99 research outputs found
Micro Talk Systems
This case focuses on a unique and often overlooked product market – sporting event timing systems and supplies – and involves a Japanese manufacturer of radio frequency identification (RFID)-based timing systems called Micro Talk Systems or MTS. Some of the challenges facing MTS, as they begin to penetrate the U.S. timing market, include identifying the size and scope of the timing market, which market segment(s) should MTS focus on, what is the competitive advantage(s) MTS holds compared to other timing systems being marketed in the U.S., and which channel(s) of distribution would prove to be the most efficient and cost effective to use
Phase shift keyed systems based on a gain switched laser transmitter
Return-to-Zero (RZ) and Non-Return-to-Zero (NRZ) Differential Phase Shift Keyed (DPSK) systems require cheap and optimal transmitters for widespread implementation. The authors report on a gain switched Discrete Mode (DM) laser that can be employed as a cost efficient transmitter in a 10.7 Gb/s RZ DPSK system and compare its performance to that of a gain switched Distributed Feed-Back (DFB) laser. Experimental results show that the gain switched DM laser readily provides error free performance and a receiver sensitivity of -33.1 dBm in the 10.7 Gbit/s RZ DPSK system. The standard DFB laser on the other hand displays an error floor at 10(-1) in the same RZ DPSK system. The difference in performance, between the two types of gain switched transmitters, is analysed by investigating their linewidths. We also demonstrate, for the first time, the generation of a highly coherent gain switched pulse train which displays a spectral comb of approximately 13 sidebands spaced by the 10.7 GHz modulation frequency. The filtered side-bands are then employed as narrow linewidth Continuous Wave (CW) sources in a 10.7 Gb/s NRZ DPSK system
Generation of 1.024-Tb/s Nyquist-WDM phase-conjugated twin vector waves by a polarization-insensitive optical parametric amplifier for fiber-nonlinearity-tolerant transmission
Spectrally-efficient 17.6-Tb/s DWDM optical transmission system over 678 km with pre-filtering analysis
Lowloss mode coupler for mode-multiplexed transmission
Abstract: We present a novel low-loss 3-spot mode coupler to selectively address 6 spatial and polarization modes of a few-mode fiber. The coupler is used in a 6 Ă— 6 MIMO-transmission experiment over a 154-km hybrid span consisting of 129-km depressed-cladding and 25-km graded-index few-mode fiber
Signed frequency offset measurement for direct detection DPSK system with a chromatic dispersion offset
Space Division Multiplexing in Optical Fibres
Optical communications technology has made enormous and steady progress for
several decades, providing the key resource in our increasingly
information-driven society and economy. Much of this progress has been in
finding innovative ways to increase the data carrying capacity of a single
optical fibre. In this search, researchers have explored (and close to
maximally exploited) every available degree of freedom, and even commercial
systems now utilize multiplexing in time, wavelength, polarization, and phase
to speed more information through the fibre infrastructure. Conspicuously, one
potentially enormous source of improvement has however been left untapped in
these systems: fibres can easily support hundreds of spatial modes, but today's
commercial systems (single-mode or multi-mode) make no attempt to use these as
parallel channels for independent signals.Comment: to appear in Nature Photonic
Enhanced Site specific Preparation of SEM Cross Sections and TEM Samples by using CrossBeam Technology
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