| 1. |
- Lu, Guo-Wei, 1976, et al.
(författare)
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Format Conversion From 120-Gb/s RZ-D8PSK to 80-Gb/s RZ-DQPSK Through FWM-Based Optical Phase Erasure
- 2010
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Ingår i: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 22:24, s. 1817-1819
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Tidskriftsartikel (refereegranskat)abstract
- An optical format conversion scheme from 120-Gb/s return-to-zero differential 8-ary phase-shift keying (RZ-D8PSK) to 80-Gb/s RZ differential quadrature phase-shift keying (RZ-DQPSK) is demonstrated by optically removing one tributary through optical phase erasure. It is achieved through four-wave mixing in a highly nonlinear fiber. An 8-dB sensitivity improvement is obtained for the converted DQPSK signal relative to that of the input D8PSK signal. This is potentially useful to enable the interconnection among neighboring networks where different formats are deployed.
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| 2. |
- Lu, Guo-Wei, 1976, et al.
(författare)
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Format Conversion of Optical Multilevel Signals Using FWM-Based Optical Phase Erasure
- 2011
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 29:16, s. 2460-2466
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Tidskriftsartikel (refereegranskat)abstract
- An optical format conversion scheme of multilevel phase-shift keying (M-ary PSK) signals using the four-wave mixing based optical phase erasure is discussed in this paper. The conversion from differential quadrature phase-shift keying (DQPSK) to differential phase shift keying at 10 and 160 Gbaud, and the conversion from differential eight-ary phase-shift keying to DQPSK at 40 Gbaud have been experimentally demonstrated. The proposed scheme could be used as a phase erasure, in which a redundant tributary of the M-ary PSK signal is removed, or as an "updater" where the unwanted phase pattern is replaced with the new pattern.
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| 3. |
- Olsson, Samuel L I, 1984, et al.
(författare)
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Injection locking-based pump recovery for phase-sensitive amplified links
- 2013
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Ingår i: Optics Express. - : The Optical Society. - 1094-4087 .- 1094-4087. ; 21:12, s. 14512-14529
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Tidskriftsartikel (refereegranskat)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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| 4. |
- Olsson, Samuel L I, 1984, et al.
(författare)
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Optical Injection-Locking-Based Pump Recovery for Phase-Sensitively Amplified Links
- 2012
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Ingår i: Optics InfoBase Conference Papers. - Washington, D.C. : OSA. - 2162-2701. - 9781467302623 ; , s. Art. no. 6192145-
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Konferensbidrag (refereegranskat)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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| 5. |
- Tipsuwannakul, Ekawit, 1982, et al.
(författare)
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0.87 Tbit/s 160 Gbaud dual-polarization D8PSK OTDM transmission over 110 km
- 2010
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Ingår i: ECOC'10, European Conference on Optical Communication. - 9781424485369 ; , s. W.6.C.4-
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Konferensbidrag (refereegranskat)abstract
- The feasibility of transmitting 0.87 Tbit/s dual polarization D8PSK-OTDM over 110 km is, for the first time, demonstrated along with 0.44 Tbit/s single polarization D8PSK-OTDM over 220 km in conventional 55-km span SMF+DCF link. ©2010 IEEE.
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| 6. |
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| 7. |
- Tong, Zhi, 1977, et al.
(författare)
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Towards the Ultra-Sensitive Optical Link Enabled by Low Noise Phase-Sensitive Amplifiers
- 2011
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Ingår i: Nature Photonics. - 1749-4885 .- 1749-4893. ; 5:7, s. 430-436
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Tidskriftsartikel (refereegranskat)abstract
- Optical phase-sensitive amplifiers (PSAs) are known to be capable, in principle, of realizing noiseless amplification and improving the signal-to-noise-ratio of optical links by 3 dB compared to conventional, phase-insensitively amplified links. However, current state-of-the-art PSAs are still far from being practical, lacking e.g. significant noise performance improvement, broadband gain and modulation-format transparency. Here we demonstrate experimentally, for the first time, an optical-fiber-based non-degenerate PSA link consisting of a phase-insensitive parametric copier followed by a PSA that provides broadband amplification, signal modulation-format independence, and nearly 6-dB link noise-figure (NF) improvement over conventional, erbium-doped fiber amplifier based links. The PSA has a record-low 1.1-dB NF, and can be extended to work with multiple wavelength channels with modest system complexity. This concept can also be realized in other materials with third-order nonlinearities, and is useful in any attenuation-limited optical link.
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| 8. |
- Andrekson, Peter, 1960, et al.
(författare)
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Phase-Sensitive Fiber-Optic Parametric Amplifiers and their Applications (Invited paper)
- 2010
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Ingår i: Proc. European Conference on Optical Communications (ECOC). - 9781424485352 ; , s. We.6.E.1-
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Konferensbidrag (refereegranskat)abstract
- We review some fundamental and practical aspects of fiber-optic parametric amplifiers (FOPAs). In particular, their unique phase-sensitive amplification ability along with the corresponding ultralow noise figure will be discussed. Applications of both phase-insensitive and phase-sensitive FOPAs will also be covered.
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| 9. |
- Chavez Boggio, José Manuel, et al.
(författare)
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Double-pumped FOPA with 40 dB flat gain over 81 nm bandwidth
- 2008
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Ingår i: ECOC 2008, 21-25 September 2008, Brussels, Belgium. ; , s. Tu.3.B.5-
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Konferensbidrag (refereegranskat)abstract
- We report the construction and characterization of a record performance continuous-wave double-pumpedfiber-optical parametric amplifier exhibiting 40 dB flat gain over 81nm bandwidth.
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| 10. |
- Corcoran, William, 1983, et al.
(författare)
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Mitigation of Nonlinear Impairments on QPSK Data in Phase-Sensitive Amplified Links
- 2013
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Ingår i: 39th European Conference on Optical Communication and Exhibition, ECOC 2013, London, 22-26 September 2013. - : Institution of Engineering and Technology. - 9781849197595 ; :622 CP, s. 486-488
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Konferensbidrag (refereegranskat)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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