| 1. |
- Corcoran, William, 1983, et al.
(author)
-
Noise beating in hybrid phase-sensitive amplifier systems
- 2014
-
In: Optics Express. - : The Optical Society. - 1094-4087 .- 1094-4087. ; 22:5, s. 5762-5771
-
Journal article (peer-reviewed)abstract
- We investigate the effect of noise loading in a hybrid phase-sensitive amplifier system, analyzing the effect of noise beating between the signal and idler waves coupled in a parametric amplifier. Through analyzing input and output optical signal to noise ratios, we find that system performance of a phase-sensitive amplifier is 3 to 6 dB improved over a phase-insensitive amplifier, depending on the ratio of loaded noise power to that of vacuum fluctuations. (C) 2014 Optical Society of America
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| 2. |
- Lorences Riesgo, Abel, 1987, et al.
(author)
-
Quadrature demultiplexing using a degenerate vector parametric amplifier
- 2014
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In: Optics Express. - 1094-4087 .- 1094-4087. ; 22:24, s. 29424-29434
-
Journal article (peer-reviewed)abstract
- We report on quadrature demultiplexing of a quadrature phase-shift keying (QPSK) signal into two cross-polarized binary phase-shift keying (BPSK) signals with negligible penalty at bit-error rate (BER) equal to 10−9. The all-optical quadrature demultiplexing is achieved using a degenerate vector parametric amplifier operating in phase-insensitive mode. We also propose and demonstrate the use of a novel and simple phase-locked loop (PLL) scheme based on detecting the envelope of one of the signals after demultiplexing in order to achieve stable quadrature decomposition.
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| 3. |
- Lundström, Carl Peter, 1982, et al.
(author)
-
Fiber optic parametric amplifier with 10-dB net gain without pump dithering
- 2013
-
In: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 25:3, s. 234-237
-
Journal article (peer-reviewed)abstract
- We present a stimulated Brillouin Scattering (SBS)-suppressed fiber optic parametric amplifier/wavelength converter constructed from four highly nonlinear fiber pieces with applied strain gradients and separated by isolators. The effective total SBS threshold increase is about 11 dB, and a net parametric gain of 10 dB is obtained without any pump dithering.
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| 4. |
- Lundström, Carl Peter, 1982, et al.
(author)
-
Fiber-optic parametric amplifiers without pump dithering
- 2013
-
In: Optics InfoBase Conference Papers. - Washington, D.C. : OSA. - 2162-2701.
-
Conference paper (peer-reviewed)abstract
- We present passively stimulated Brillouin scattering-suppressed highly nonlinear fiber cascades, and use them to implement fiber-optic parametric amplifiers capable of up to 10 dB net parametric gain without pump dithering.
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| 5. |
- Malik, Rohit, 1984, et al.
(author)
-
Optical signal to noise ratio improvement through unbalanced noise beating in phase-sensitive parametric amplifiers
- 2014
-
In: Optics Express. - : The Optical Society. - 1094-4087 .- 1094-4087. ; 22:9, s. 10477-10486
-
Journal article (peer-reviewed)abstract
- We investigate the beating of signal and idler waves, which have imbalanced signal to noise ratios, in a phase-sensitive parametric amplifier. Imbalanced signal to noise ratios are achieved in two ways; first by imbalanced noise loading; second by varying idler to signal input power ratio. In the case of imbalanced noise loading the phase-sensitive amplifier improved the signal to noise ratio from 3 to 6 dB, and in the case of varying idler to signal input power ratio, the signal to noise ratio improved from 3 to in excess of 20 dB.
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| 6. |
- Malik, Rohit, 1984, et al.
(author)
-
Record-high sensitivity receiver using phase sensitive fiber optical parametric amplification
- 2014
-
In: Technical Digest Series: Optical Fiber Communication Conference, OFC 2014; San Francisco, CA; United States; 9 March 2014 through 13 March 2014. - 2162-2701. - 9781557529930 ; , s. Art. no. 6886736-
-
Conference paper (peer-reviewed)abstract
- We demonstrate record sensitivity (55 photons/bit) for on-off keying modulation at 10 Gb/s using a phase sensitive amplifier as preamplifier. Experimental results depicting the effects of pump phase modulation on the sensitivity are reported.
