One 160 Gb/s optical time division demultiplexer based on two cascaded electro-absorption modulators
as sampling windows was demonstrated and experimentally studied in detail. The two stages were used
for the 160 Gb/s into 40 Gb/s demultiplexing and 40 Gb/s into 10 Gb/s demultiplexing respectively.
In this paper, experimental and theoretical investigations of TOAD system performance are implemented. 80Gb/s to
10Gb/s all-optical demultiplexing by the TOAD is demonstrated successfully. Based on the travelling wave model, the
non-ideal problems encountered in the experiment are analyzed. The results show the position of SOA is no need to be
strictly placed beside the loop midpoint, due to the switching window can be periodically generated with asymmetry values
of SOA, and the position of switching window can be adjusted by varying the temporal deviation between
counter-propagation signals. Furthermore, the unperfected coupling ratio and the synchronization jitter between the signal
and control are crucial limits for the demultiplexing application in 160Gb/s OTDM system.
A novel multi-mode model suitable for semiconductor ring lasers with ultra short optical pulse injection including all nonlinear coupling components is established and used to explore multilongitudinal-mode dynamics. Faster switching off time is predicated.
Using broadband dispersion compensation CFBGs, over 500km-40Gbps NRZ transmission
system on G.652 fiber will be demonstrated without electric regenerator, FEC and Raman amplifier.
The power penalty is about 2dB @ BER =10-10.The CFBGs have better performance: 3dB band is
about 1.2nm, group delay ripple is less than 25ps near center wavelength, power ripple is less than 2dB,
and DGD is less than 1ps. In order to stabilize the DC bias of the LiNbO3 MZ modulator, a
semiconductor cooler is applied to control the temperature. The effect is perfect.
In this letter, aiming to obtain the best multicast performance of optical network in which the video conference
information is carried by specified wavelength, we extend the solutions of matrix games with the network coding theory
and devise a new method to solve the complex problems of multicast network switching. In addition, an experimental
optical network has been testified with best switching strategies by employing the novel numerical solution designed
with an effective way of genetic algorithm. The result shows that optimal solutions with genetic algorithm are
accordance with the ones with the traditional fictitious play method.
A simple theoretical model is proposed for the study of timing jitter induced by intrachannel corss-phase modulation
(IXPM) in chirped fiber grating (CFG) compensating systems. The mechanism how CFG reduces the timing jitter is
studied in detail, theoretically and numerically. The reason why symmetrical power and dispersion scheme could
guarantee zero timing jitter is analyzed.
In this paper we mainly discuss the low-cost way to improve the performances of wavelength routed optical networks. It
is really a tough work to reduce the probability of traffic loss due to the lack of abundant lightpath between arbitrary
nodes connected by precious wavelengths. Aiming to solve the problem, we probe an economical proposal that local
optical nodes can be equipped with extra receiving components with cheap Chirp Bragg Gratings. Under the
experimental platform of single-direction double-fibers optical network rings, this scheme has been verified, showing
the result that the traffic loss ratio can be reduced significantly by adding more Chirp Bragg Gratings especially under
heavy service loads. Consequently, it is feasible to improve the performance of all optical networks with several groups
of Chirp Bragg grating fibers with whole consideration of cost-effective optical network design.
KEYWORDS: Synthetic aperture radar, Navigation systems, Radar, Mathematical modeling, Global Positioning System, Antennas, Control systems, Data modeling, Mathematics, Computing systems
This paper puts forward to a geometric preprocessing model based on differential GPS (DGPS) and inertial measurement unit (IMU) data for airborne SAR image. Firstly, the DGPS/INS data are preprocessed to determine the SAR antenna centroid and platform attitude. Secondly, relative to SAR navigation coordinates system, observational coordinates of the radar images are calculated. Finally, after strip adjustment, the geometrically preprocessed SAR image or SAR ortho-image based on DEM are obtained. The correctness of mathematic model is verified with the results of test area in western part of China. Finally the main systematic error sources are analyzed and their correction method is presented.
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