Journal: IEEE Photonics Technology Letters
Paper: Bragg Gratings Written in Tapered Solid-Core Photonic Crystal Fibers

AUTHORS: José M. Lázaro, Antonio Quintela, Waclaw Urbanczyk, Jan Wojcik, Jose M. López-Higuera
Abstracts:
Fiber Bragg gratings (FBGs) are very useful in many applications. This is why a higher control of their properties is desirable. Therefore, a grating pre-processing technique, based on the dependence of the index guided photonic crystal fiber (IG-PCF) properties on their structural parameters, is proposed allowing a higher control of the Bragg wavelength. Using the proper combination of thermo-mechanical IG-PCFs tapering and UV photo-inscription methods, it is possible to develop new optical fiber devices. Their effectiveness is demonstrated by comparison with the results on single mode fiber (SMFs). Finally, to demonstrate the feasibility of the technique, a wideband chirped Bragg grating is fabricated.

Journal: Microwave and Optical Technology Letters
Paper: Methodology for all-fiber optical sctive devices by composing the stimulated brillouin scattering spectra

AUTHORS: C.A. Galíndez, F.J. Madruga, J.M. López-Higuera
Abstracts:
The methodology for reshaping and enlarging the Brillouin gain spectral response is proposed in this article as a technique to develop all-fiber optical active devices. It is based on the superposition of the Brillouin scattering spectra from several optical fibers, which are connected in serial, parallel, or both. Additionally, the overall Brillouin gain spectral response can be tailored or customized by tuning the temperature or the strain on the fiber. To experimentally demonstrate the method, we propose a fiber device with a tailored like ‘‘W’’ spectral response. The bandwidth is 190 MHz at 3 dB, centered in 10.765 GHz from the pump wavelength. VC 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1316–1318, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/
mop.25199

Journal: IEEE Photonics Technology Letters
Paper: Bragg Gratings Written in Tapered Solid-Core Photonic Crystal Fibers

AUTHORS: José M. Lázaro, Antonio Quintela, Waclaw Urbanczyk, Jan Wojcik, Jose M. López-Higuera
Abstracts:
Fiber Bragg gratings (FBGs) are very useful in many applications. This is why a higher control of their properties is desirable. Therefore, a grating pre-processing technique, based on the dependence of the index guided photonic crystal fiber (IG-PCF) properties on their structural parameters, is proposed allowing a higher control of the Bragg wavelength. Using the proper combination of thermo-mechanical IG-PCFs tapering and UV photo-inscription methods, it is possible to develop new optical fiber devices. Their effectiveness is demonstrated by comparison with the results on single mode fiber (SMFs). Finally, to demonstrate the feasibility of the technique, a wideband chirped Bragg grating is fabricated.

Journal: Measurement Science and Technology
Paper: Experimental characterization of the spectral effective index dependence of index-guided photonic crystal fibers

AUTHORS: Jose M Lazaro, Antonio Quintela, Karol Tarnowski, JanWojcik, Waclaw Urbanczyk and Jose M Lopez-Higuera
Abstracts:
The effective index of index-guided photonic crystal fibers (IG-PCFs) is experimentally obtained as a function of the wavelength by writing fiber Bragg gratings (FBG) in the fibers. The results are found to be in good agreement with theoretical simulations and are also discussed and compared with measurements on standard telecommunication fibers. Differences between the fibers were observed both in the Bragg grating inscription process and in the evolution of the fiber effective index value with the wavelength, which depends on the fiber cladding microstructure. Index evolution slopes of −2.029 × 10−5 nm−1, −2.044 × 10−5 nm−1 and −1.388 × 10−5 nm−1 were measured for two IG-PCFs and the standard fiber, respectively.