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Employing all-optical means to prepare phase-coherent input signal-idler pairs, we implement a multichannel in-line phase-sensitive fiber-parametric amplifier. Feasibility of three-channel operation using a single pump is demonstrated.
Nonlinear phase noise (NPN) in polarization-division-multiplexed DPSK systems is analyzed. It is found that the absolute NPN is inversely proportional to the square-root of channel spacing, while the differential NPN depends on the launch condition.
Benefits provided by a new high-power and low-noise laser for efficient first-order Raman co-pumping are experimentally investigated. 8 times 10 Gb/s WDM channels have been successfully transmitted over 70dB of standard single-mode fiber with realistic system margins.
We demonstrate transmission of 16 WDM channels at 10 Gbit/s with 50 GHz channel spacing over 3 times 80 km NZDSF, with small OSNR penalty, using only a single Raman-pumped dispersion compensating module positioned before the receiver.
The composition-spread approach provides a means for evaluating the maximum photoluminescence in new systems of erbium-containing oxides. Hundreds of combinations of zinc-, bismuth-, gadolinium-, and aluminum-substituted SiO2 are evaluated; the Er:Zn-Ge-Si-O system is particularly promising.
We demonstrate the longest unrepeatered and uncompensated SOA-based transmission of 16times10 Gbit/s channels over 140 km single mode (G.652) fiber. We exploit the DPSK modulation format, two commercial SOA devices and a frequency-periodic narrow optical filter.
Direct-detection differential polarization-phase-shift keying is experimentally demonstrated at 10 Gsymbol/s, in which polarization-phase symbols are differentially decoded by using optical interferometric demodulation and electrical multilevel decision without the need of dynamic polarization control.
A novel 50-GHz interleaved bidirectional transmission system is proposed and experimentally demonstrated using a four-port interleaver to enable unidirectional amplification in a recirculating loop. After 500-Km, < 2.5-dB power penalty has been achieved at 10-Gb/s.
We experimentally demonstrate a stimulated Brillouin scattering free, all fiber phase conjugator using 1-m length of our fabricated bismuth oxide-based nonlinear fiber. Using the conjugator, error-free, dispersion compensated transmission of a 10-Gbit/s NRZ signal over a 150 km SMF transmission link is readily achieved.
The fiber fuse phenomenon was investigated in PANDA-style polarization-maintaining fibers at 1.55 mum. We present fuse velocity and threshold data, and observe different thresholds for fast- and slow-axis alignment.
An EDFA bypass and filtering architecture is demonstrated , allowing a 1310 nm QKD channel to be transmitted over the same fiber as four 1.5 mum WDM channels which are amplified in mid-span.
We have experimentally demonstrated 8 times 10 Gbit/s modified duo-binary RZ (MD-RZ) signal repeaterless transmission over a record length of 240 km standard fibre (SMF-28). A Raman amplifier was used to enhance the OSNR and extend the repeaterless transmission distance with low receiver penalty.
An overview of nonlinearities in optical fibers starting from fundamental interactions to their application in optical communication systems will be presented. Advanced techniques to mitigate or to use fiber nonlinearities will be reviewed.
We present a novel silica fiber taper modal Mach-Zehnder interferometer design for low-cost broadband DPSK demodulation and multi-channel duobinary signals generation. The design is compact, temperature-insensitive and easily fabricated in standard single mode fiber.
We demonstrate an all fiber-based OTDM receiver incorporating clock recovery and demultiplexing functions using short lengths of bismuth oxide-based nonlinear fiber and erbium-doped bismuth oxide fiber. Error-free, overall operation is achieved at 80 Gbit/s and the clock recovery is also shown to be operable at 160 Gbit/s.
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