| 261. |
- Lorences Riesgo, Abel, 1987, et al.
(författare)
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Demonstration of Degenerate Vector Phase-Sensitive Amplification
- 2013
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Ingår i: Optical Communication (ECOC 2013), 39th European Conference and Exhibition on. - : Institution of Engineering and Technology. - 9781849197595 ; :622 CP, s. 492-494
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Konferensbidrag (refereegranskat)abstract
- The performance of a degenerate vector (dual cross-polarized pump) phase-sensitive amplifier (PSA) is characterized and compared to a degenerate scalar (dual co-polarized pump) PSA. In both schemes, we assess the gain as a function of the signal state of polarization, verifying its compliance with theory, and the phase transfer function.
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| 262. |
- Lorences Riesgo, Abel, 1987, et al.
(författare)
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Experimental analysis of degenerate vector phase-sensitive amplification
- 2014
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Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 22:18, s. 21889-21902
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Tidskriftsartikel (refereegranskat)abstract
- We comprehensively investigate a degenerate vector phase-sensitive amplifier (PSA). We determine the gain dependence on the relative phase and polarization angle between the pumps and the degenerate signal wave. The vector PSA is experimentally shown to be sensitive to the pump states of polarization (SOP) due to polarization mode dispersion in the fiber. However, the scheme performance agrees well with theory under specific pump SOPs and we achieve an on-off gain over 10 dB with a small deviation from the theoretically expected results. In comparison to the scalar scheme, the proposed vector scheme has larger tolerance for pump depletion due to four-wave mixing between pumps and generation of higher-order idlers.
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| 263. |
- Lorences Riesgo, Abel, 1987, et al.
(författare)
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Frequency-Comb Regeneration for Self-Homodyne Superchannels
- 2016
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 34:8, s. 1800-1806
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Tidskriftsartikel (refereegranskat)abstract
- We propose and demonstrate frequency-comb regeneration using injection locking and a parametric mixer. We theoretically evaluate the effect of the dispersive walk-off between the two unmodulated carriers from which the comb is regenerated. We calculate the maximum number of carriers which can be regenerated as a function of the laser linewidth and transmission distance when considering dispersion-unmanaged links. Experimentally, we demonstrate a 70 line comb generation without major linewidth degradation from two carriers with 15 dB optical signal-to-noise ratio (OSNR). The low OSNR operation is achieved by the use of optical injection locking. We also evaluate the degradation in the comb regeneration when the carriers are temporally decorrelated in order to emulate the effect of dispersive walk-off. When the temporal delay is 1.5 ns, the comb regeneration does not suffer from major degradation but when the delay is 10 ns, only 30 carriers can be regenerated without linewidth degradation, which agrees with our theoretical analysis.
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| 264. |
- Lorences Riesgo, Abel, 1987, et al.
(författare)
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Frequency-Comb Regeneration for Self-Homodyne Superchannels
- 2015
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Ingår i: 41st European Conference on Optical Communication, ECOC 2015, Valencia, Spain, 27 September - 1 October 2015. - 9788460817413 ; , s. paper We.3.6.2-
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Konferensbidrag (refereegranskat)abstract
- We demonstrate frequency-comb regeneration from two received unmodulated carriers usinga parametric mixer. For 10 dB optical signal-to-noise ratio of the unmodulated carriers, up to 60 carriersare generated without linewidth degradation.
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| 265. |
- Lorences Riesgo, Abel, 1987, et al.
(författare)
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Phase-Sensitive Amplification and Regeneration of Dual-Polarization BPSK without Polarization Diversity
- 2014
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Ingår i: 2014 European Conference on Optical Communication, ECOC 2014; Cannes; France; 21 September 2014 through 25 September 2014. - 9782954944401 ; , s. Art. no. 6964045-
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Konferensbidrag (refereegranskat)abstract
- We analyze the performance of a degenerate vector PSA-based receiver and compare to an EDFA-based receiver, achieving an about 1 dB sensitivity improvement. We also assess the phase regeneration provided by the vector PSA when the signal phase is degraded.
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| 266. |
- Lorences Riesgo, Abel, 1987, et al.
(författare)
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Phase-Sensitive Amplification of 28 GBaud DP-QPSK Signal
- 2015
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Ingår i: 2015 Optical Fiber Communications Conference and Exhibition, OFC 2015, Los Angeles, United States, 22-26 March 2015. - Washington, D.C. : OSA. - 9781557529374 ; , s. 7122090-
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Konferensbidrag (refereegranskat)abstract
- We demonstrate, for the first time, amplification of a DP-QPSK signal using a vector phase-sensitive amplifier (PSA). The PSA-based receiver shows an about 0.7 dB sensitivity improvement compared to an EDFA-based receiver.
