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We experimentally demonstrate a record -ary optical code division multiplexing (OCDM) system at 2.5 Gbps using multidimensional phase shift keying (PSK) codes generated/processed by a single multiport optical encoder/decoder (E/D). To analyze the system performance, we evaluate the power margin and the data confidentiality. For application to access networks, we propose...
A record 4096 (= 16 × 16 × 16)-ary OCDM system at 2.5Gbps using multidimensional phase shift keying (PSK) codes with a single multi-port optical encoder/decoder has been demonstrated for the first time. An accurate model evaluates the power margins.
A next generation passive optical network (NG-PON) becomes necessary to upgrade the systems, providing a larger dedicated bandwidth to each user. In this paper, we review our research activities carried out during the past five years over OCDMA system and its related technologies.
We experimentally demonstrate the security improvement using ±π/2-phase-shifted SSFBG encoder in time-spreading OCDMA. Compared with conventional 0/π-phase-shifted SSFBG encoder, ±π/2-phase-shifted SSFBG encoder conceals code pattern well in the encoded waveform. We also investigate the influence of input pulse and the experimental measurement matches the calculated result very well.
1.25 Gbps time domain spectral phase encoded OCDMA signal with 32-chip, 40 Gchip/s optical codes has been stealthily transmitted over public 10 Gbps WDM channel. Error-free transmission has been achieved for both the public and stealth channels.
We develop a novel apodized, 16-level-phase-shifted SSFBG optical encoder/decoder, which can improve the system performance of OCDMA system. Error free (BERLt10-12) transmissions of 8-user, 10 Gbps, DPSK-OCDMA over 50 km are successfully demonstrated.
Secure 2.5 Gbps, 256-ary polarization-multiplexed optical code division multiplexing (OCDM) transmission using a single multi-port optical en/decoder is experimentally demonstrated for the first time.
Full-duplex, asynchronous, 10Gbps DPSK-OCDMA system on same wavelength using hybrid multi-port and SSFBG en/decoder is experimentally demonstrated. Error-free (BER<10-9) transmissions for all channels of both up- (4-user) and down- (8-user) link are obtained.
Secure 2.5 Gbit/s, 16-ary optical code division multiplexing (OCDM)-based block-ciphering with on-line XOR using a single multi-port optical en/decoder and its 50 km-long fiber transmission with true clock recovery is experimentally demonstrated for the first time.
We demonstrate the reconfigurable time domain spectral phase encoding/decoding (SPED) schemes using fibre Bragg gratings (FBG) for the first time. Chirped FBG is used for coherent spectral phase encoded OCDMA. FBG array with two-dimensional optical code patterns is used for two-dimensional coherent OCDMA.
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