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| 7. |
- Astra, E., et al.
(author)
-
Dispersion management for nonlinearity mitigation in two-span 28 GBaud QPSK phase-sensitive amplifier links
- 2017
-
In: Optics Express. - 1094-4087 .- 1094-4087. ; 25:12, s. 13163-13173
-
Journal article (peer-reviewed)abstract
- We present an investigation of dispersion map optimization for-span single channel 28 GBaud QPSK transmission systems with phase-sensitive amplifiers (PSAs). In experiments, when the PSA link is operated in a highly nonlinear regime, a 1.4 dB error vector magnitude (EVM) improvement is achieved compared to a one-span optimized dispersion map link due to improved nonlinearity mitigation. The two-span optimized dispersion map of a link differs from the optimized dispersion map of a dispersion managed phase-insensitive amplifier (PIA) link, Simulations show that the performance of the two-span dispersion map optimized PSA link does not improve by residual dispersion optimization. Further, by using the two-span optimized dispersion maps repeatedly in a long-haul PSA link instead of one-span optimized maps, the maximum transmission reach can he improved 1,5 times, (C) 2017 Optical Society of America
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| 8. |
- Astra, E., et al.
(author)
-
Dispersion map optimization for nonlinearity mitigation in two-span phase-sensitive amplifier links
- 2016
-
In: 42nd European Conference on Optical Communication, ECOC 2016; Dusseldorf; Germany; 18 September 2016 through 22 September 2016. - 9783800742745 ; , s. 953-955
-
Conference paper (peer-reviewed)abstract
- The first investigation of dispersion map optimization in two-span PSA-amplified links is presented. We show numerically and experimentally, that the nonlinearity mitigation improves by 1.4 dB if different dispersion maps are applied in each span, compared to single-span optimized maps.
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| 9. |
- Corcoran, William, 1983, et al.
(author)
-
Mitigation of Nonlinear Impairments on QPSK Data in Phase-Sensitive Amplified Links
- 2013
-
In: 39th European Conference on Optical Communication and Exhibition, ECOC 2013, London, 22-26 September 2013. - : Institution of Engineering and Technology. - 9781849197595 ; 2013:622 CP, s. 486-488
-
Conference paper (peer-reviewed)abstract
- We investigate the mitigation of nonlinear impairments via phase-sensitive amplification. We show in simulation and experiment that this effect can be optimized through engineering link dispersion. A phase-sensitive amplified link is measured to reduce nonlinear penalties by over 3dB compared to a phase-insensitive amplified link.
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| 10. |
- Corcoran, William, 1983, et al.
(author)
-
Phase-Sensitive Optical Pre-Amplifier Implemented in an 80km DQPSK Link
- 2012
-
In: Optics InfoBase Conference Papers. - Washington, D.C. : OSA. - 2162-2701.
-
Conference paper (peer-reviewed)abstract
- We present the first demonstration of a phase-sensitive fiber optic parametric amplifier successfully implemented over an 80 km dispersion managed link. We measure 1.3 dB higher sensitivity with this amplifier system against a comparable conventional EDFA-based link.
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| 11. |
- Eliasson, Henrik, 1985, et al.
(author)
-
Comparison between Coherent Superposition in DSP and PSA for Mitigation of Nonlinearities in a Single-span Link
- 2014
-
In: European Conference on Optical Communication, ECOC 2014; Cannes; France; 21 September 2014 through 25 September 2014. - 9782954944401 ; , s. Art. no. 6964015-
-
Conference paper (peer-reviewed)abstract
- An experimental comparison is made between nonlinearity mitigation through coherent superposition optically in a phase-sensitive amplifier and electrically in DSP. The improved nonlinear tolerance is quantified in terms of EVM with high received power and sensitivity with high launch power.
