| 1. |
- Fougstedt, Christoffer, 1990, et al.
(author)
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Time-Domain Digital Back Propagation: Algorithm and Finite-Precision Implementation Aspects
- 2017
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In: Optics InfoBase Conference Papers. - 2162-2701. - 9781943580231 ; , s. Article no 7937325-
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Conference paper (peer-reviewed)abstract
- We propose a nonlinear mitigation algorithm designed from an ASIC perspective, and analyze implementation aspects. Given 9 signal and 11 coefficient bits, reach is increased by 105% compared to linear compensation in single-channel 16-QAM transmission.
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| 2. |
- Eliasson, Henrik, 1985, et al.
(author)
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Comparison between Coherent Superposition in DSP and PSA for Mitigation of Nonlinearities in a Single-span Link
- 2014
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In: European Conference on Optical Communication, ECOC 2014; Cannes; France; 21 September 2014 through 25 September 2014. - 9782954944401 ; , s. Art. no. 6964015-
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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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| 3. |
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| 4. |
- Eliasson, Henrik, 1985, et al.
(author)
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Mitigation of nonlinear distortion in hybrid Raman/phase-sensitive amplifier links
- 2016
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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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| 5. |
- Eliasson, Henrik, 1985, et al.
(author)
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Mitigation of nonlinearities using conjugate data repetition
- 2015
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In: Optics Express. - 1094-4087 .- 1094-4087. ; 23:3, s. 2392-2402
-
Journal article (peer-reviewed)abstract
- We investigate a time-domain implementation of generalized phase-conjugated twin waves which we call conjugate data repetition. A theory based on time-domain perturbation analysis explaining the mitigation of nonlinear effects is provided, and the concept is evaluated using numerical simulations. Compared to PM-QPSK at the same channel bit rate, the single-channel transmission reach in a conventional system with standard single-mode fiber of conjugate data repetition-QPSK is increased by approximately a factor of 2.
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| 6. |
- Eliasson, Henrik, 1985, et al.
(author)
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Phase-sensitive amplifier link with distributed Raman amplification
- 2018
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In: Optics Express. - 1094-4087 .- 1094-4087. ; 26:16, s. 19854-19863
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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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| 7. |
- Eliasson, Henrik, 1985, et al.
(author)
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Transmitter mask testing for 28 GBaud PM-QPSK
- 2013
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In: Optical Communication (ECOC 2013), 39th European Conference and Exhibition on. - : Institution of Engineering and Technology. - 9781849197595 ; , s. 282 - 284
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Conference paper (peer-reviewed)abstract
- We suggest a method for pass/fail testing of PM-QPSK transmitters. The test is based on mask testing with time-resolved EVM and accepts transmitters where individual impairments cause less than 0.5 dB OSNR penalty. The design of the test is performed by computer simulations followed by experimental verification of some key results.
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| 8. |
- Olsson, Samuel L I, 1984, et al.
(author)
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Long-haul optical transmission link using low-noise phase-sensitive amplifiers
- 2018
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In: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723 .- 2041-1723. ; 9:1
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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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| 9. |
- Vijayan, Kovendhan, 1991, et al.
(author)
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Optical Bandwidth Dependency of Nonlinearity Mitigation in Phase-Sensitive Amplifier Links
- 2018
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In: European Conference on Optical Communication, ECOC. ; 2018-September
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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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