how to characterize a new light injection/extraction technology? by guillaume beaudin...
TRANSCRIPT
How to characterize a new light injection/extraction technology?
By
Guillaume Beaudingui l [email protected]
PhD Student in Electr ical Engineer ing
Univers ité de Sherbrooke
My Background• Centre de recherche en
nanofabrication et nanocharacterization (CRN²)
• Microelectronic• Telecommunications• MEMS• Sensors • Biomedical
• Institut interdisciplinaire d’innovation technologique (3IT)
• New class 100 clean rooms of 450 m²
• 350 users annually and more comming
New 3IT building [2/8]
Motivations• The industry still don’t have standards yet for the light injection.
• The injection/extraction method are at the interface between the chip and the packaging.
• The packaging domain is interested in more improvement for the light injection/extraction method principally for passive alignment.
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Challenges• Because of the large refractive index difference between an optical
fiber and a silicon waveguide, the optical mode has to be adapted when light is transfer from one to another to reduce losses.
Zimmermann et al., 2008
Illustration of the difference between a typical optical fiber and a silicon waveguide optical modes
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Light Injection/Extraction methods• 3 popular methods and a new one :
Facet injection/extraction Grating coupler
Inverted taper New injection/extraction method [5/8]
New Technology• A new method was developed in the CRN² labs permit low loss injection
and extraction (< 1 dB, hopefully).
• Other method characteristics:
• Polarisation dependant• Do not necessitate high resolution lithography• Not very sensitive to the alignment (passive alignment, like V-
grooves should be possible)
• Prototypes were realized in the CRN² labs. A patent is pending on this technology.
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Si-EPIC Project• The new light injection/extraction technology cannot be fabricated with
the actual process.
• Objective:
• Finding a way to characterize the “quality” of the optical signal, particularly the polarization.
Device
?
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Questions
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