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J-X Cai,
H G Batshon,
H Zhang, C R Davidson,
Y Sun,
M Mazurczyk,
D G Foursa,
O Sinkin,
A Pilipetskii,
G Mohs,
Neal S Bergano
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ABSTRACT: We transmit 250x100G PDM RZ-16QAM channels with 5.2 b/s/Hz spectral efficiency over 5,530 km using single-stage C-band EDFAs equalized to 40 nm. We use single parity check coded modulation and all channels are decoded with no errors after iterative decoding between a MAP decoder and an LDPC based FEC algorithm. We also observe that the optimum power spectral density is nearly independent of SE, signal baud rate or modulation format in a dispersion uncompensated system.
Optics Express 01/2013; 21(2):1555-60. · 3.59 Impact Factor
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ABSTRACT: We transmit 160 x 100 G PDM RZ 16 QAM channels with 5.2 bits/s/Hz spectral efficiency over 6,860 km. There are more than 3 billion 16 QAM symbols, i.e., 12 billion bits, processed in total. Using coded modulation and iterative decoding between a MAP decoder and an LDPC based FEC all channels are decoded with no remaining errors.
Optics Express 05/2012; 20(11):11688-93. · 3.59 Impact Factor
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ABSTRACT: We demonstrated that simple pre-filtering at the transmitter to constrain the channel bandwidth together with a maximum a posteriori probability (MAP) detection algorithm can significantly improve spectral efficiency (SE). 96 × 100-Gb/s bandwidth-constrained polarization-division-multiplexing return- to-zero-QPSK channels were transmitted with 300% SE over 10 610 km using 52-km spans of 150-μ m <sup>2</sup> fiber and simple single-stage erbium-doped fiber amplifiers without any Raman amplification. We also achieved 400% SE over 4370 km using similar techniques.
Journal of Lightwave Technology 03/2011; · 2.78 Impact Factor
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J.-X. Cai,
Y. Cai,
Y. Sun, C.R. Davidson,
D.G. Foursa,
A. Lucero,
O. Sinkin,
W. Patterson,
A. Pilipetskii,
G. Mohs,
N.S. Bergano
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ABSTRACT: We transmit 112×112 Gb/s pre-filtered PDM RZ-QPSK channels with 360% spectral efficiency over 9,360km with the channel spacing set to the baud rate. This results in a record spectral efficiency for transpacific distance.
Optical Communication (ECOC), 2010 36th European Conference and Exhibition on; 10/2010
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ABSTRACT: We propose a high spectral efficiency transmission scheme employing tight pre-filtering and maximum-a-posteriori-probability (MAP) detection. We demonstrate that pre-filtering induced inter-symbol-interference can be effectively compensated with MAP detection after transoceanic transmission.
Optical Communication (ECOC), 2010 36th European Conference and Exhibition on; 10/2010
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Jin-Xing Cai, C.R. Davidson,
M. Nissov,
Haifeng Li,
W.T. Anderson,
Yi Cai,
Li Liu,
A.N. Pilipetskii,
D.G. Foursa,
W.W. Patterson,
P.C. Corbett,
A.J. Lucero,
N.S. Bergano
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ABSTRACT: This paper investigated the impact of receiver dispersion slope compensation for 40-Gb/s transoceanic transmission over conventional nonzero dispersion shifted fibers. Various differential phase-shift keying (DPSK) modulation formats were experimentally compared at 42.8 Gb/s [to account for forwarded error correction (FEC) overhead] with dispersion slope compensators at the receiver. These transmission measurements were performed in a circulating loop over a transatlantic distance of 6250 km using a variety of channel spacings, relative polarizations, and synchronous modulation techniques. All formats benefited from receiver dispersion slope compensation. For orthogonally polarized channels on 133-GHz spacing, the return-to-zero DPSK (RZ-DPSK) format performed the best; all channels (18 × 40 Gb/s) propagated with > 13.5-dB Q-factor and with > 4-dB FEC margin. Whereas for copolarized channels on 100-GHz spacing, carrier-suppressed return-to-zero (CSRZ)-DPSK performed the best; all channels (25 × 40 Gb/s) propagated with > 3-dB FEC margin. Moreover, it was shown that parallel launch only suffered a penalty of ∼ 0.2 and ∼ 0.5 dB relative to the orthogonal launch for 133and 100-GHz channel spacing, respectively. Finally, it was demonstrated that copolarized 40 Gb/s RZ-DPSK worked as well as 10 Gb/s RZ-ON-OFF keying (RZ-OOK) for the same spectral efficiency (30%) over the 6250 km of conventional nonzero dispersion shifted fibers (NZ-DSF) originally designed for 10 Gb/s transmission.
