Multi-wavelength access gate for WDM-formatted words in optical RAM row architectures

D. Fitsios, T. Alexoudi, C. Vagionas, A. Miliou, G. T. Kanellos, N. Pleros

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

8 Citations (Scopus)


Optical RAM has emerged as a promising solution for overcoming the "Memory Wall" of electronics, indicating the use of light in RAM architectures as the approach towards enabling ps-regime memory access times. Taking a step further towards exploiting the unique wavelength properties of optical signals, we reveal new architectural perspectives in optical RAM structures by introducing WDM principles in the storage area. To this end, we demonstrate a novel SOA-based multi-wavelength Access Gate for utilization in a 4x4 WDM optical RAM bank architecture. The proposed multiwavelength Access Gate can simultaneously control random access to a 4-bit optical word, exploiting Cross-Gain-Modulation (XGM) to process 8 Bit and Bit channels encoded in 8 different wavelengths. It also suggests simpler optical RAM row architectures, allowing for the effective sharing of one multi-wavelength Access Gate for each row, substituting the eight AGs in the case of conventional optical RAM architectures. The scheme is shown to support 10Gbit/s operation for the incoming 4-bit data streams, with a power consumption of 15mW/Gbit/s. All 8 wavelength channels demonstrate error-free operation with a power penalty lower than 3 dB for all channels, compared to Back-to-Back measurements. The proposed optical RAM architecture reveals that exploiting the WDM capabilities of optical components can lead to RAM bank implementations with smarter column/row encoders/decoders, increased circuit simplicity, reduced number of active elements and associated power consumption. Moreover, exploitation of the wavelength entity can release significant potential towards reconfigurable optical cache mapping schemes when using the wavelength dimension for memory addressing.

Original languageEnglish
Title of host publicationOptical Components and Materials X
Publication statusPublished - 29 May 2013
EventOptical Components and Materials X - San Francisco, CA, United States
Duration: 5 Feb 20136 Feb 2013


ConferenceOptical Components and Materials X
Country/TerritoryUnited States
CitySan Francisco, CA


  • Cross-Gain Modulation
  • Optical Access Gate
  • Optical amplifiers
  • Optical memories
  • Semiconductor optical amplifiers


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