To improve the physical-layer data confidentiality in short-reach optical networks, we have proposed an M-ary blockciphered system using an optical code multiplexing approach. In a previous system, each optical code (OC), that corresponds to a frequency subcarrier, was mapped onto one of the log2M bits, and the computational security is related to the correspondence between the bit-block and the OC, and the number of possible combinations equates M!. However, this system presents two critical issues (1) Computational Security: the number M of OCs that can be generated by an optical arrayed waveguide grating (AWG) is limited, due to the port number and the subcarrier crosstalk. (2) Physical security: a careful differential analysis of the corresponding time waveform, optical power, and/or optical spectrum can be used to identify the symbol pattern.
To mitigate the effects of interchannel interference, we propose a new differential phase-shift keying (DPSK)-based multi-dimensional M-ary block ciphering system, that assigns binary phase difference patterns to adjacent symbols and demonstrate a 16-dimensional 216-ary ciphered system. In addition, to increase the M-ary number, without increasing the number of OCs, we consider also a differential quadrature phase-shift keying (DQPSK)-based multi-dimensional M-ary block ciphered system and demonstrate a 16-dimensional 232-ary ciphered system.
We describe a novel all-optical hybrid mode-division multiplexing (MDM) -optical code division multiplexing (OCDM) architecture for future flexible access network. We successfully demonstrate, for the first time, an asynchronous on-off keying (OOK) modulation, 2 mode x 4 code x 10 Gbps transmission over 2km two mode fiber (TMF), without dispersion compensation at single wavelength, by using 16-chip (200 Gchip/s), 16-phase-shift keyed (PSK) optical codes (OC) generated by a multiport encoder/decoder (E/D) and an optical mode multiplexer/demultiplexer (MMUX/MDeMUX). We also analytically and experimentally evaluate the mode crosstalk tolerance as a function of the LP01 and LP11 modes.
Conference Committee Involvement (3)
Next-Generation Optical Communication: Components, Sub-Systems, and Systems VI
31 January 2017 | San Francisco, California, United States
Next-Generation Optical Communication: Components, Sub-Systems, and Systems V
16 February 2016 | San Francisco, California, United States
Next-Generation Optical Communication: Components, Sub-Systems, and Systems IV
10 February 2015 | San Francisco, California, United States
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