Journal of Lightwave Technology 02/2006; · 2.78 Impact Factor
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J.-X. Cai,
M. Nissov, C. R. Davidson,
W. Anderson,
Y. Cai,
A. N. Pilipetskii,
D. G. Foursa,
W. W. Patterson,
P. C. Corbett,
A. J. Lucero,
Neal S. Bergano
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ABSTRACT: We demonstrated a substantial improvement in FEC margin at 40 Gb/s using bit-synchronously modulated RZ-DQPSK. We transmitted 28×40 Gb/s CRZ-DQPSK channels over 6,550 km with ~2 dB of actual FEC margin, without any PMD compensation.
01/2006;
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ABSTRACT: Various DPSK modulation formats were experimentally compared at 40 Gb/s using non slope-matched fiber spans. All formats benefited from dispersion slope compensation. For co-polarized channels on 100 GHz spacing CSRZ-DPSK worked best.
Optical Communication, 2005. ECOC 2005. 31st European Conference on; 10/2005
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J.-X. Cai, C.R. Davidson,
D.G. Foursa,
L Liu,
Y Cai,
B. Bakhshi,
G. Mohs,
W.W. Patterson,
P.C. Corbett,
A.J. Lucero,
W. Anderson,
H Li,
M. Nissov,
A.N. Pilipetskii,
N.S. Bergano
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ABSTRACT: The RZ-DPSK and NRZ-DPSK modulation formats were experimentally compared using installed undersea fiber links. Our results show a 1-1.5 dB RZ benefit with optimized RZ modulation depth for both 25-GHz and 33-GHz spaced channels.
Optical Fiber Communication Conference, 2005. Technical Digest. OFC/NFOEC; 04/2005
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ABSTRACT: We use a simple model to analyze the polarization driven performance fluctuations in an optical transmission system. The model shows good agreement with data accumulated over a long period of time on deployed systems.
Optical Fiber Communication Conference, 2005. Technical Digest. OFC/NFOEC; 04/2005
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J.-X. Cai, C.R. Davidson,
M. Nissov,
H Li,
W. Anderson,
Y Cai,
L Liu,
A.N. Pilipetskii,
D.G. Foursa,
W.W. Patterson,
P.C. Corbett,
A.J. Lucero,
N.S. Bergano
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ABSTRACT: We successfully transmitted 18×40 Gb/s RZ-DPSK channels over 6,250 km of non-slope-matched-fibers with >4 dB FEC margin using dispersion-slope compensators at the receiver. We demonstrated that 40 Gb/s DPSK worked as well as 10 Gb/s RZ-OOK for the same spectral efficiency.
Optical Fiber Communication Conference, 2005. Technical Digest. OFC/NFOEC; 04/2005
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J.-X. Cai,
D.G. Foursa,
L. Liu, C.R. Davidson,
Y. Cai,
W.W. Patterson,
A.J. Lucero,
B. Bakhshi,
G. Mohs,
P.C. Corbett,
V. Gupta,
W. Anderson,
M. Vaa,
G. Domagala,
M. Mazurczyk,
H. Li,
S. Jiang,
M. Nissov,
A.N. Pilipetskii,
N.S. Bergano
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ABSTRACT: This work presents the first field trial using the return-to-zero differential-phase-shift-keying (RZ-DPSK) modulation format. A 96×10-Gb/s RZ-DPSK field trial was conducted over a 13 100-km optical undersea path by double passing the installed 6550-km underwater link which was deployed with non-slope-matched submarine fibers. All channels performed with more than a 3-dB forward-error correction margin, including channels that accumulated over ±13 000ps/nm of dispersion. It is also shown that the RZ-DPSK format has similar residual dispersion and channel power tolerance for both slope-matched and non-slope-matched fibers. Furthermore, it is demonstrated that the chirped RZ-DPSK format could further improve system performance by 1-2 dB.
Journal of Lightwave Technology 02/2005; · 2.78 Impact Factor
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J.-X. Cai,
D. G. Foursa,
L. Liu, C. R. Davidson,
Y. Cai,
W. W. Patterson,
A. J. Lucero,
B. Bakhshi,
G. Mohs,
P. C. Corbett,
V. Gupta,
W. Anderson
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ABSTRACT: This paper presents the first field trial using the return-to-zero differential-phase-shift-keying (RZ-DPSK) modulation format. A 96 x 10-Gb/s RZ-DPSK field trial was conducted over a 13100-km optical undersea path by double passing the installed 6550-km underwater link which was deployed with non-slope-matched submarine fibers. All channels performed with more than a 3-dB forward-error correction margin, including channels that accumulated over +/-13 000 ps/nm of dispersion. It is also shown that the RZ-DPSK format has similar residual dispersion and channel power tolerance for both slope-matched and non-slope-matched fibers. Furthermore, it is demonstrated that the chirped RZ-DPSK format could further improve system performance by 1-2 dB.
