We propose and demonstrate experimentally an all-optical packet routing scheme using hybrid-wavelength-divisionmultiplexing/optical-code-division multiple access labeling for 40-Gb/s nonreturn-to-zero (NRZ) data. Wit...
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We propose and demonstrate experimentally an all-optical packet routing scheme using hybrid-wavelength-divisionmultiplexing/optical-code-division multiple access labeling for 40-Gb/s nonreturn-to-zero (NRZ) data. With no electronic control, the system forwards asynchronously packets delimited by valid label and suppresses unwanted traffic. It consists of an optical flip-flop controlled by two correlators combined with a Mach-Zehnder interferometer that selects packets for each fiber output. The experimental results show optical switching operation for the optical-code gate with an extinction ratio of 16 dB between the switched and unswitched packets and a switching time below 2 ns. Error-free operation has been successfully achieved with low-power penalty for 40-Gb/s NRZ data.
We propose and experimentally demonstrate a transparent optical-code-divisionmultiplexing (OCDM) overlay public dense wavelength-divisionmultiplexing (DWDM) network architecture enabled by a passive spectral notch f...
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We propose and experimentally demonstrate a transparent optical-code-divisionmultiplexing (OCDM) overlay public dense wavelength-divisionmultiplexing (DWDM) network architecture enabled by a passive spectral notch filter for extracting and detecting a secure OCDM signal, which employs a time domain spectral phase encoding/decoding scheme that can simultaneously generate differential-phase-shift-keying (DPSK) data and opticalcode patterns using only a single phase modulator. The time domain encoded OCDM signal has been scrambled bit-by-bit by a prime hopping pattern and concealed in the public DWDM channels to significantly improve the OCDM channel security. The effect of opticalcode patterns, the channel number, and bandwidth of the spectral notch filters on the system performance has been theoretically simulated and experimentally validated. In the experiment, error-free transmission of a 2.5-Gb/s time domain spectral phase encoded DPSK-OCDM signal with three 8-chip, 20-Gchip/s opticalcodes and a scrambled code pattern in the transparent OCDM overlay two-channel 10-Gb/s DWDM network has been successfully demonstrated.
Several constructions of two-dimensional (2-D) codes have been proposed to overcome the drawbacks of nonlinear effects in large spread sequences of one-dimensional (1-D) unipolar codes in fiber-optic code-division mul...
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Several constructions of two-dimensional (2-D) codes have been proposed to overcome the drawbacks of nonlinear effects in large spread sequences of one-dimensional (1-D) unipolar codes in fiber-optic code-divisionmultiple-access (FO-CDMA) networks. Wavelength-time (W/T) encoding of the 2-D codes is practical in FO-CDMA networks. W/T codes reported so far can be classified mainly into two types: 1) hybrid codes, where one type of sequence is crossed with another to improve the cardinality and correlation properties and 2) conversion of 1-D sequences to 2-D codes to reduce the "timelike" property. This paper describes the basic principles of a new family of wavelength/time multiple-pulses-per-row (W/T MPR) codes, for incoherent FO-CDMA networks, which have good cardinality, spectral efficiency, and minimal cross correlation values. In addition, an expression for the upper bound on the cardinality of W/T MPR codes is derived. Another feature of the W/T MPR codes is that the aspect ratio can be varied by a tradeoff between wavelength and temporal lengths. The correlation properties of W/T MPR codes are verified by simulation using Matlab. For given wavelength x time dimensions, various W/T codes, whose cardinalities are known, are compared, and it is shown that the W/T MPR family of codes have better cardinality and spectral efficiency than the other W/T codes. Performance analysis of the W/T MPR codes and their limiting cases is carried out for various parameter variations such as the dimensions of wavelength, time, and weight of the code.
A novel optical interconnect architecture based on temporally accessed spectral multiplexing (TASM(TM)) technology is presented. The use of TASM optical interconnects will be demonstrated in multipleaccess telecommun...
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ISBN:
(纸本)0819431028
A novel optical interconnect architecture based on temporally accessed spectral multiplexing (TASM(TM)) technology is presented. The use of TASM optical interconnects will be demonstrated in multipleaccess telecommunication applications. TASM technology builds on opticalcode-divisionmultipleaccess (O-CDMA) concepts with promise of low cost implementation of Terabit/second optical networks. The use of TASM technology to enhance wavelength divisionmultiplexing (WDM) in optical communication systems will be discussed. The working principle and design of TASM system architectures will be presented with emphasis on the key functional component - the TASM encoder.
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