Results 11 to 20 of about 18,013 (228)
50-Gb/s silicon quadrature phase-shift keying modulator
Optics Express, 2012 We report the first successful demonstration of quadrature phase-shift keying (QPSK) modulation using two nested silicon Mach-Zehnder modulators. 50-Gb/s QPSK signal is generated with only 2.7-dB optical signal-to-noise ratio penalties from the theoretical limit at a bit-error ratio of 10(-3).
Po, Dong +4 more
openaire +4 more sources
Quadrature phase shift keying coherent state discrimination via a hybrid receiver [PDF]
New Journal of Physics, 2012 We propose and experimentally demonstrate a near-optimal discrimination scheme for the quadrature phase shift keying (QPSK) protocol. We show in theory that the performance of our hybrid scheme is superior to the standard scheme—heterodyne detection—for ...
C R Müller +6 more
doaj +4 more sources
Short-range ultrasonic communications in air using quadrature modulation [PDF]
, 2009 A study has been undertaken of ultrasonic communications methods in air, using a quadrature modulation method. Simulations were first performed to establish the likely performance of quadrature phase shift keying over the limited bandwidth available in ...
Green, Roger, Hutchins, David A., Li, C.
core +1 more source
Quadrature demultiplexing using a degenerate vector parametric amplifier [PDF]
, 2014 We report on quadrature demultiplexing of a quadrature phase-shift keying (QPSK) signal into two cross-polarized binary phase-shift keying (BPSK) signals with negligible penalty at bit-error rate (BER) equal to 10−9.
Andrekson, Peter +8 more
core +1 more source
Rotative quadrature phase-shift keying
Electronics Letters, 1992 A rotative quadrature phase-shift keying (RQPSK) modulation scheme is proposed. By rotating the QPSK signal constellation by pi/2, either clockwise or anticlockwise, during a symbol duration, the conventional QPSK scheme can be modified to transmit 3 bits per symbol to achieve both power and bandwidth efficiency.
J. Liu +3 more
openaire +1 more source
DAC-Less amplifier-less generation and transmission of QAM signals using sub-volt silicon-organic hybrid modulators [PDF]
, 2015 We demonstrate generation and transmission of optical signals by directly interfacing highly efficient silicon-organic hybrid (SOH) modulators to binary output ports of a field-programmable gate array. Using an SOH Mach-Zehnder modulator (MZM) and an SOH
Bogaerts, Wim +10 more
core +3 more sources
Quadrature‐carrier amplitude phase shift keying
IET Communications, 2019 Amplitude phase shift keying (APSK) is the emerging modulation scheme used in deep satellite communications and known to have a high spectral and energy efficiency among other two‐dimensional (2‐D) M‐ary schemes.
Abdulkerim Öztekin, Ergun Erçelebi
openaire +1 more source
Nonlinear Silicon Photonic Signal Processing Devices for Future Optical Networks
Applied Sciences, 2017 In this paper, we present a review on silicon-based nonlinear devices for all optical nonlinear processing of complex telecommunication signals. We discuss some recent developments achieved by our research group, through extensive collaborations with ...
Cosimo Lacava +2 more
doaj +1 more source
Phase Jitter in MPSK Carrier Tracking Loops: Analytical, Simulation and Laboratory Results [PDF]
, 1997 A performance characteristic of M-ary phase shift keying (MPSK) receivers is the variance of the phase error between the received and recovered signal carriers. For binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK) loops utilizing
Kopp, Brian T., Osborne, William P.
core +2 more sources
Reconfigurable Photonic Generation of Binary Modulated Microwave Signals
IEEE Photonics Journal, 2020 A novel photonic scheme of binary modulated microwave signals generation based on a dual-polarization quadrature phase-shift keying (DP-QPSK) modulator is proposed and experimentally demonstrated.
Jialin Ma +4 more
doaj +1 more source