搜索结果: 61-75 共查到“光学工程 Modulation”相关记录144条 . 查询时间(0.054 秒)
Secure Optical Communication Using Single Phase Modulator for Bit-by-bit Code Scrambling and DPSK Data Modulation
Fiber optics communications Optical security and encryption Phase modulation
2010/6/9
We proposed a novel bit-by-bit code-hopping scheme using single phase modulator for secure optical communication and experimentally demonstrated the transmission of 2.5Gbps DPSK data secured by scramb...
Phase to Intensity Modulation Conversion by Third-Order Dispersion and Its Effect on Group Velocity Dispersion Measurement Using Phase-Modulated CW Light
Dispersion Phase modulation
2010/6/9
We show that phase to intensity modulation conversion induced by third-order dispersion doubles the modulation frequency, and therefore, the third-order dispersion does not affect group velocity dispe...
Security Enhanced SPECTS O-CDMA with Four-State Encoded Data Modulation
Networks Optical security encryption.
2010/6/9
We demonstrate a security enhancement mechanism based on four-state temporal optical coding which protects a SPECTS O-CDMA upstream link against eavesdropping including DPSK detection. The FPGA-based ...
Demonstration of Multi-Rate Thresholded Preamplified 16-ary Pulse-Position-Modulation
Optical communications Free-space optical communication
2010/6/9
Sensitive multi-rate optical communication is experimentally investigated on static and fading channels at data rates from 52 Mbps to 311 Mbps using 16-ary pulse-position-modulation,channel coding and...
Investigation of Spectral Efficient Modulation Formats for 400Gbit/s/port Optical Packet Switched System
Switching Packet Optical communications
2010/6/8
We investigate the performance of NRZ-OOK, NRZ-DPSK, NRZ-DQPSK, NRZ-8PSK and NRZ-16-QAM modulation and their influence to an optical packet switched systems (OPS) performance.The aim was to demonstrat...
Quadrature Duobinary Modulation for 100G Transmission Beyond the Nyquist Limit
Fiber optics communications Coherent communications
2010/6/8
Quadrature duobinary (QDB) modulation with coherent detection is proposed for 112-Gb/s transmission systems. With proper system design for maximum spectral efficiency, we show that dual polarization Q...
230 Mbit/s via a Wireless Visible-Light Link based on OOK Modulation of Phosphorescent White LEDs
Free-space optical communication Light-emitting diodes
2010/6/8
We report a first indoor wireless visible-light link operating up to 230 Mbit/s by use of on-off-keying and with bit-error-ratios below 2·10 -3 . The results were achieved for illuminance levels recom...
12.5-Gb/s Wireless Data Transmission by Using Bias Modulation of NBUTC-PD Based W-Band Photonic Transmitter-Mixer
Photodiodes Modulators
2010/6/8
We demonstrated near-ballistic uni-traveling-carrier photodiode based broadband photonic transmitter-mixers with quasi-Yagi radiators fed horn antennas. 100GHz wireless transmission with date rate as ...
Transmission of 5x62 Gbit/s DWDM Coherent OFDM with a Spectral Efficiency of 7.2 Bit/s/Hz using Joint 64-QAM and 16-QAM Modulation
Modulation Coherent communications
2010/6/8
Transmission of 5x62 Gbit/s polarization multiplexed coherent OFDM is demonstrated over 80 km SSMF. Using 64-QAM and 16-QAM simultaneously allows reducing the channel spacing and makes a net spectral ...
Transmission of 44-Gb/s Coherent Optical OFDM Signal with Trellis-Coded 32-QAM Subcarrier Modulation
Coherent communications Fiber optics communication
2010/6/8
We experimentally demonstrate the transmission of a spectrally-efficient 44-Gb/s CO-OFDM signal whose subcarriers are trellis-coded with 32-QAM over a 990-km dispersion-managed SSMF link, and show the...
Spectral-efficient OOFDM system using compatible SSB modulation with a simple dual-electrode MZM
Frequency modulation Fiber optics optical communications
2010/6/8
A direct-detection OOFDM transmission is experimentally demonstrated which does not need a guard-band between the carrier and the OFDM sideband. The compatible-SSB modulation is realized through a sin...
Reconfigurable Functionalities of Coupled-Cavity VCSELs Using Digital Modulation
Semiconductor Lasers Vertical Cavity Surface Emitting Lasers
2010/6/5
The coupled-cavity VCSEL under digital modulation can be configured to perform different functionalities for data communications. 10 Gb/s pulse amplitude modulation up to 4 levels, and 34 ps optical p...
25 Gb/s Direct Modulation of Implant-Confined Holey VCSELs
Semiconductor Lasers Vertical Cavity Surface Emitting Lasers
2010/6/5
25 Gb/s direct modulation and bit error measurements over 100m multimode fiber from an 850-nm implant-confined holey VCSEL are demonstrated. The high speed performance arises from cavity designs that ...
Vector Signal Transmission in Radio-Over-Fiber Link Employing Optical Multi-Sidebands Modulation Scheme
Fiber optics communications Radio frequency photonics
2010/6/5
We propose theoretically and experimentally demonstrate a radio-over-fiber link employing optical multi-sidebands modulation to transmit vector signals, with the advantages of overcoming dispersion-in...
M-PSK Versatile Modulation using a Single-electrode Straight-line Phase Modulator and Digital Signal Processing for ISI-suppression
Coherent communications Fiber optics communications
2010/6/5
BPSK, QPSK, and 8-PSK modulation/demodulation was experimentally demonstrated using only a single-electrode straight-line phase modulator for the first time. ISI caused by the modulation was compensat...