Optical implementation of bipolar codes

Dennis, Tasshi; Young, James F.

doi:10.1109/3.748832

Cited by 14 publications

(8 citation statements)

References 5 publications

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“…The SNR PIIN results of the proposed hybrid SPC-SAC scheme are found to be approximately 6 and 3 dB better than those of the conventional complementary unipolar scheme and the previous SPC scheme, respectively. As expected, the spectral efficiency is twice that of the previous unipolar supercode scheme 8,9 based on Walsh-Hadamard code.…”

Section: Evaluation Of the Signal-to-piin Ratiosupporting

confidence: 80%

“…Since only the central spectrum of the incoherent source was usefully flat, the bit error rate ͑BER͒ performance and spectral efficiency of supercode configured by Dennis et al 8,9 was severely degraded due to the resulting occupation of a double spectral bandwidth. To improve the spectral efficiency and overcome the PIIN problem, the current authors configured a complementary bipolar spectral amplitude coding ͑SPC͒ scheme.…”

Section: Introductionmentioning

confidence: 99%

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Improved phase noise performance using orthogonal ternary codes over spectral polarization and amplitude coding networks

Huang

Chang

2007

Opt. Eng

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This study proposes an improved hybrid scheme of spectral polarization coding ͑SPC͒ and spectral amplitude coding ͑SAC͒ based on a specified orthogonal ternary sequence. In a previous SPC scheme, the entire wavelength was assigned either a vertical or a horizontal state of polarization. However, this study assigns positive, negative, or null chip values to individual wavelengths to create an orthogonal ternary sequence based on the bipolar Walsh-Hadamard matrix. This approach reduces the number of wavelength collisions at the photodetector and hence reduces the phase-induced intensity noise ͑PIIN͒. Neglecting the effects of shot noise and thermal noise, we consider only PIIN with a degree of polarization P = 0. The proposed scheme improves the bit error rate by 40% and 100% over SPC and complementary unipolar SAC schemes. The number of simultaneous active users supported by the hybrid scheme for the worst case ͑P =1͒ is improved by 41.3% over the complementary unipolar SAC coding scheme for the ideal case ͑P =0͒.

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Section: Evaluation Of the Signal-to-piin Ratiosupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Improved phase noise performance using orthogonal ternary codes over spectral polarization and amplitude coding networks

Huang

Chang

2007

Opt. Eng

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“…In a WPDM system, each bit from each user is waveformcoded by wavelet atom functions, and all the data streams from the users are transmitted simultaneously. On the other hand, in a code-based O-CDMA system, a different code is assigned to each user; therefore, if we remove the pulse shapers in the transmission scheme of Figure 8, we obtain a standard O-CDMA system, where the input data signals are coded by optical orthogonal codes (OOCs) sequences [30]. In fact, the device of Figure 4 is a full optical E/D that codes/decodes binary sequences from 2 users simultaneously [31,32]; of course, for an O-CDMA system, it is δt < ∆τ.…”

Section: Optical Wavelet Packet Division Multiplexingmentioning

confidence: 99%

Optical Wavelet Signals Processing and Multiplexing

Cincotti

Moreolo

Neri

2005

EURASIP J. Adv. Signal Process.

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We present compact integrable architectures to perform the discrete wavelet transform (DWT) and the wavelet packet (WP) decomposition of an optical digital signal, and we show that the combined use of planar lightwave circuits (PLC) technology and multiresolution analysis (MRA) can add flexibility to current multiple access optical networks. We furnish the design guidelines to synthesize wavelet filters as two-port lattice-form planar devices, and we give some examples of optical signal denoising and compression/decompression techniques in the wavelet domain. Finally, we present a fully optical wavelet packet division multiplexing (WPDM) scheme where data signals are waveform-coded onto wavelet atom functions for transmission, and numerically evaluate its performances

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“…The standard approach is to employ a bulk grating pair to spatially separate, and then recombine, the individual frequency components of a short pulse. A spatial amplitude-phase mask can then be used to perform the necessary filtering functions and to reshape the pulse [5]- [7]. However, the approach is again of somewhat limited practical value due not least to lack of compactness, spectral/temporal resolution, and cost.…”

Section: Fig 2 Schematic Examples Of Temporal Codes (Upper Traces) mentioning

confidence: 99%

A comparative study of the performance of seven- and 63-chip optical code-division multiple-access encoders and decoders based on superstructured fiber Bragg gratings

Teh

Petropoulos

Ibsen

et al. 2001

J. Lightwave Technol.

161

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Abstract-We report a range of elementary optical coding and decoding experiments employing superstructured fiber Bragg grating (SSFBG) components. First, we perform a comparative study of the relative merits of bipolar and unipolar coding : decoding schemes and show that the SSFBG approach allows high-quality unipolar and bipolar coding. A performance close to that theoretically predicted for seven-chip, 160-Gchip/s -sequence codes is obtained. Second, we report the fabrication and performance of 63-chip, 160-Gchip/s, bipolar Gold sequence grating pairs. These codes are at least eight times longer than those generated by any other scheme based on fiber grating technology so far reported. Last, we describe a range of transmission system experiments for both the seven-and 63-bit bipolar grating pairs. Error-free performance is obtained over transmission distances of 25 km of standard fiber. In addition, we have demonstrated error-free performance under multiuser operation (two simultaneous users). Our results highlight the precision and flexibility of our particular grating writing process and show that SSFBG technology represents a promising technology not just for optical code division multiple access (OCDMA) but also for an extended range of other pulse-shaping optical processing applications.Index Terms-All-optical process, code division multiple access (CDMA), communication systems, fiber Bragg gratings (FBGs), multiple-access communications, optical networks, optical signal processing.

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Optical implementation of bipolar codes

Cited by 14 publications

References 5 publications

Improved phase noise performance using orthogonal ternary codes over spectral polarization and amplitude coding networks

Improved phase noise performance using orthogonal ternary codes over spectral polarization and amplitude coding networks

Optical Wavelet Signals Processing and Multiplexing

A comparative study of the performance of seven- and 63-chip optical code-division multiple-access encoders and decoders based on superstructured fiber Bragg gratings

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