Silica based Mach-Zehnder add-drop filter fabricatedwith UV induced gratings

Kohnke, Glenn E.; Henry, C. H.; Laskowski, E.J.; Cappuzzo, M.; Strasser, T.A.; White, Alice E.

doi:10.1049/el:19961067

Cited by 34 publications

(6 citation statements)

References 6 publications

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“…Since this is an order of magnitude higher than the value of 1.6 × 10 3 for quartz under UV irradiation with an excimer laser [9], the use of irradiation to fabricate diffraction gratings should yield high reflectivity.…”

Section: Refractive Index Controllability Of Flupi-cb By Irradiationmentioning

confidence: 84%

Refractive Index Control of Polyimide by Synchrotron Radiation, and the Application to Fabrication of a Waveguide Grating

Kobayashi

Ishii

Maruo

et al. 2002

Electron Comm Jpn Pt II

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SUMMARYSynchrotron radiation alters the refractive index of fluorinated polyimide, and it is possible to adjust the refractive index to within 10 2 by varying the irradiation dose.The chemical condition of the polyimide after irradiation was investigated by XPS, and it was shown that the refractive index change was caused by decreasing molecular volume following separation of fluorine atoms. Using this refractive index controllability and the linearity of the synchrotron radiation, a method of fabrication of a waveguide diffraction grating using only synchrotron irradiation of a fluorinated polyimide optical waveguide through an X-ray mask having a diffraction grating pattern was proposed.

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Section: Refractive Index Controllability Of Flupi-cb By Irradiationmentioning

confidence: 84%

Refractive Index Control of Polyimide by Synchrotron Radiation, and the Application to Fabrication of a Waveguide Grating

Kobayashi

Ishii

Maruo

et al. 2002

Electron Comm Jpn Pt II

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“…5b. 1.20 1.25 1.30 1.35 1.40 1.45 1.50 1.55 1 20 1.25 1.30 1.35 1.40 1.45 1.50 1.55 1 Owing to recent progress in the index modulation of silica waveguides by UV-induced or surface etching [8,11], planar Bragg gratings, which can be easily integrated with other functions discussed previously, are used as the wavelength selective elements to select narrow wavelength spacing or wide band WDM signals. Theoretically, according to the different channel spacing specifications, the 3dB bandwidth of the filter spectrum can be made wider or narrower depending on the length and index profiles of the gratings.…”

Section: Simulation Resultsmentioning

confidence: 99%

Integrated grating-assisted coarse/dense WDM multiplexers

Shen¹,

Huang

2004

SPIE Proceedings

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In wavelength division multiplexing (WDM) systems, coarse and dense WDM (CWDM/DWDM) are two key technologies. In general, it takes two steps to accomplish this mixing (coarse/dense) WDM function. In order to make the WDM device compact and low loss, it is necessary to integrate these two WDM functions into one step. In this paper, we propose two typical designs of the coarse/dense multiplexers, which multiplex the coarse/dense-WDM (C/D-WDM) signals simultaneously. We believe that, although their operation principle is simple, the proposed structures simplify the design of integrated photonic devices and will be the guideline in the development of future WDM devices.

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“…Many types of wavelength MUX/DEMUX devices have been studied. Examples are a ring-resonator type channel-dropping filter (CDF) [6,7], a lattice-filter type CDF [8], and Bragg-grating reflector type optical add-drop multiplexers (OADMs) with a Mach-Zehnder (M-Z) interferometer [13] or directionalcoupler [14] structures. Among these, the Bragg reflector types OADMs are promising for wavelength MUX/DEMUX because of their flat-topped bandpass spectra and wide free spectral ranges (FSRs) as well as their flexible wavelength selectivity.…”

Section: What Is Oadm?mentioning

confidence: 99%

Si-nanowire optical waveguide devices for optical communications

et al. 2005

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Si-nanowire waveguides are attractive structures for constructing various optical devices that are extremely small, and that can be flexibly connected as devices on a silicon (Si) wafer. The waveguides can be bent with extremely small curvatures of less than a few micrometers of bending radius because the large difference of refractive indices between the Si-core (n = 3.5) and the silica cladding material (n = 1.5) strongly confines the optical power in the waveguide core. Therefore, these waveguides are promising for flexible optical interconnections on Si chips as well as for constructing many extremely small optical devices.We used Si-nanowire waveguides to fabricate optical directional couplers and demonstrated their fundamental characteristics. Their coupling-length was extremely short, several micrometers, because of strong optical coupling between the waveguide cores. Therefore, we could construct ultra compact power combiners/dividers. We have also demonstrated wavelength demultiplexing functions for these devices with a long coupled waveguide. Optical outputs from a device with a 100-µm long coupled waveguide changed reciprocally with 20-nm wavelength spacing between the parallel and cross ports. Ultra small optical add-drop multiplexers (OADMs) with Bragg grating reflectors made of the Si-nanowire waveguides have been also demonstrated. The dropping wavelength bandwidth of the OADMs was less than 0.7 nm, and these dropping wavelengths could be precisely designed by adjusting the grating period, and this indicated the possibility of applying these devices in dense WDM systems.Using the Si-nanowire waveguide, we have also demonstrated nonlinear-optic effects such as the spectral broadening of optical short pulses due to self-phase modulation and nonlinear transmittance based on two-photon absorption. At a 12 W input power level, we observed a 1.5-π nonlinear phase shift as well as strong saturation of optical output power from a 4-mm Si-nanowire waveguide sample, and that indicates the possibility of constructing integrated nonlinearoptic wavelength conversion devices or optical limiters with Si-nanowire waveguides.

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Silica based Mach-Zehnder add-drop filter fabricatedwith UV induced gratings

Cited by 34 publications

References 6 publications

Refractive Index Control of Polyimide by Synchrotron Radiation, and the Application to Fabrication of a Waveguide Grating

Refractive Index Control of Polyimide by Synchrotron Radiation, and the Application to Fabrication of a Waveguide Grating

Integrated grating-assisted coarse/dense WDM multiplexers

Si-nanowire optical waveguide devices for optical communications

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