.A novel OCDMA drop unit based on fiber gratings and 2D wavelength-time codes[J].Optoelectronics Letters,2005,1(1):53-56 A novel OCDMA drop unit based on fiber gratings and 2D wavelength-time codes CHEN Biao WANG Fu-chang HU Jian-dong HE Sai-ling [1]Center for Optical and Electromagnetic Research and Laboratory of Optical Communications , Zhejiang University, 31002？, China Abstract:       A novel drop unit for the optical code-division multiple access (OCDMA) based on fiber Bragg gratings and two-dimensional wavelength-time code is studied. The simple OCDMA drop unit can drop a code channel without disturbing the rest code channels. A similar unit for dropping a group of code channels is also proposed. Numerical simulation is given. The system delay can decrease by substituting the electrieal driving optical switch with a specific optical driving. The single channel drop unit can also be the basis for multiple channels drop. Supported by National Hi-tech 863 project (No. 2002 AA 311141) Hits: 3472 Download times: 185 View Full Text    Download reader