In this report the new black-glass fiber-preform fabricated by the vapor-phase axial deposition (VAD) method to realize high-resolution optical bundle fibers is discussed with the Energy Dispersive X-ray (EDX) analysis and the transmittance spectrum measurement. The black glass consists of SiO2, GeO2, Bi2O3 and Al2O3. Firstly, the rod-shaped soot of SiO2 and GeO2 is prepared by blowing SiCl4 and GeCl4 into the oxyhydrogen burner. Then the soot is dipped into the solution of the Bi and Al compounds. After drying the soot with Bi and Al penetrated, the soot is consolidated into the glass preform by heating with the carbon heater at 1650 degrees Celsius. The diameter of the obtained preform is 10.5 mm and the black glass layer thickness is 2.6 mm located at the periphery. The Bi concentration distribution shows the content of several wt% in the black glass layer. The black glass preform is drawn into the black optical fiber being expected to make a clear image because of no light leaking from the neighboring optical fibers as compared to the conventional fiber endoscope.
1.3 - 1.55 micron optical amplifiers for the long distance up-stream and down-stream networks for a future increase of fiber access networks in telecommunications are attractive. A bismuth-doped silica glass has a potential of the broadband spectrum as lasers and amplifier applications at 1.3 -1.55 micron. The bismuth-doped fiber lasers and amplifiers were discussed by the MOCVD method. In this report optical amplification characteristics at 1.3 - 1.55 micron are presented with the water free hexagonal double-clad bismuth-doped silica fiber (HDC-BDF) made by the vertical axial vapor-phase deposition (VAD) method. The bismuth and aluminum ions were vapor–phase doped into the silicon and germanium oxide. Pumping into the HDC-BDF was performed by using the tilt-polished fiber from the hexagonal surface with the multimode fiber pigtail of the pumping LD. 2 dB amplified gain was obtained with less than -40 dBm CW input signal power at 1310nm.
1.3 μm optical amplifiers for the long-distance up-stream networks are attractive for a future increase of fiber access network in telecommunications. In this report an optical amplification with Bi doped silica fiber (BDSF) fabricated by the vapor axial deposition (VAD) method is presented at 1300 nm.
Polysilane waveguides present advantages of ease in processing using photo-bleaching technology for drawing Bragg
grating on the polysilane film and a larger thermo-optic (T/O) effect more than silica. In this paper we present the
tunable lasers (TLs) composed of the LD module and the optical switch and grating circuits, and those characteristics.
The TLs oscillate with the reflected wave at the Bragg grating. The switches and Bragg gratings, which are fabricated on
the polysilane waveguide, are used for rough and fine tuning operations. The switches are composed of directional
couplers with the thin film metal heaters. A channel selection at each output port is performed by choosing specific
heaters. The wavelength fine tuning is performed with T/O effect on the Bragg grating. The laser oscillation with the
monolithic optical circuit showed that the oscillation wavelength was 1564.16 nm, laser power was -9 dBm, oscillation
bandwidth was less than 0.1 nm and the power ratio between main and side modes was more than 30 dB.
The polysilane optical waveguide fabrications by using photo-bleaching technology with the UV lamp and the UV laser
direct drawing technologies are reported. The characteristics of the 1xN optical waveguide splitters and the
semiconductor tunable lasers (STLs) with polymer tunable external resonators are presented. An average propagation
loss of the straight waveguide was less than 0.7dB/cm at 1550 nm. PDL was measured less than 0.5 dB in the case of 1×8
splitter. The insertion loss of 1×4 splitter patterned by laser drawing method was measured less than 7.5 dB/cm. In the
STLs the external resonator consists of a singlemode polysilane waveguide and a Bragg grating filter. The power ratio
between main and side modes was over 30 dB. Laser power was measured as 5.6 mW at 70% reflective index of the
Bragg grating.
Laser oscillation with polysilane waveguide tunable external resonator was observed at 1537nm. The resonator consists
of the polysilane single-mode waveguide and the Bragg grating on the core. 5.6 mW laser power was obtained with 70%
Bragg reflection. The wavelength shift due to resonator temperature was measured as 0.096 nm/°C in the range of 30-70°C.
Optical switching properties based on the photochromism of spiropyran-doped DNA-lipid complex films have been studied. On-off switching of the incident light under the alternate excitation of UV- and visible light showed strong dependence of the intensity of the excitation light. We have obtained the switching times of around 200-300ms, but much faster response could be expected since the proportional tendency has not been saturated yet.
Optical and photochromic properties of spiropyran-doped DNA-surfactant complex films have been studied. They strongly depended on the type of spiropyran as well as the type of surfactant. Spiropyrans containing the oxazine ring and intercalated into DNA showed very rapid photochromic response. It is also shown that photochromic response times are expected much faster by increasing the intensity of the excitation light.
Optical properties of spiropyran-doped DNA-CTMA films have been studied. They strongly depended on molar ratio of DNA/spiropyran. Switching experiments was performed for 1.55-μm signal light. Measured slow transition times indicate much precise adjustment and optimization.
This paper reports on optical and optoelectronic properties of DNA-surfactant complex films which were intercalated with a NLO dye, Disperse Red 13(DR-13). Circular dichroism (CD) analysis indicated that the orientation of the azo dye, DR-13 doped in DNA-surfactant complex film was achieved by inserting the dye molecules into the nano-size space between base pairs of DNA. The Disperse Red 13-doped DNA thin film displayed higher THG than that of CS2 about two orders. On the other hand, SHG signal could not be observed even in the presence of anisotropic ordering of the molecular chromospheres on template of the double helix of DNA, perhaps because of absorption of the dye for SHG light.
A very thin taper fiber has been produced for a vibration sensing. Frequency characteristics of the sensor up to 2000Hz are measured and the possibility for optical remote sensing a an acceleration measurement tools is discussed.
Silica waveguide technologies have been developed based on a combination of the flame hydrolysis deposition and reactive ion etching, which have the advantage of structure controllability and reproducibility of integrated circuits. The bonding technology using UV adhesive and the mold packaging technology have been developed. Silica waveguide integrated devices such as 1 by N, 2 by N and N by N, polarization maintaining splitters, wavelength division multi/demultiplexers, frequency division multi/demultiplexers, dense WDMs, and optical switching devices can be commercially produced with these technologies.
Silica waveguide integrated technologies have been developed based on a combination of the flame hydrolysis deposition and reactive ion etching which have the advantage of structure controllability and reproducibility. In addition we have developed the hybrid integration of passive components and packaging technology using Yttrium Aluminum Garnet (YAG) laser welding and simple adhesives. Silica optical integrated devices such as lxN splitters wavelength division multiplex/demultiplex (WDM) modules ring resonators Mach-Zehnder interferometers and optical switching devices can be commercially produced with these technologies.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.