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

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...

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Bibliographic Details
Published in:Journal of lightwave technology 2001-09, Vol.19 (9), p.1352-1365
Main Authors: Peh Chiong Teh, Petropoulos, P., Ibsen, M., Richardson, D.J.
Format: Article
Language:English
Subjects:
All optical circuits
Applied sciences
Bragg gratings
Circuit properties
Code Division Multiple Access
Coding
Comparative studies
Decoding
Diffraction gratings
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Fibers
Flexibility
Gratings
Multiaccess communication
Optical and optoelectronic circuits
Optical data processing
Optical devices
Optical fiber networks
Optical fibers
Optical filters
Optical refraction
Optical signal processing
Optical solitons
Optical variables control
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Summary: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 M-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 /spl sim/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.
ISSN:0733-8724
1558-2213
DOI:10.1109/50.948283