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| 12. |
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| 13. |
- Eliasson, Henrik, 1985, et al.
(author)
-
Mitigation of nonlinear distortion in hybrid Raman/phase-sensitive amplifier links
- 2016
-
In: Optics Express. - 1094-4087 .- 1094-4087. ; 24:2, s. 888-900
-
Journal article (peer-reviewed)abstract
- Hybrid systems combining distributed Raman amplification and phase-sensitive amplifiers (PSAs) are investigated in numerical simulations. We focus on the mitigation of fiber nonlinearities and the impact of the span power map which is also important in systems employing optical phase conjugation or phase-conjugated twin waves.We simulate multi-span PSA links with and without distributed Raman amplification and show that by including distributed Raman amplification, the transmission distance increases more at optimum launch power than in the linear regime. For a 5-channel WDM QPSK PSA-amplified system, we observe a transmission reach increase by a factor of 8.1 by including ideal distributed Raman amplification.
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| 14. |
- Eliasson, Henrik, 1985, et al.
(author)
-
Phase-sensitive amplifier link with distributed Raman amplification
- 2018
-
In: Optics Express. - 1094-4087 .- 1094-4087. ; 26:16, s. 19854-19863
-
Journal article (peer-reviewed)abstract
- 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 = 10−3is increased from 15 to 44 spans of length 81 km while simultaneously increasing the optimal launch power by 2 dB.
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| 15. |
- Gruner-Nielsen, Lars, et al.
(author)
-
Brillouin Suppressed Highly Nonlinear Fibers
- 2012
-
In: European Conference and Exhibition on Optical Communication, ECEOC 2012; Amsterdam; Netherlands; 16 September 2012 through 20 September 2012. - 9781557529503 ; , s. We.1.F.1-
-
Conference paper (peer-reviewed)abstract
- Methods for suppression of stimulated Brillouin scattering in highly nonlinear fibers are reviewed. Emphasis is paid to SBS suppression by aluminum doping of the core. New results for a HNLF with an aluminum doped core and reduced loss are presented.
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| 16. |
- Lundström, Carl Peter, 1982, et al.
(author)
-
Phase-Sensitive Amplifiers for Optical Links
- 2013
-
In: Optical Fiber Communications Conference (OFC). - 9781479904570 ; , s. OW3C.5-
-
Conference paper (peer-reviewed)abstract
- A review of recent progress on the implementation of phase-sensitive amplifiers in optical links is provided. Additionally, their use as regenerators, specifically the trade-off between phase- and amplitude regeneration is discussed.
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| 17. |
- Lundström, Carl Peter, 1982, et al.
(author)
-
Short-Pulse Amplification in a Phase-Sensitive Amplifier
- 2012
-
In: Optics InfoBase Conference Papers. - Washington, D.C. : OSA. - 2162-2701. - 9781557529381
-
Conference paper (peer-reviewed)abstract
- We experimentally demonstrate amplification of picosecond pulses in a PSA, discuss the tolerance on residual delay and dispersion on the signal and idler, and also show the first demonstration of pulse compression in a PSA.
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| 18. |
- Olsson, Samuel L I, 1984, et al.
(author)
-
Injection locking-based pump recovery for phase-sensitive amplified links
- 2013
-
In: Optics Express. - : The Optical Society. - 1094-4087 .- 1094-4087. ; 21:12, s. 14512-14529
-
Journal article (peer-reviewed)abstract
- An injection locking-based pump recovery system for phase-sensitive amplified links, capable of handling 40 dB effective span loss, is demonstrated. Measurements with 10 GBd DQPSK signals show penalty-free recovery of a pump wave, phase modulated with two sinusoidal RF-tones at 0.1 GHz and 0.3 GHz, with 64 dB amplification. The operating power limit for the pump recovery system is experimentally investigated and is governed by the noise transfer and phase modulation transfer characteristics of the injection-locked laser. The corresponding link penalties are explained and quantified. This system enables, for the first time, WDM compatible phase-sensitive amplified links over significant lengths.
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| 19. |
- Olsson, Samuel L I, 1984, et al.
