Ion-Exchanged Waveguides in Glass Doped with PbS Quantum Dots

The lowest-loss (≤1 dB/cm) ion-exchanged waveguides in glass doped with PbS quantum dots are presented. Near-field mode profile and refractive index profile using the refracted near-field technique were measured for these waveguides. We demonstrate that the optical properties of this glass unchanged during the ion-exchange process

Photosensitivity and thermal stability of UV-induced fiber Bragg gratings in phosphate glass fibers

The photosensitivity of highly Er/Yb doped and undoped phosphate glass fibers is characterized under irradiation with intense pulsed 193 nm light from an ArF excimer laser through a phase mask. The ultraviolet photosensitivity of the active fibers is shown to be roughly half that of the passive fibers. We also demonstrate that the strong growth of the fiber Bragg grating reflectivity observed upon heating at temperatures between 100 - 250 degrees C is directly related to the UV irradiation time, but not to the size of the index modulation of the seed grating or even to the fiber type (Er/Yb doped or undoped). The conditions to reliably obtain final index modulations amplitudes between 5 and 10 x 10(-5) are given

High-performance photorefractive polymer operating at 1550 nm with near-video-rate response time

© 2005 American Institute of Physics. The electronic version of this article is the complete one and can be found at: http://dx.doi.org/10.1063/1.2117610DOI: 10.1063/1.2117610The development of a high-performance photorefractive polymer composite operating at 1550 nm is reported. We show 40% internal diffraction efficiency with response time of 35 ms and a net gain of 20 cm ⁻¹ in four-wave mixing and two-beam coupling experiments, respectively. This is more than an order of magnitude improvement in the diffraction efficiency and net two beam coupling gain and two orders of magnitude in the response time than the previously reported photorefractive polymer operating at this technologically important wavelength. The improvement in photorefractive characteristics is accomplished by an enhanced orientation of the nonlinear optical chromophore in the present composit

Short monolithic dual-wavelength single-longitudinal-mode DBR phosphate fiber laser

We propose and demonstrate a 5-cm-long monolithic dual-wavelength single-longitudinal mode distributed Bragg reflector (DBR) all-phosphate fiber laser. Strong UV-induced fiber Bragg gratings are directly written in highly Er/Yb codoped phosphate fiber. The separation between gratings is selected as 1 cm to only excite two longitudinal modes in the DBR cavity. By exploiting the spatial hole burning effect and the polarization hole burning effect, stable narrow-linewidth dual-wavelength lasing emission with 38 pm wavelength spacing and a total emitted power of 2.8 mW is obtained from this DBR fiber laser. A microwave signal at 4.58 GHz is generated by the heterodyne detection of the dual-wavelength laser

A short dual-wavelength DBR phosphate fiber laser

A 5cm-long monolithic distributed Bragg reflector fiber laser is fabricated by directly writing Bragg gratings on Er/Yb co-doped phosphate fiber. Stable narrow-linewidth dual-wavelength emission with 38 pm wavelength spacing is achieved. © 2011 OSA

High-performance photorefractive polymer operating at 975 nm

© 2004 American Institute of Physics. The electronic version of this article is the complete one and can be found at: http://dx.doi.org/10.1063/1.1780591DOI: 10.1063/1.1780591A family of photorefractive polymer composites has been developed that enable high-performance device operation at a wavelength of 975 nm. This constitutes a major extension into the near-infrared spectral region for the operation of all-organic photorefractive devices. Utilizing our photorefractive materials, we demonstrate large net two-beam coupling gain of more than 100 cm ⁻¹ 60% diffraction efficiency in four-wave mixing experiments, and a fast response time of 33 ms, at an irradiance of 1 W/cm²

Tdma Few-Mode Passive Optical Network

We demonstrate the first few-mode PON network that can eliminate upstream combining loss. The PON architecture only requires direct detection because TDMA alleviates the need for mode demultiplexing even in the presence of mode crosstalk

Optical Fiber Curvature Sensors Based On Single Mode-7 Core-Single Mode Fiber Structures

A novel curvature sensor based on multicore fiber is presented. This device allows for optical interrogation by either fringe visibility or spectral shift. Experimental results show a repeatable, very stable and high sensitivity fiber sensor. © 2014 OSA

3D Bending sensor combining multicore fiber with a mode-selective photonic lantern

A bending sensor is demonstrated using the combination of a mode-selective photonic lantern and a multicore fiber, for simultaneous measurements of bending direction and radius of curvature