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Proceedings Paper

Optical RAM row access using WDM-enabled all-passive row/column decoders
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Paper Abstract

Towards achieving a functional RAM organization that reaps the advantages offered by optical technology, a complete set of optical peripheral modules, namely the Row (RD) and Column Decoder (CD) units, is required. In this perspective, we demonstrate an all-passive 2×4 optical RAM RD with row access operation and subsequent all-passive column decoding to control the access of WDM-formatted words in optical RAM rows. The 2×4 RD exploits a WDM-formatted 2-bit-long memory WordLine address along with its complementary value, all of them encoded on four different wavelengths and broadcasted to all RAM rows. The RD relies on an all-passive wavelength-selective filtering matrix (λ-matrix) that ensures a logical ‘0’ output only at the selected RAM row. Subsequently, the RD output of each row drives the respective SOA-MZI-based Row Access Gate (AG) to grant/block the entry of the incoming data words to the whole memory row. In case of a selected row, the data word exits the row AG and enters the respective CD that relies on an allpassive wavelength-selective Arrayed Waveguide Grating (AWG) for decoding the word bits into their individual columns. Both RD and CD procedures are carried out without requiring any active devices, assuming that the memory address and data word bits as well as their inverted values will be available in their optical form by the CPU interface. Proof-of-concept experimental verification exploiting cascaded pairs of AWGs as the λ-matrix is demonstrated at 10Gb/s, providing error-free operation with a peak power penalty lower than 0.2dB for all optical word channels.

Paper Details

Date Published: 7 March 2014
PDF: 6 pages
Proc. SPIE 8982, Optical Components and Materials XI, 89821R (7 March 2014); doi: 10.1117/12.2037879
Show Author Affiliations
Sotirios Papaioannou, Ctr. for Research and Technology Hellas (Greece)
Aristotle Univ. of Thessaloniki (Greece)
Theoni Alexoudi, Ctr. for Research and Technology Hellas (Greece)
Aristotle Univ. of Thessaloniki (Greece)
George T. Kanellos, Ctr. for Research and Technology Hellas (Greece)
Amalia Miliou, Ctr. for Research and Technology Hellas (Greece)
Aristotle Univ. of Thessaloniki (Greece)
Nikos Pleros, Ctr. for Research and Technology Hellas (Greece)
Aristotle Univ. of Thessaloniki (Greece)


Published in SPIE Proceedings Vol. 8982:
Optical Components and Materials XI
Michel J. F. Digonnet; Shibin Jiang, Editor(s)

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