Fibre Bragg grating based spectral encoder/decoder for lightwave CDMA

Grunnet‐Jepsen, A.; Johnson, Alan W.; Maniloff, Eric S.; Mossberg, T. W.; Munroe, M.; Sweetser, John N.

doi:10.1049/el:19990722

Cited by 71 publications

(21 citation statements)

References 5 publications

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“…OOK signal is then spectrally encoded in time (optional) and frequency domains at the encoder. The encoder can be implemented using the well-studied fiber brag gratings (FBGs) structure [14], [15]. When the OOK signal is input into the encoder, some of its frequencies can pass through while others cannot.…”

Section: System Descriptionsmentioning

confidence: 99%

FWM impairment in multi-wavelength optical code-division multiplexing systems

Dang

Pham

2009

2009 Australasian Telecommunication Networks and Applications Conference (ATNAC)

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This paper comprehensively analyzes the impact of four wave mixing (FWM) on the performance of multiwavelength optical code-division multiplexing (MW-OCDM) systems. The impact of FWM on various aspects of MW-OCDM system performance, including bit error rate (BER), the number of users, and power penalty, is quantitatively discussed with several types of optical fibers such as single mode fiber (SMF), dispersionshifted fiber (DSF), and non-zero DSF considering different frequency spacings. We find that the operational range of optical power is strictly limited under the impact of FMW. For example, it is about 6 dB in the case of spectral amplitude encoding OCDM systems using MQC code (132, 12, 1) and SMF. Also, the impact of FWM can be relieved so as to extend the operational power range by using two dimensional (2-D) codes (especially when different time-spreading patterns are used) or increasing the frequency spacing.

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Section: System Descriptionsmentioning

confidence: 99%

FWM impairment in multi-wavelength optical code-division multiplexing systems

Dang

Pham

2009

2009 Australasian Telecommunication Networks and Applications Conference (ATNAC)

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“…5 shows a schematic diagram of a 2.5 Gbps OCDMA system using the realized spectral phase en/decoders. Unlike the configuration depicted in reference [14] where en/decoders need two chirped FBG, our proposed system contains one chirped FBG with phase shifts as encoder and/or decoder in order to simplify the en/decoder devices and to reach a better optical power budget. A mode-locked fiber laser (MLL) running at a repetition rate of 10-GHz delivers 1.3 ps sech pulses which are first amplified up to an average power of 30 dBm by an EDFA amplifier.…”

Section: En/decoder Photo-writing With Travelling Interference Fmentioning

confidence: 99%

Spectral phase OCDMA encoder/decoder using travelling interference fringe photo-writing technique

et al. 2009

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In this paper, we describe and investigate a new UV photo-writing setup using Travelling Interference Fringe (TIF) technique for Fiber Bragg Grating (FBG) realization. A continuously moving fringe pattern is generated using two electro-optical UV modulators and is synchronized with the fiber moving speed. FBG parameters such as chirp, phase shift and apodization profile can be controlled with high precision. This method is used to realize repeatable, flexible and complex profile spectral phase OCDMA encoders/decoders. Experimental realization results in good agreement with numerical simulations are presented and discussed. The obtained encoders/decoders are tested within a system setup using a supercontinuum optical source.

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“…The use of FBGs for encoding and decoding of WH/TS optical codes in OCDMA systems by spreading multiple wavelengths within a bit period and placing them into time chips at the transmitter end and reciprocally de-spreading them and forming an autocorrelation peak at the receiver end is a widely known technique [12], [13]. However, once signal is encoded and OCDMA code had been generated by the FBG encoder, the individual wavelengths of the WH/TS OCDMA code cannot be any more easily individually accessed for a selective processing if that is what is desired.…”

Section: Introductionmentioning

confidence: 99%

$In~Situ$ Method for Power Re-Equalization of Wavelength Pulses Inside of OCDMA Codes

Osadola

Idris

Glesk

et al. 2011

IEEE J. Quantum Electron.

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Abstract-A simple in-situ method to equalize power among individual wavelengths pulses representing two-dimensional wavelength-hopping time-spreading OCDMA code originally generated by a fibre Bragg grating-based OCDMA encoder is presented. Experimental data obtained in a field-based multiuser OCDMA testbed shows that applying this method results in system performance enhancements which was demonstrated by observing improved bit error rate (BER) during the field trials.

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Fibre Bragg grating based spectral encoder/decoder for lightwave CDMA

Cited by 71 publications

References 5 publications

FWM impairment in multi-wavelength optical code-division multiplexing systems

FWM impairment in multi-wavelength optical code-division multiplexing systems

Spectral phase OCDMA encoder/decoder using travelling interference fringe photo-writing technique

$In~Situ$ Method for Power Re-Equalization of Wavelength Pulses Inside of OCDMA Codes

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