Implementation of differential precoder for high-speed optical DQPSK transmission

Serbay, M.; Wree, C.; Rosenkranz, Werner

doi:10.1049/el:20046312

Cited by 23 publications

(8 citation statements)

References 3 publications

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“…For experimental evaluation of DQPSK modulation, a pseudo random quaternary sequence (PRQS) can be used to ensure that all possible sequences up to a given length are tested [12]. A commercial transponder, on the other hand, requires pre-coding of the transmitted data [13,14]. In the receiver, DQPSK modulation is usually combined with direct detection.…”

Section: Dqpsk Modulationmentioning

confidence: 99%

DQPSK modulation for robust optical transmission

Borne

Jansen

Gottwald

et al. 2008

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference

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Section: Dqpsk Modulationmentioning

confidence: 99%

DQPSK modulation for robust optical transmission

Borne

Jansen

Gottwald

et al. 2008

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference

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“…This precoder is thus more complex compared to what is used in digital wireless communications. The logic operations of the precoder used in this paper are [24] …”

Section: Transmittermentioning

confidence: 99%

Intersymbol interference in DQPSK fibre‐optic systems

Zhao¹,

Agrell²,

Karlsson³

2009

Trans Emerging Tel Tech

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SUMMARYThe limited bandwidth of high-speed transmitter and receiver hardware gives rise to intersymbol interference (ISI) in digital communication systems. The influence of such ISI is investigated in a low-complexity fibreoptical setting, using differential quaternary phase-shift keying (DQPSK) modulation. The ISI is approximated by a memoryless, stochastic model, for use in applications where neither equalisation nor sequence detection can be afforded. The channel capacity of this model is calculated and shown to depend strongly on the transmitter calibration. More than 3 dB is gained, at a target bit error rate (BER) of 10 −6 , by allowing the transmitted phase levels to deviate from their nominal multiples of π/2 by up to 7%.

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“…However, the optical transmitters reported in Serbay et al (2004); Ohm (2004); Seimetz (2006); Binh (2007) require a pre-coder with high complexity. On the contrary, the configuration reported by Djordjevic and Vasic (2006); Tran et al (2006) utilizes the Gray mapping technique to differentially encode the phase information and this significantly reduce the complexity of the optical transmitter.…”

Section: Configuration Of 8-dpsk_2-ask Optical Transmittermentioning

confidence: 99%

“…Recently different coding techniques such as low-density parity-check (LDPC) have been applied to M-ary differential QAM to obtain at least 8 dB gain in the receiver sensitivity under direct detection (Djordjevic and Vasic 2006;Serbay et al 2004). M-ary amplitude and differential phase modulation formats have also been employed to lower the effective symbol rate to combat dispersion and nonlinear effects (Binh 2007;Ohm 2004).…”

Section: Introductionmentioning

confidence: 99%

Dual-ring 16-Star QAM direct and coherent detection in 100 Gb/s optically amplified fiber transmission: simulation

Bình

2008

Opt Quant Electron

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This paper presents the transmission performances, by simulation, of optical communication systems over 10 spans of dispersion compensated and optically amplified fiber distance with a bit rate of 100 Gb/s, by employing modulation formats of two amplitude levels and 8 phase states per amplitude level, the 2R-16-Star QAM constellation under direct and coherent detection with and without phase estimation. Different ring ratios of the amplitude levels are examined and associate transmission performances are reported. Optical signal to noise ratio is achieved with 18 dB and 23 dB for back to back and long haul transmission cases with a dispersion tolerance of ±67 ps/nm at 2 dB power penalty of the eye opening at 100 Gb/s. Monte-Carlo simulation is also performed and a receiver sensitivity of −15 dBm is achieved for a BER of 10 −5 under direct detection after 1100 km of dispersioncompensated and optically amplified transmission. Transmission performances, bit error rate versus receiver sensitivity, are also confirmed with the use of the eye diagram and associate multiple-peaks statistical spectral density distribution. For 100 Gb/s 2R-16-Star QAM coherent transmission, an improvement of the receiver sensitivity of 2.5 dB and 3.5 dB is obtained for coherent detection without phase estimation and respectively. Under coherent detection with phase estimation, the chromatic dispersion tolerance reaches ±100 ps/nm for a 2 dB eye opening penalty at 100 Gb/s bit rate. Comparative studies of the transmission performances of the Star and Square QAM modulation formats are also conducted under the fiber linear and nonlinear effects and detection with and without phase estimation.

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Implementation of differential precoder for high-speed optical DQPSK transmission

Cited by 23 publications

References 3 publications

DQPSK modulation for robust optical transmission

DQPSK modulation for robust optical transmission

Intersymbol interference in DQPSK fibre‐optic systems

Dual-ring 16-Star QAM direct and coherent detection in 100 Gb/s optically amplified fiber transmission: simulation

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