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| 267. |
- Lorences Riesgo, Abel, 1987, et al.
(författare)
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Polarization-Independent Phase-Sensitive Amplification
- 2016
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Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 34:13, s. 3171-3180
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Tidskriftsartikel (refereegranskat)abstract
- We thoroughly analyze the requirements on the signal and idler state of polarizations (SOPs) for achieving maximum amplification in phase-sensitive amplifiers (PSAs). These requirements are described using a Jones-space description as well as a Stokes-space description. Our analysis includes the cases of polarization-diverse and vector PSAs, and in each type of PSA, we also consider the signal-degenerate and the non-degenerate schemes. We observe that the relation between the signal and idler SOPs to achieve maximum phase-sensitive (PS) amplification can be described similarly in polarization-diverse and in vector PSAs. Moreover, both types of PSAs are polarization-dependent, which means that PSAs do require polarization-tracking schemes when being implemented in a realistic optical-transmission scenario. We therefore evaluate how polarization tracking of the signal and the idler SOPs can overcome the theoretical polarization dependence of both polarization-diverse and vector PSAs. We find that only one polarization tracker for either the signal or idler SOP is necessary for achieving polarization-independent PS amplification when considering the general case of dual-polarization (DP) modulated signals. This polarization tracker requires the control of three degrees of freedom which describe a general polarization rotation. For single-polarization (SP) modulated signals, the polarization tracker can rotate both the signal and the idler SOPs simultaneously which eliminates the need for splitting the signal and the idler before the PSA. Moreover, only two degrees of freedom for the polarization tracker are necessary in this case. When considering degenerate schemes, a polarization tracker with two degrees of freedom is sufficient to achieve maximum PS amplification of DP binary phase-shift keying (BPSK) signals in both vector and polarization diverse PSAs. For the case of SP-BPSK signals, a polarization-diverse PSA can perform polarization-independent amplification by controlling the relative phase between the pumps, whereas a polarization tracker with only one degree of freedom is necessary in the case of vector PSAs.
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| 268. |
- Lorences Riesgo, Abel, 1987, et al.
(författare)
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Quadrature decomposition of a 20 Gbaud 16-QAM signal into 2×4-PAM signals
- 2016
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Ingår i: 2016 European Conference in Optical Communication.
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Konferensbidrag (refereegranskat)abstract
- We propose a novel phase-sensitive processor capable of operating at low nonlinear phase shifts. With a nonlinear phase shift of 2 0.15 rad, quadrature decomposition is demonstrated with penalty of 0.5 dB at BER=10E-3.
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| 269. |
- Lorences Riesgo, Abel, 1987, et al.
(författare)
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Quadrature demultiplexing using a degenerate vector parametric amplifier
- 2014
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Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 22:24, s. 29424-29434
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Tidskriftsartikel (refereegranskat)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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| 270. |
- Lorences Riesgo, Abel, 1987, et al.
(författare)
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Self-homodyne 24×32-QAM superchannel receiver enabled by all-optical comb regeneration using Brillouin amplification
- 2016
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Ingår i: Optics Express. - : The Optical Society. - 1094-4087 .- 1094-4087. ; 24:26, s. 29714-29723
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate and characterize an all-optical self-homodyne (SH) frequency superchannel enabled by comb regeneration at the receiver. In order to generate the superchannel, we use a frequency comb with 26 carriers spaced by 25 GHz at the transmitter, from which 24 carriers are modulated with polarization-multiplexed 32 quadrature amplitude modulation (PM 32-QAM) data. To enable comb regeneration at the receiver side, the two central carriers remain unmodulated. High fidelity comb regeneration is achieved by filtering the two unmodulated carriers with an approximately 25 MHz wide optical filter based on Brillouin amplification before a parametric mixer. The carriers from the regenerated comb are then used as local oscillator for SH detection. We demonstrate that all 24 carriers can be detected with an optical signal-to-noise ratio (OSNR) penalty lower than 2.5 dB in a back-to-back scenario. We also demonstrate that the whole superchannel can be transmitted through 120 km of single-mode fiber (SMF) and be detected with bit-error rate (BER) below 0.015.
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