(author)
-
Linear and nonlinear transmission of 16-QAM over 105 km phase-sensitive amplified link
- 2014
-
In: Technical Digest Series: Optical Fiber Communication Conference, OFC 2014; San Francisco, CA; United States; 9 March 2014 through 13 March 2014. - Washington, D.C. : OSA. - 2162-2701. - 9781557529930
-
Conference paper (peer-reviewed)abstract
- We demonstrate 16-QAM transmission over a 105 km phase-sensitive amplified link showing significantly improved performance in both the linear and nonlinear propagation regime. Constellation and BER measurements are performed.
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| 20. |
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| 21. |
- Olsson, Samuel L I, 1984, et al.
(author)
-
Long-haul optical transmission link using low-noise phase-sensitive amplifiers
- 2018
-
In: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723 .- 2041-1723. ; 9:1
-
Journal article (peer-reviewed)abstract
- The capacity and reach of long-haul fiber optical communication systems is limited by in-line amplifier noise and fiber nonlinearities. Phase-sensitive amplifiers add 6 dB less noise than conventional phase-insensitive amplifiers, such as erbium-doped fiber amplifiers, and they can provide nonlinearity mitigation after each span. Realizing a long-haul transmission link with in-line phase-sensitive amplifiers providing simultaneous low-noise amplification and nonlinearity mitigation is challenging and to date no such transmission link has been demonstrated. Here, we demonstrate a multi-channel-compatible and modulation-format-independent long-haul transmission link with in-line phase-sensitive amplifiers. Compared to a link amplified by conventional erbium-doped fiber amplifiers, we demonstrate a reach improvement of 5.6 times at optimal launch powers with the phase-sensitively amplified link operating at a total accumulated nonlinear phase shift of 6.2 rad. The phase-sensitively amplified link transmits two data-carrying waves, thus occupying twice the bandwidth and propagating twice the total power compared to the phase-insensitively amplified link.
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| 22. |
- Olsson, Samuel L I, 1984, et al.
(author)
-
Long-Haul Optical Transmission of 16-QAM Signal with In-Line Phase-Sensitive Amplifiers
- 2017
-
In: European Conference on Optical Communication, ECOC. ; 2017-September, s. 1-3
-
Conference paper (peer-reviewed)abstract
- We demonstrate transmission of a 10 GBd 16-QAM signal with low-noise in-line phase-sensitive amplifiers in a recirculating loop experiment. A fourfold reach improvement is obtained at optimal launch powers using phase-sensitive amplification compared to phase-insensitive amplification.
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| 23. |
- Olsson, Samuel L I, 1984, et al.
(author)
-
Long-Haul Optical Transmission Using In-Line Phase-Sensitive Amplifiers
- 2015
-
In: Asia Communications and Photonics Conference, ACPC 2015, Hong Kong, 19-23 November. - Washington, D.C. : OSA. - 9781943580064
-
Conference paper (peer-reviewed)abstract
- We review recent advances in periodically amplified transmission using in-line phase-sensitive amplifiers (PSAs). Recent results are discussed showing the benefits of two-mode PSAs in periodically amplified transmission links provided by low-noise amplification and nonlinearity mitigation.
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| 24. |
- Olsson, Samuel L I, 1984, et al.
(author)
-
Nonlinear phase noise mitigation in phase-sensitive amplified transmission systems
- 2015
-
In: Optics Express. - 1094-4087 .- 1094-4087. ; 23:9, s. 11724-11740
-
Journal article (peer-reviewed)abstract
- We investigate the impact of in-line amplifier noise in transmission systems amplified by two-mode phase-sensitive amplifiers (PSAs) and present the first experimental demonstration of nonlinear phase noise (NLPN) mitigation in a modulation format independent PSA-amplified transmission system. The NLPN mitigation capability is attributed to the correlated noise on the signal and idler waves at the input of the transmission span. We study a single-span system with noise loading in the transmitter but the results are expected to be applicable also in multi-span systems. The experimental investigation is supported by numerical simulations showing excellent agreement with the experiments. In addition to demonstrating NLPN mitigation we also present a record high sensitivity receiver, enabled by low-noise PSA-amplification, requiring only 4.1 photons per bit to obtain a bit error ratio (BER) of 1×10−3 with 10 GBd quadrature phase-shift keying (QPSK) data.
