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ABSTRACT: A PON based on coherent heterodyne receivers is presented. The wavelength selectivity and sensitivity of heterodyne receivers enables a filterless ultra-dense WDM system with long reach and simplified logistics, offering 1 Gbit/s sustained datarate per user.
Optical Communication, 2009. ECOC '09. 35th European Conference on; 10/2009
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ABSTRACT: The feasibility of long-haul transmission using differential quadrature phase shift keying (DQPSK) modulation is discussed. We focus in particular on the trade-off between spectral efficiency and reach in optical transmission systems using DQPSK modulation.
Optical Fiber communication/National Fiber Optic Engineers Conference, 2008. OFC/NFOEC 2008. Conference on; 03/2008
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ABSTRACT: We show the influence of 10.7-Gb/s NRZ neighbors on 43-Gb/s polarization-multiplexed NRZ-DQPSK transmission combined with digital coherent equalization. The impact of XPM induced phase noise is reduced with an optimized carrier phase estimation (CPE) algorithm.
Optical Communication (ECOC), 2007 33rd European Conference and Ehxibition of; 10/2007
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ABSTRACT: We discuss coherent equalization to realize robust 111-Gb/s transmission. For 111-Gb/s POLMUX-RZ-DQPSK we experimentally show the advantage of coherent equalization over direction detection for compensation of both chromatic dispersion and differential group delay.
IEEE/LEOS Summer Topical Meetings, 2007 Digest of the; 08/2007
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ABSTRACT: Phase ripple impairments induced through cascaded fiber Bragg gratings (FBGs) are discussed for 42.8-Gb/s transmission. We show the feasibility of transmission over 1140 km (12 times 95 km) using return-to-zero differential quadrature phase-shift keying modulation and FBG-only dispersion compensation. We further compare FBGs with dispersion-compensating fiber for dispersion compensation and analyze the influence of wavelength detuning.
IEEE Photonics Technology Letters 08/2007; · 2.19 Impact Factor
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D. van den Borne,
V. Veljanovski,
E. de Man,
U. Gaubatz,
C. Zuccaro,
C. Paquet,
Y. Painchaud,
S.L. Jansen, E. Gottwald,
G.D. Khoe,
H. de Waardt
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ABSTRACT: We show the feasibility of more cost-effective long-haul transmission using fiber Bragg gratings (FBG) for in-line dispersion compensation. 32xl0.7-Gbit/s NRZ modulated channels are transmitted over 40x95 km of SSMF using low group delay ripple FBGs.
Optical Fiber Communication and the National Fiber Optic Engineers Conference, 2007. OFC/NFOEC 2007. Conference on; 04/2007
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ABSTRACT: An electronic feedback gain control for the suppression of transients in EDFA chains is analyzed. It is shown that the optimal parameters for a single amplifier do not lead to optimal results for cascaded EDFAs.
Optical Fiber Communication and the National Fiber Optic Engineers Conference, 2007. OFC/NFOEC 2007. Conference on; 04/2007
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ABSTRACT: We discuss high spectral efficient long-haul transmission using multilevel modulation formats. In particular, we investigate long-haul transmission with a 1.6-b/s/Hz spectral efficiency using polarization-multiplexed return-to-zero differential quadrature phase-shift keying. In an experimental demonstration, we show 40 times 85.6-Gb/s transmission with a 50-GHz channel spacing over 1700 km (18 times 94.5 km) of standard-single-mode fiber
Journal of Lightwave Technology 02/2007; · 2.78 Impact Factor
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ABSTRACT: A strong bit pattern dependence in optical transmission links employing multilevel modulation formats when pseudorandom binary sequences are used for modulation is demonstrated. The use of pseudorandom quaternary sequences for multilevel modulation is proposed and an efficient method to generate such sequences is presented.
Electronics Letters 02/2007; · 0.96 Impact Factor
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ABSTRACT: We experimentally show the feasibility of long-haul 42.8-Gbit/s RZ-DQPSK transmission with lumped, 285-km spaced, dispersion management. A comparison with periodic dispersion management shows only a slight increase in nonlinear impairments.
Optical Communications, 2006. ECOC 2006. European Conference on; 10/2006
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ABSTRACT: In this paper we investigate the difference in transmission impairments between 42.8-Gbit/s RZ-DPSK and RZ-DQPSK modulation for long-haul transmission on a 50-GHz grid. We analyze the impact of narrowband filtering and discuss the influence it has on long-haul transmission using the RZ-DPSK and RZ-DQPSK modulation formats.
