High-Sensitivity 40-Gb/s RZ-DPSK With Forward Error Correction

Spellmeyer, Neal; Gottschalk, Jeffrey; Caplan, D.O.; Stevens, Mark L.

doi:10.1109/lpt.2004.827417

Cited by 33 publications

(17 citation statements)

References 15 publications

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“…7(b)] has received considerable attention by the FSO community and the telecom industry due to a ∼3 dB sensitivity improvement over commonly used on-off-keying, and reduced peak power which mitigates nonlinear effects [24,25,41,[128][129][130][131][132][133]. NRZ-DPSK can be implemented with a constant envelope, so that the peak power is equal to the average.…”

Section: Differential-phase-shift-keying (Dpsk)mentioning

confidence: 99%

“…61, the best PSK demonstration reported uncoded sensitivity about 2.5 dB from theory at 4 Mbps [157]. In the Gbit/s regime the best PSK performance degraded to ∼6 dB from theory at ∼6 Gbps and ∼9 dB from theory at ∼8 Gbps [158], providing little benefit over optically preamplified DPSK, which is a WDM-scalable approach with numerous demonstrations of comparable or better performance in terms of sensitivity and data rate [24,25,41,[128][129][130]133,159]. The nearly 4× sensitivity benefit PSK has over OOK is in part due to binary PSK being an antipodal format, in which a "0" is represented by signal field of -1 (π phase) and a "1" is represented by a 1 (phase of 0), so that 2-PSK has twice the signal-distance of OOK.…”

Section: Phase-shift-keying (Psk)mentioning

confidence: 99%

“…For a quantum-limited optically preamplified DPSK receiver with optimal coding, Shannon-limited performance approaches 3 PPB with ∼0.5 bit/s/Hz efficiency. Highrate optically-preamplified receivers using 24.6% and 7% low-overhead forward error correction (FEC) with 0.8 and 0.935 bits/s/Hz efficiencies have demonstrated 7 and 9 PPB receiver sensitivities at 10 and 40 Gbit/s data rates, respectively [24,25].…”

Section: Introductionmentioning

confidence: 99%

“…Given an optically preamplified DPSK receiver with near-quantum-limited performance this could improve sensitivities to ∼6 PPB, within ∼3 dB of the AWGN Shannon limit for DPSK. The benefits of such low-complexity FEC codes have been demonstrated at 10 [41] and 40 Gbps [25] data rates. They have also become commonly used in the telecom industry as a means of diminishing nonlinear impairments and increasing overall system throughput.…”

Section: Introductionmentioning

confidence: 99%

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Laser communication transmitter and receiver design

Caplan

2007

J Optic Comm Rep

117

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Free-space laser communication systems have the potential to provide flexible, high-speed connectivity suitable for long-haul intersatellite and deep-space links. For these applications, power-efficient transmitter and receiver designs are essential for cost-effective implementation. State-of-the-art designs can leverage many of the recent advances in optical communication technologies that have led to global wideband fiber-optic networks with multiple Tbit/s capacities. While spectral efficiency has long been a key design parameter in the telecommunications industry, the many THz of excess channel bandwidth in the optical regime can be used to improve receiver sensitivities where photon efficiency is a design driver. Furthermore, the combination of excess bandwidth and average-power-limited optical transmitters has led to a new paradigm in transmitter and receiver design that can extend optimized performance of a single receiver to accommodate multiple data rates. This paper discusses state-of-the-art optical transmitter and receiver designs that are particularly well suited for average-power-limited photon-starved links where channel bandwidth is readily available. For comparison, relatively simple direct-detection systems used in short terrestrial or fiber optic links are discussed, but emphasis is placed on mature high-performance photon-efficient systems and commercially available technologies suitable for operation in space. The fundamental characteristics of optical sources, modulators, amplifiers, detectors, and associated noise sources are reviewed along with some of the unique properties that distinguish laser communication systems and components from their RF counterparts. Also addressed is the interplay between modulation format, transmitter waveform, and receiver design, as well as practical tradeoffs and implementation considerations that arise from using various technologies.

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Section: Differential-phase-shift-keying (Dpsk)mentioning

confidence: 99%

Section: Phase-shift-keying (Psk)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Laser communication transmitter and receiver design

Caplan

2007

J Optic Comm Rep

117

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“…17 In particular, an experimental demonstration achieved 8.7-PPB at 40-Gb∕s using a real-time DPSK lasercom system with a hard-decision, Reed-Solomon (255,239) FEC code. 18 Leveraging more powerful 25% overhead block turbo codes with soft-decision decoding at 10 Gb∕s in a real-time DPSK system improved error-free sensitivity to 7-PPB. 19 Using offline DSP coherent receiver systems, recent demonstrations have made further sensitivity improvements.…”

Section: Introductionmentioning

confidence: 99%

Demonstration of a variable data-rate free-space optical communication architecture using efficient coherent techniques

et al. 2016

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Abstract. The next generation free-space optical (FSO) communications infrastructure will need to support a wide range of links from space-based terminals in low Earth orbit, geosynchronous Earth orbit, and deep space to the ground. Efficiently enabling such a diverse mission set requires an optical communications system architecture capable of providing excellent sensitivity (i.e., few photons-per-bit) while allowing reductions in data rate for increased system margin. Specifically, coherent optical transmission systems have excellent sensitivity and can trade data rate for system margin by adjusting the modulation format, the forward error correction (FEC) code rate, or by repeating blocks of channel symbols. These techniques can be implemented on a common set of hardware at a fixed system baud rate. Experimental results show that changing modulation formats between quaternary phase-shifted keying and binary phase-shifted keying enables a 3-dB scaling in data rate and a 3.5-dB scaling in system margin. Experimental results of QPSK transmission show a 5.6-dB scaling of data rate and an 8.9-dB scaling in system margin by varying the FEC code rate from rate-9∕10 to rate-1∕4. Experimental results also show a 45.6-dB scaling in data rate over a 41.7-dB range of input powers by block-repeating and combining a pseudorandom binary sequence up to 36,017 times. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Lightwave Systems

2010

Fiber‐Optic Communication Systems

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High-Sensitivity 40-Gb/s RZ-DPSK With Forward Error Correction

Cited by 33 publications

References 15 publications

Laser communication transmitter and receiver design

Laser communication transmitter and receiver design

Demonstration of a variable data-rate free-space optical communication architecture using efficient coherent techniques

Lightwave Systems

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