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The recent research results on the applications of optical code based technology for access and secure optical communication is reviewed in this paper.
In this paper, we review the advances of using bit-by-bit optical code scrambling and rapid reconfigurable/code-length-variable code shifting technologies for security improvement in optical communication system.
We experimentally demonstrate an ultrafast optical pulse repetition rate multiplication technique based on reconfigurable time domain spectral amplitude/phase filtering operation provided by only a dispersive fiber and electro-optical modulator driven by a 40GHz pulse pattern generator, which can be programmed to control the repetition rate.
We report a reconfigurable 2D (temporal-spectral) coherent OCDMA system using Fiber Bragg Gratings for generating wavelength hopping pattern and single phase modulator for simultaneous time domain spectral phase encoding/DPSK data modulation.
A novel bit-by-bit code hopping scheme using single phase modulator is proposed and demonstrated for secure optical communication application. In the experiment, 2.5 Gbit/s DPSK data has been generated and securely transmitted over 34 km by scrambling five 8-chip, 20 Gchip/s Gold codes with prime-hop patterns.
A novel scheme using single phase modulator for simultaneous generating and decoding of time domain spectral phase encoded signal and DPSK data modulation is proposed and experimentally demonstrated for five 16-chip, 40GHz/chip optical code patterns.
We proposed a novel bit-by-bit code-hopping scheme using single phase modulator for secure optical communication and experimentally demonstrated the transmission of 2.5 Gbps DPSK data secured by scrambling five 8-chip, 20 Gchip/s Gold codes with prime-hop patterns.
We proposed and experimentally demonstrated time-domain spectral phase encoding scheme using single phase modulator for 8-chip, 20 GHz/chip optical code generation and 2.5 Gbps DPSK data modulation, and successfully transmitted and decoded the data with BER<10-9.
We proposed and demonstrated a novel time domain spectral phase encoding/decoding scheme by time domain stretching and high speed phase modulating short optical pulses. 16 chips, 40 GHz/chip optical codes have been generated and recognized successfully using long chirped fibre Bragg grating (LCFBG) as dispersive components, respectively. Transmission experiments have been carried out successfully...
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