Photonic Networks, 2006 ITG Symposium on; 05/2006
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ABSTRACT: We discuss dispersion and power map optimization for 42.8-Gbit/s RZ-DQPSK DWDM transmission over standard-single-mode-fiber with terrestrial length fiber spans. We experimentally show that long-haul 42.8-Gbit/s RZ-DQPSK transmission is feasible with high tolerances towards deviations in the dispersion map.
Optical Fiber Communication Conference, 2006 and the 2006 National Fiber Optic Engineers Conference. OFC 2006; 04/2006
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ABSTRACT: We discuss an improved detection scheme for differential phase shift keying (DPSK) and differential quadrature phase shift keying (DQPSK), based on multi-symbol phase estimation (MSPE) through electrical signal processing. Using a recursive electrical signal processing algorithm, close to homodyne performance is obtained without a local oscillator at the receiver. In the presence of only Gaussian noise the proposed scheme yields a 0.5 dB and 1.8 dB sensitivity improvement over self-homodyne detection, for DPSK and DQPSK respectively. It furthermore improves robustness against impairments due to the influence of a finite laser linewidth and nonlinear phase noise
Optical Fibre Communications and Electronic Signal Processing, 2005. The IEE Seminar on (Ref. No. 2005-11310); 01/2006
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ABSTRACT: Employing optical phase conjugation with a polarization-diversity periodically-poled lithium-niobate subsystem, we experimentally demonstrate 42.8-Gbit/s RZ-DQPSK DWDM transmission with 0.8-bit/s/Hz spectral efficiency over 4500 km of SSMF without inline dispersion compensation.
Optical Communication, 2005. ECOC 2005. 31st European Conference on; 10/2005
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ABSTRACT: With relatively simple standard transmission equipment, we achieved a wavelength-division-multiplexing transmission with a record-high spectral efficiency of 1.6 b/s/Hz using return-to-zero differential quadrature phase-shift keying and polarization multiplexing over 200-km standard single-mode fiber with a 40-Gb/s capacity per wavelength but 10-GSymbol/s rate.
IEEE Photonics Technology Letters 10/2003; · 2.19 Impact Factor
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ABSTRACT: In summary we fabricated and characterized integrated differential photodetector modules with 35 GHz and 45 GHz electrical bandwidth. The devices show total responsivities of 0.41 A/W and 0.31 A/W respectively and PDL of less than 0.5 dB. The ratio of the photocurrents remains below 0.5 dB for different states of polarization demonstrating an excellent electrical and optical symmetry. The modules deliver high electrical output pulses of differential polarity in the 1 Volt regime to switch directly all known 40 Gbit/s demux electronics implemented in SiGe, GaAs or InP technology.
Optical Fiber Communication Conference and Exhibit, 2002. OFC 2002; 04/2002
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ABSTRACT: Here we report on a new pump scheme which allows for the first time high capacity transmission in the C and L band over unrepeatered distances >200 km. A total capacity of 3.2 Tb/s (80×42.5 Gb/s) over the unrepeatered C+L band transmission distance of 220 km PSCF was achieved. We identified the OSNR as the critical impairment in the experiment and discussed further possibilities for system performance enhancement.
Optical Fiber Communication Conference and Exhibit, 2002. OFC 2002; 04/2002
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ABSTRACT: Channel bit rates of 40 Gbit/s are the next step after 2.5 and 10 Gbit/s in the SONET/SDH hierarchy. We describe transmitter and receiver designs as well as system aspects and new modulation formats.
Lasers and Electro-Optics Society, 2002. LEOS 2002. The 15th Annual Meeting of the IEEE; 02/2002
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ABSTRACT: We have demonstrated automatic polarization control in a field trial over 116 km of SSMF with 16 channel DWDM (100 GHz spacing) based on polarization multiplexed 2×40 Gbit/s NRZ signals for a total capacity of 1.28 Tbit/s after FEC decoding.
Optical Communication, 2001. ECOC '01. 27th European Conference on; 02/2001
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ABSTRACT: Successful bidirectional transmission of 80 channels each carrying
a 40 Gbit/s ETDM signal over 40 km of standard singlemode fibre is
reported for the first time. To the authors' knowledge, the overall data
rate of 3.2 Tbit/s is the highest aggregate capacity demonstrated over a
single fibre
Electronics Letters 10/1999; · 0.96 Impact Factor
