PhD Orals, Christophe Antoine, Fri Sept 7th, 3pm, Ginzton AP200

Christophe Antoine cmgas at
Tue Aug 28 10:42:47 PDT 2007

Ph.D. Oral Examination

Reconfiguring the flow of light: micromachined deformable optical
gratings for multiplexers and tunable lasers

Christophe Antoine
Department of Electrical Engineering
Stanford University

Advisor: Professor Olav Solgaard

Date: Friday, September 7th, 2007
Time: 3:00pm (Refreshments at 2:45pm)
Location: Ginzton Lab, Applied Physics Bldg - Room 200


In optical fiber communication networks, the growth of high-bandwidth
and on-demand applications will require a dynamic allocation of
resources. Reconfigurability becomes hence a key attribute for
next-generation optical components. Using optical
micro-electro-mechanical systems (optical MEMS) technology, deformable
gratings can be used to build such adaptive systems.

In this talk, the design, fabrication and characterization of tunable
blazed gratings (TBGs) are first presented. A TBG is a one-dimensional
stairway-like array of individually-addressable piston mirrors. The
fabrication of a TBG combines KOH etching to define the mirrors and
deep reactive ion etching (DRIE) to create the electrostatic

Then, the architecture for a 1xP cyclically reconfigurable optical
multiplexer is described with a closed-form analytical model for the
grating transmission under a simple actuation scheme requiring only
(P-1) control voltages. The implementation of a 1x3 tunable
demultiplexer in the telecommunication C-band demonstrates the
validity of the concept and the theoretical model.

Finally, a deformable grating is used as the external reflector in a
wavelength-tunable external cavity semiconductor laser. Combining a
model for the grating transmittance with a two-mirror and a
three-mirror cavity analytical model, the wavelengths of the resonant
modes for the cavity are determined and the lasing wavelength is
predicted. Laser tuning over the full grating free spectral range,
across internal cavity modes and across external cavity modes is

Christophe Antoine
PhD Candidate in Electrical Engineering
Email: cmgas at (temporary)
antoine-snowden at (permanent)

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