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| 25. |
- Olsson, Samuel L I, 1984, et al.
(author)
-
Optical Injection-Locking-Based Pump Recovery for Phase-Sensitively Amplified Links
- 2012
-
In: Optics InfoBase Conference Papers. - Washington, D.C. : OSA. - 2162-2701. - 9781467302623 ; , s. Art. no. 6192145-
-
Conference paper (peer-reviewed)abstract
- An injection-locking-based pump recovery system for phase-sensitively amplified links is proposed and studied experimentally. Measurements with 10 Gbaud DQPSK signals show penalty-free recovery of 0.8 GHz FWHM bandwidth pump with 63 dB overall amplification.
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| 26. |
- Olsson, Samuel L I, 1984
(author)
-
Optical Transmission Systems Based on Phase-Sensitive Amplifiers
- 2015
-
Doctoral thesis (other academic/artistic)abstract
- The capacity and reach of today's long-haul fiber optical communication systems is limited by amplifier noise and fiber nonlinearities. Conventional, phase-insensitiveamplifiers (PIAs), have a quantum limited noise figure (NF) of 3 dB at high gain, meaning that with a shot-noise limited input signal the signal-to-noise ratio (SNR)is degraded by at least 3 dB. Phase-sensitive amplifiers (PSAs), have a quantum limited NF of 0 dB, meaning that a shot-noise limited input signal can be amplified without degrading the SNR. The capability of PSAs to provide noiseless amplification makes them interesting for transmission system applications.The objective of this thesis has been to experimentally realize transmission systems based on two-mode PSAs and explore their properties, both experimentally and numerically. We present the first demonstrations of multi-channel compatible and modulation format independent single-span and multi-span PSA-amplifieldtransmission systems. In addition to demonstrating a performance benefit due to reduced amplifier noise we also show that two-mode PSA-amplified transmissionsystems can mitigate distortions originating from fiber nonlinearities, such as selfphase modulation (SPM) and nonlinear phase noise (NLPN).In particular, we demonstrate PSA-amplified transmission of 10 GBd quadrature phase-shift keying (QPSK) and 16-ary quadrature amplitude modulation (16QAM) signals over 105 km single-span transmission systems showing significantperformance improvements, in terms of sensitivity, compared to conventional PIA-amplified transmission systems. In the case of 16QAM transmission the improvedsensitivity allows for 12 dB larger span loss. We also demonstrate PSA-amplified multi-span transmission of a 10 GBd QPSK signal achieving a maximum reach of 3465 km, a threefold reach improvement compared to the maximum reach of 1050 km that was obtained using in-line PIAs at optimal launch power.
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| 27. |
- Olsson, Samuel L I, 1984, et al.
(author)
-
Phase-Sensitive Amplified Optical Link Operating in the Nonlinear Transmission Regime
- 2012
-
In: 38th European Conference on Optical Communication and Exhibition, ECOC 2012, Amsterdam, 16-20 September 2012.
-
Conference paper (peer-reviewed)abstract
- We characterize a phase-sensitive amplifier (PSA) after an 80km fiber span, carrying a single DQPSK channel in the nonlinear transmission regime. The system penalty with increasing intrachannel nonlinear distortion is similar for EDFA and PSA based systems, indicating that the PSA sensitivity advantage remain with nonlinear transmission.
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| 28. |
- Olsson, Samuel L I, 1984, et al.
