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A lens-integrated surface-emitting laser array has been developed for an optical module compliant with Parallel Single-mode 4-lane Multi-Source Agreement (PSM4 MSA) for 100GbE applications. High-efficiency optical coupling to SMF with two-lens configuration and uncooled 25-Gb/s operation over all four-channels were demonstrated.
The generation of optical supercontinua in the mid-infrared region and especially their expansion beyond the intrinsic limit dictated by fused silica is currently a subject of high interest. Tellurite and chalcogenide glasses have serious advantages because of their wide transmittance window which can reach more than 10 μm while the Kerr nonlinearity can be 500 times stronger than fused silica. These...
In this paper, design and fabrication results of ‘in-plane’ type MEMS mirror device driven by rotational electrostatic actuators with angle sensing ability are reported for the first time. This MEMS mirror realizes rotational motion of a vertical mirror mounted on the SOI actuator stage, which can deflect or switch the reflected light angle in parallel to the same chip surface. Since optical fibers...
We realize a nanowire which has an optimized nonlinearity and a broad wavelength range of single-mode. For the first time a low threshold supercontinuum generation which is single-mode in the whole spectral range is demonstrated.
An analytical description of the Raman response function of tellurite fiber is provided. The Raman contribution factor fR of 0.51 and Raman time constant of 8.07 fs are obtained from the Raman gain spectrum.
We report what we believe to be the first fabrication of a composite microstructured tellurite fiber that can control chromatic dispersion. We expect efficient nonlinear optical phenomena using this fiber.
In this paper we present the design concept and experimental evaluation results of a newly developed DWDM Radio on Free Space Optics (RoFSO) system capable of transmitting simultaneously multiple RF service signals. The system performance is evaluated under effects of atmospheric turbulence over 1-km free-space transmission. Effectiveness of a proposed tracking scheme used to mitigate beam angle-of-arrival...
The authors have considered that tunable all-optical pulse compression and stretching could be achieved by using custom Brillouin gain lines, which can find enormous applications including dispersion compensating, the final section of the cascaded Brillouin delay lines, in optical communication systems. The authors reported what they believe the first experimental demonstration of all-optical pulse...
Radio on Free Space Optical Link (RoFSO) has been developed to realize a cost effective and universal platform for heterogeneous wireless services as same as RoF. This paper proposes a new link loss model for RoFSOL based on a long-term experiment of RoFSO transmission and a total system design method for four types of wireless services.
We propose and design chalcogenide core tellurite cladding nanofiber and photonic crystal fiber (PCF). The PCF shows zero flattened dispersion with zero slope at 1.5 mum wavelength. The structure can achieve high control on dispersion.
Radio on free space optics (RoFSO) is being developed to realize a cost effective and universal platform for heterogeneous wireless services as same as RoF. The developed RoFSO transceiver can directly transmit some RoF signals from an optical fiber and can receive an RoFSO signal from air into a fiber core. It can achieve an free space for various types of wireless services in an optical wireless...
We report what we believe to be the first demonstration of flat supercontinuum generation expanding from 1000 to 2100 nm from a microstructure tellurite fiber pumped by a tunable ultrafast laser source.
We demonstrate a widely tunable ring-cavity tellurite fiber Raman laser covering the S+C+L+U band. A high optical signal-to-noise ratio of over 60 dB for almost all the tunable range is also obtained.
With the increase of communication demand and the emergence of new services, various wireless technologies have been deployed recently. To achieve the goal of ubiquitous communication, however, a universal platform is necessary to connect all the network facilities and make them communicate together. The transmission of radio on fiber (RoF) has been realized as an attractive means to reach this target...
Radio on free space optics (RoFSO) is being developed to realize a cost effective and universal platform for heterogeneous wireless services as same as RoF. The developed RoFSO transceiver can directly transmit some RoF signals from an optical fiber and can receive an RoFSO signal from air into a fiber core. It can achieve an free space that is transparent for various types of wireless services in...
This paper presents a new statistical model of optical intensity fluctuation (scintillation), considering time correlation of atmospheric propagated optical signal in RoFSO (radio on free space optics) channel. Relationships among frequency characteristic of RoFSO channel, variance of optical intensity, and atmospheric temperature are examined. A p.d.f(probability density function) of scintillation...
Transmission of modulated RF signal using FSO communications links is receiving a lot of research interest recently. We are developing a new advanced DWDM RoFSO link system capable of transmitting multiple RF signals. In this paper, we present results from analytical modeling reflecting on the design parameters of the RoFSO system to evaluate and predict its performance. The parameters of interests...
Near infrared emission with a bandwidth more than 450 nm which should be useful for ultra broadband optical amplifiers and tunable lasers for optical telecommunication, has been observed from Bi-doped lithium alumino silicate glass.
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