A suboptimal iterative demodulation and decoding receiver is presented for an LDPC coded spatial multiplexing OFDMA system. The proposed receiver is based on spatial demultiplexing at the first iteration and the interference cancellation with soft decoding outputs at the following iterations. It is shown that the proposed receiver can reduce the complexity of the optimal iterative demodulation ...

The techniques to implement radio over fiber (RoF) systems using optical subcarrier modulation (SCM) and dense wavelength division multiplexing (DWDM) are reviewed, which include the techniques of SCM, millimeter-wave (mm-wave) generation and reception at base stations, and optical multiplexing/demultiplexing. The impact of system nonlinear distortions and their suppression are also reviewed. I...

In a previous paper [M. Tsang, Phys. Rev. A 99, 012305 (2019)], I proposed quantum limit to the estimation of object moments in subdiffraction incoherent optical imaging. this sequel, prove rigorously by infinite-dimensional analysis. key proof is choice an unfavorable parametric submodel give bound for semiparametric problem. By generalizing larger class moments, also that measurement method s...

We numerically analyze the effectiveness of a nonlinear optical loop mirror (NOLM) based on standard communication fiber with randomly varying birefringence for demultiplexing streams of picosecond pulses at 100 GHz. A broad switching window of about three pulse full-width at half maximum (FWHM) can be obtained. The device performance is defined by the pulse duration, the dispersion of the fibe...

We demonstrate new optical techniques for externally controlling the latchable output power of a semiconductor-optical-amplifier-based flip-flop. Optical 'set' and 'reset' signals increase and decrease the re-fractive index, respectively, via cross-phase modulation (XPM). Set signals, which deplete the carrier density, have wavelengths between 1533 and 1568 nm, and powers as low as 22 microW. R...

We demonstrate a regenerative optical grooming switch for buffer-less interconnection of metro/access and metro/core ring networks with switching functionality in time, space and wavelength domain. Key functionalities of the router are the traffic aggregation with time-slot interchanging (TSI) functionality, the WDM-to-ODTM multiplexing and the OTDM-to-WDM demultiplexing of high-speed channel i...

Current spectroscopic optical coherence tomography (OCT) methods rely on a posteriori numerical calculation. We present an alternative for accessing optically the spectroscopic information in OCT, i.e. without any post-processing, by using a grating based correlation and a wavelength demultiplexing system. Conventional A-scan and spectrally resolved A-scan are directly recorded on the image sen...

This paper addresses the scalability (in terms of the number of nodes) of a packetswitched WDM all-optical bi-directional ring for metropolitan area networks. The nodes enable adding/dropping packets to/from all WDM channels on the ring. The nodes are optically transparent to data packets that bypass them. At a linespeed of 2.5 Gbps using directly modulated DFB lasers separated by 400 GHz, EDFA...

A 10-Gb/s phase-locked clock and data recovery circuit incorporates an interpolating voltage-controlled oscillator and a half-rate phase detector. The phase detector provides a linear characteristic while retiming and demultiplexing the data with no systematic phase offset. Fabricated in a 0.18m CMOS technology in an area of 1 1 0 9 mm, the circuit exhibits an RMS jitter of 1 ps, a peak-to-peak...

The ADAPTIVE Service eXecutive (ASX) is an objectoriented framework that enhance the development of distributed applications across a range of operating system platforms. The components in ASX were developed using object-oriented design techniques and C++ language features in order to simplify the use of OS mechanisms that provide interprocess communication, communication port demultiplexing, e...