IEEE/OSA Journal of Lightwave Technology - J LIGHTWAVE TECHNOL. 01/2005; 23(1):95-103.
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ABSTRACT: Transmission of 12.5 Gbit/s RZ-DQPSK signals over 6500 km with different channel spacings is presented. We demonstrate the feasibility of trans-oceanic transmission using DQPSK in DWDM systems with up to 0.66 bit/s/Hz spectral efficiency.
Advanced Modulation Formats, 2004 IEEE/LEOS Workshop on; 08/2004
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ABSTRACT: The first transoceanic transmission experiment using optical differential quadrature phase-shift keying (DQPSK) is presented. The long-haul transmission capabilities of RZ-DQPSK in a 64-channel WDM system have been demonstrated by transmitting 12.5 Gbit/s RZ-DQPSK.
Electronics Letters 05/2004; · 0.96 Impact Factor
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ABSTRACT: In this paper we discuss the merits of synchronous polarization control in circulating loop transmission experiments. We discuss the role of loop length, Q-factor fluctuations, and polarization evolution.
Optical Fiber Communication Conference, 2004. OFC 2004; 03/2004
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Jin-Xing Cai,
M. Nissov, C.R. Davidson,
A.N. Pilipetskii,
G. Mohs,
Haifeng Li,
Yi Cai,
E.A. Golovchenko,
A.J. Lucero,
D.G. Foursa,
N.S. Bergano
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ABSTRACT: We present an experimental investigation of 40 Gb/s transmission technology aimed at an aggregate capacity exceeding 1 Tb/s over multithousand kilometer transmission distances. These studies have been performed using a variety of dispersion management and modulation techniques. The transmission distances investigated range from a minimum of 2000 km, which is considered a regional undersea cable distance, up to a transatlantic distance of 6200 km. Our regional distance experiments were performed using both slope-matched and conventional dispersion maps where the accumulated dispersion becomes large for the edge channels. Dispersion map studies showed that slope-matched fiber performs better than nonslope-matched fiber (NZDSF) beyond 2000 km due to its larger effective area and lower accumulated dispersion slope. The demonstration of 38×40 Gb/s over 6200 km was the first transoceanic length experiment using 40 Gb/s DWDM channels. This was achieved with a relatively simple amplifier chain that uses only C-band EDFAs. Modulation format studies showed that RZ performs better over transoceanic distance, carrier-suppressed RZ performs better with nonslope-matched fiber at a distance of 2055 km, and prefiltered carrier-suppressed RZ is more suited for higher spectral efficiency. Experimental techniques for high bit-rate experiments are presented.
Journal of Lightwave Technology 01/2003; · 2.78 Impact Factor
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ABSTRACT: High-data-rate transmission at 20 Gb/s has been demonstrated over both Trans-Atlantic and Trans-Pacific distances. To make 40 Gb/s systems economically viable it is important to achieve the data rate increase without significantly increasing complexity. This ensures that the inherent advantages of high-bit-rate transmission are realized: reduced cost, power consumption, and floor space.
Optical Fiber Communication Conference and Exhibit, 2002. OFC 2002; 04/2002
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D.G. Foursa, C.R. Davidson,
M. Nissov,
M.A. Mills,
L. Xu,
J.X. Cai,
A.N. Pilipetskii,
Y. Cai,
C. Breverman,
R.R. Cordell,
T.J. Carvelli,
P.C. Corbett,
H.D. Kidorf,
N.S. Bergano
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ABSTRACT: Two hundred and fifty six 10 Gb/s WDM channels were transmitted over 11,000 km in 80 nm of continuous optical bandwidth of hybrid Raman/EDFA for the first time. Using FEC all channels were decoded error free.
Optical Fiber Communication Conference and Exhibit, 2002. OFC 2002; 04/2002
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ABSTRACT: Transmission of 40 Gb/s signals over long distances presents numerous technical challenges. Rapid progress in key enabling technologies has allowed laboratory transmission demonstration of 40 Gb/s DWDM channels over transoceanic distances
Optical Communication, 2002. ECOC 2002. 28th European Conference on; 02/2002
