Prechirp in NRZ-based 40-Gb/s single-channel and WDM transmission systems

Hodzic, A.; Konrad, B.; Petermann, K.

doi:10.1109/68.980479

Cited by 12 publications

(5 citation statements)

References 8 publications

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“…The last step in iteration is to compute the updated likelihood ratios according to (5) Decoding halts when a valid codeword or a maximum number of iteration has been reached. Steps (4) and (5) can be viewed as propagation of likelihoods (beliefs) in a code bipartite graph [13], [17].…”

Section: Belief Propagation Algorithmmentioning

confidence: 99%

Low-density parity check codes and iterative decoding for long-haul optical communication systems

Vasić

Djordjević

Kostuk

2003

J. Lightwave Technol.

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A forward-error correction)FEC) scheme based on low-density parity check (LDPC) codes and iterative decoding using belief propagation in code graphs is presented in this paper. We show that LDPC codes provide a significant system performance improvement with respect to the state-of-the-art FEC schemes employed in optical communications systems. We present a class of structured codes based on mutually orthogonal Latin rectangles. Such codes have high rates and can lend themselves to very low-complexity encoder/decoder implementations. The system performance is further improved by a code design that eliminates short cycles in a graph employed in iterative decoding. Index Terms-Balanced incomplete block designs (BIBDs), belief propagation algorithm, forward-error correction (FEC), long-haul transmission, low-density parity check(LDPC) codes, optical communications.

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Section: Belief Propagation Algorithmmentioning

confidence: 99%

Low-density parity check codes and iterative decoding for long-haul optical communication systems

Vasić

Djordjević

Kostuk

2003

J. Lightwave Technol.

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“…In DWDM, several closely spaced channels are multiplexed in the wavelength domain to increase the system throughput [1]. A lot of effort has been devoted in the past to the study of WDM systems [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Since the chromatic dispersion and the optical nonlinear effects in fibers are the main limiting factors for realizing a WDM system, it is important to choose an optimal dispersion compensation scheme and a suitable modulation format [2,[4][5][6]. Two commonly used modulation formats are return-to-zero (RZ) and nonreturn-to-zero (NRZ).…”

Section: Introductionmentioning

confidence: 99%

“…An improved understanding of the WDM system design has been attained by the comparison between these two modulation formats under different conditions [2,4]. An alternate-chirped nonreturn-to-zero (AC-NRZ) format has been suggested by Hodzic et al for improving the performance of 40 Gb/s/channel WDM system [6]. A variation of RZ modulation format known as carrier-suppressed return-to-zero (CS-RZ) has also been suggested [9].…”

Section: Introductionmentioning

confidence: 99%

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Performance evaluation of a multi-wavelength gigahertz optical source for wavelength division multiplexed transmission

Dixit

Vijaya

2004

Optics Communications

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“…The main challenges to be overcome for such systems include: dispersion, dispersion slope, polarization mode dispersion, increased sensitivity due to fiber nonlinearities, etc. A number of novel modulation schemes, novel dispersion maps and novel fibers have been reported recently in order to achieve these goals [5][6]. All Raman amplifiers or hybrid Raman/erbium-doped fiber amplifiers are also promising technologies for future applications [4].…”

Section: Introductionmentioning

confidence: 99%