekson, Peter, 1960
(författare)
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Amplification technologies for capacity and reach enhancements
- 2014
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Ingår i: Optics InfoBase Conference Papers. - 2162-2701. ; , s. Art. no. 6886674-
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Konferensbidrag (refereegranskat)abstract
- A review of optical amplifier technologies will be given with the purpose to illustrate possible ways forward to delay the “capacity crunch”. This includes Raman and parametric amplifiers as well as multi-core/few-mode amplifiers.
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| 6. |
- Andrekson, Peter, 1960
(författare)
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Applications of nonlinear four-wave mixing in optical communication
- 2023
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Ingår i: Optik. - : Elsevier BV. - 0030-4026. ; 279
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Tidskriftsartikel (refereegranskat)abstract
- In this paper I will briefly review some applications of nonlinear four-wave-mixing in optical fibers and silicon-nitride waveguides. This includes ultrafast all-optical waveform sampling and ‘noiseless’ phase-sensitive optical amplification which have been demonstrated to enable signal recovery at very low optical powers.
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| 7. |
- Andrekson, Peter, 1960
(författare)
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Applications of phase-sensitive parametric amplification
- 2012
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Ingår i: Optics InfoBase Conference Papers. - Washington, D.C. : OSA. - 2162-2701.
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Konferensbidrag (refereegranskat)abstract
- A review of recent progress in nonlinear fiber-based phase-sensitive parametric amplifiers is provided. In addition, their potential use as in-line amplifiers, resulting in significant link performance improvement potential, is discussed.
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| 8. |
- Andrekson, Peter, 1960, et al.
(författare)
-
Fiber-based phase-sensitive optical amplifiers and their applications
- 2020
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Ingår i: Advances in Optics and Photonics. - 1943-8206. ; 12:2, s. 367-428
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Tidskriftsartikel (refereegranskat)abstract
- Optical parametric amplifiers rely on second-order susceptibility (three-wave mixing) or third-order susceptibility (four-wave mixing) in a nonlinear process where the energy of incoming photons is not changed (elastic scattering). In the latter case, two pump photons are converted to a signal and to an idler photon. Under certain conditions, related to the phase evolution of the waves involved, this conversion can be very effi-cient, resulting in large amplification of an input signal. As the nonlinear process can be very fast, all-optical applications aside from pure amplification are also possible. If the amplifier is implemented in an optical input-phase-sensitive manner, it is possible to amplify a signal wave without excess noise, i.e., with a noise figure of 0 dB. In this paper, we will provide the fundamental concepts and theory of such amplifiers, with a focus on their implementation in highly nonlinear optical fibers relying on four-wave mixing. We will discuss the distinctions between phase-insensitive and phase-sensitive operation and include several experimental results to illustrate their capability. Different applications of parametric amplifiers are also discussed, including their use in optical communication links.
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| 9. |
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| 10. |
- Andrekson, Peter, 1960
(författare)
-
Free-space optical communication with ultralow noise optical amplifiers
- 2023
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Ingår i: 2023 IEEE International Conference on Space Optical Systems and Applications, ICSOS 2023. ; , s. 115-117
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Konferensbidrag (refereegranskat)abstract
- We will describe the potential use of phase-sensitive optical parametric amplifiers, capable of generating no excess noise, in free-space optical transmission systems with large losses, such as in deep-space links. We will highlight that at low signal-To-noise ratio, such amplifiers can achieve the best receiver sensitivity, spectral efficiency as well as power efficiency. We will also discuss their different implementations using either highly nonlinear optical fibers or compact siliconnitride waveguides.
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