(author)
-
Phase-Sensitive Amplified Transmission Links for Improved Sensitivity and Nonlinearity Tolerance
- 2015
-
In: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 33:3, s. 710-721
-
Journal article (peer-reviewed)abstract
- In this paper we investigate the properties of transmission links amplified by phase-sensitive amplifiers (PSAs). Using an analytic description we explain the principles enabling improved sensitivity compared to conventional links amplified by phase-insensitive amplifiers (PIAs) and mitigation of nonlinear transmission distortions. We demonstrate these features using numerical simulations and in particular we show the possibility of efficiently mitigating both self-phase modulation (SPM) induced distortions and nonlinear phase noise (NLPN) if the link dispersion map is optimized. The properties of the noise on signal and idler are important and to enable NLPN mitigation the noise must be correlated at the link input. We investigate the role of the dispersion map in detail and show that in a link with standard single mode fiber (SSMF) the optimum dispersion map for efficient nonlinearity mitigation corresponds to pre-compensation of an amount equal to the effective loss length. Furthermore, we experimentally demonstrate both improved sensitivity and mitigation of nonlinearities in a 105 km PSA-amplified link transmitting 10 GBd 16-ary quadrature amplitude modulation (16QAM) data. We measure a combined effect allowing for more than 12 dB larger span loss in a PSA-amplified link compared to a conventional PIA-amplified link to reach the same bit error ratio (BER) of 1×10-3.
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| 29. |
- Olsson, Samuel L I, 1984
(author)
-
Towards Practical Implementation of Phase-Sensitive Amplifier Based Transmission Systems
- 2013
-
Licentiate thesis (other academic/artistic)abstract
- All commercially available optical amplifiers are so-called phase-insensitive amplifiers (PIAs) which degrade the signal-to-noise ratio (SNR) through the amplification process. This kind of amplifier has a quantum limited noise figure (NF) of 3 dB. Another category of amplifiers are phase-sensitive amplifiers (PSAs) which in theory are capable of noiseless amplification, i.e. amplification with a 0 dB NF. Successful implementation of PSAs in transmission systems would lead to significant performance improvements compared to using conventional PIAs. However, the implementation is challenging and no system with wavelength division multiplexing (WDM) compatibility has previously been demonstrated over a significant transmission distance.This thesis is dedicated to realizing and investigating the properties of PSA-amplified transmission links utilizing fiber optical parametric amplifiers (FOPA) and the so-called copier-PSA scheme. One of the main challenges on the way towards realization is to recover and amplify a weak phase-modulated wave with high fidelity. To handle this, a hybrid injection locking (IL)/Erbium-doped fiber amplifier (EDFA)-based pump recovery system was designed and thoroughly investigated experimentally. Other challenges include continuous phase-locking of several waves and high-precision wave tuning.A single-span PSA-amplified transmission link with WDM compatibility was demonstrated over 80 km of fiber. The link performance was compared against a conventional EDFA-based link for operation both in the linear and nonlinear transmission regime. The PSA-amplified system is shown to have capability to mitigate nonlinear distortions due to the Kerr effect and outperform the EDFA-amplified link in both regimes.
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| 30. |
- Richter, Thomas, et al.
(author)
-
Experimental Characterization of a Phase-Sensitive Four-Mode Fiber-Optic Parametric Amplifier
- 2012
-
In: 38th European Conference on Optical Communication and Exhibition, ECOC 2012, Amsterdam, 16-20 September 2012.
-
Conference paper (peer-reviewed)abstract
- Four-mode phase-sensitive amplification is experimentally introduced for the first time. In a proof-of-principle realization using a dual-pump fiber-optic parametric amplifier we achieve nearly 20-dB gain. The influence of the individual phases of the six interacting waves on the signal gain is investigated.
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| 31. |
- Vijayan, Kovendhan, 1991, et al.
(author)
-
Optical Bandwidth Dependency of Nonlinearity Mitigation in Phase-Sensitive Amplifier Links
- 2018
-
In: European Conference on Optical Communication, ECOC. ; 2018-September
-
Conference paper (peer-reviewed)abstract
- We perform an experimental comparison between copier-phase-sensitive amplifier links operating at 10 and 28 Gbaud as well as with and without distributed Raman amplification to study how the effectiveness of the nonlinearity mitigation is affected by the signal symbol rate.
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