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Final Taper Diameter, =m
Pulling Distance, mm
Final Taper Diameter as a Function of Pulling Distance for a
Hot Zone Length of 6.0mm
Calculated
Measured
Figure 5.7: Taper waist diameter as a function of pulling distance
using a flame-brush tapering system.
To ensure that the fiber was tapered adiabatically, it was necessary to examine the
transmission properties of the taper. This was done in two ways. First, we measured the
transmission of the fiber during the tapering process. A fiber-coupled Newfocus
Velocity™ tunable diode laser was connected to one end of the fiber via a bare fiber
adaptor. The other end of the fiber was connected directly to an ILX Lightwave OMH-
6727B InGaAs Wavehead spherical integrator detector powered by an ILX Lightwave
OMM-6810B power meter. The power of the laser was kept constant and the wavelength
was fixed at 1550nm. A labview program recorded the power collected by the detector 10
times every second while the fiber was heated and pulled. Figure 5.8 shows the fiber
transmission as a function of time during the taper process. The right vertical axis shows
the diameter of the fiber as it is tapered. The fiber diameter curve is initially flat because
Object Description
| Title | Silicon-based photonic crystal waveguides and couplers |
| Author | Farrell, Stephen G. |
| Author email | stephenf@usc.edu; sgfarrell@yahoo.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Electrical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2008-09-05 |
| Date submitted | 2008 |
| Restricted until | Unrestricted |
| Date published | 2008-10-20 |
| Advisor (committee chair) | O'Brien, John D. |
| Advisor (committee member) |
Dapkus, P. Daniel Steier, William Haas H., Stephan |
| Abstract | Most commercial photonics-related research and development efforts currently fall into one or both of the following technological sectors: silicon photonics and photonic integrated circuits. Silicon photonics [18] is the field concerned with assimilating photonic elements into the well-established CMOS VLSI architecture and IC manufacturing. The convergence of these technologies would be mutually advantageous: photonic devices could increase bus speeds and greatly improve chip-to-chip and board-to-board data rates, whereas photonics, as a field, would benefit from mature silicon manufacturing and economies of scale. On the other hand, those in the photonic integrated circuit sector seek to continue the miniaturization of photonic devices in an effort to obtain an appreciable share of the great windfall of profits that occur when manufacturing, packaging, and testing costs are substantially reduced by shrinking photonic elements to chip-scale dimensions. Integrated photonics companies may [12] or may not [34] incorporate silicon as the platform.; In this thesis, we seek to further develop a technology that has the potential to facilitate the forging of silicon photonics and photonic integrated circuits: photonic crystals on silicon-on-insulator substrates. We will first present a brief overview of photonic crystals and their physical properties. We will then detail a finely-tuned procedure for fabricating two-dimensional photonic crystal in the silicon-on-insulator material system. We will then examine transmission properties of our fabricated devices including propagation loss, group index dispersion, and coupling efficiency of directional couplers. Finally, we will present a description of a system for adiabatically tapering optical fibers and the results of using tapered fibers for efficiently coupling light into photonic crystal devices. |
| Keyword | photonics; photonic crystal; silicon; integrated photonics; SOI; optoelectronics; waveguides; couplers; optical fiber; tapered fiber; evanescent coupling; adiabaticity; silicon photonics |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m1681 |
| Contributing entity | University of Southern California |
| Rights | Farrell, Stephen G. |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | cisadmin@lib.usc.edu |
| Filename | etd-Farrell-2433 |
| Archival file | uscthesesreloadpub_Volume32/etd-Farrell-2433.pdf |
Description
| Title | Page 123 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | 112 0 10 20 30 40 50 60 70 80 5 10 15 20 25 30 35 40 45 Final Taper Diameter, =m Pulling Distance, mm Final Taper Diameter as a Function of Pulling Distance for a Hot Zone Length of 6.0mm Calculated Measured Figure 5.7: Taper waist diameter as a function of pulling distance using a flame-brush tapering system. To ensure that the fiber was tapered adiabatically, it was necessary to examine the transmission properties of the taper. This was done in two ways. First, we measured the transmission of the fiber during the tapering process. A fiber-coupled Newfocus Velocity™ tunable diode laser was connected to one end of the fiber via a bare fiber adaptor. The other end of the fiber was connected directly to an ILX Lightwave OMH- 6727B InGaAs Wavehead spherical integrator detector powered by an ILX Lightwave OMM-6810B power meter. The power of the laser was kept constant and the wavelength was fixed at 1550nm. A labview program recorded the power collected by the detector 10 times every second while the fiber was heated and pulled. Figure 5.8 shows the fiber transmission as a function of time during the taper process. The right vertical axis shows the diameter of the fiber as it is tapered. The fiber diameter curve is initially flat because |
