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Journals and Conferences
We report what is believed to be the first demonstration of optical fiber gratings written in photonic crystal fibers. The fiber consists of a germanium-doped photosensitive core surrounded by a hexagonal periodic air-hole lattice in a silica matrix. The spectra of these gratings allow for a detailed characterization of the fiber. In particular, the… (More)
Link control, a new technique for protecting surviving channels on a per-link basis from fast power transients resulting from network reconfigurations or line failures, is demonstrated in a 560-km eight-amplifier wavelength division multiplexed link carrying seven 2.5-Gb/s channels plus the link control channel.
The properties and fiber dependence of distributed Raman pre-amplifiers and, in particular, the effects of Rayleigh backscattering, which limits the sensitivity improvements that can be realized, is discussed. Bit-error-rate (BER) measurements show improvements In the effective receiver sensitivity of 6.2 and 7.0 dB for dispersion shifted fiber (DSF) and… (More)
Novel devices only offer reasonable telecommunication solutions when they can be packaged and manufactured efficiently and at low cost. We demonstrate such a compact and power efficient tunable dispersion compensating fiber Bragg grating (FBG) device. The device relies on a distributed on-fiber thin-film heater deposited onto the outer surface of an… (More)
We present a new type of long-period fiber gratings with enhanced temperature sensitivity of 80 nm/100/spl deg/C via the use of specially designed polymer. New structures are presented, which should enable tunable filters for communications systems.
We examine the cladding-mode resonances of fiber gratings UV written into the core of a novel microstructured fiber whose air regions are subsequently infused with polymer. The cladding spectrum changes with temperature because of the strong temperature dependence of the polymer refractive index and we show that these changes can be understood qualitatively… (More)
Remotely pumped post- and preamplifiers are employed in an 80-Gb/s wavelength-division multiplexed repeaterless transmission system with a transmission distance of 352 km and a fiber loss of 65.3 dB. Low-loss silica-core fiber combined with dispersion compensation in the receiver is used to maximize the transmission distance. The eight channels which range… (More)
We describe an 8-channel access passive optical network using a fiber grating router at the remote node, 50 Mb/s 1550-nm WDM downstream transmission from an integrated multifrequency laser, and 3 Mb/s 1300 nm SCMA upstream transmission. This approach combines the advantages of a downstream WDM PON and an upstream low-cost power-combining PON.
This paper discusses conceptual elements and preliminary results of a workflow assessing habitat distribution and quality by means of object-based image analysis in a riparian forest. This follows the design of a ‘site-level’ service within the EC GMES project MS.MONINA to support the implementation of the Habitat Directive in Europe by providing dedicated… (More)
We fabricate highly blazed, polarization-sensitive fiber grating taps and show how these may be used in combination with a UV-induced fiber waveplate to form a compact, in-fiber polarimeter. We show how the polarimeter may be employed as a feedback element to control polarization and use the feedback loop to demonstrate the stable, broadband (>70 nm)… (More)