Re: Suggestions for coupling light from a SM fiber to a rectangular waveguide?
- From: "John_H" <johnhandwork@xxxxxxxx>
- Date: Fri, 14 Jul 2006 16:26:52 GMT
First question to ask yourself: what's the Numerical Aperture for your
waveguide and for your SM fiber?
Since your fiber core is much larger than your waveguide, consider using a
ball lens or Graded Index (GRIN) lens to focus from one to the other.
Because of the tiny dimensions, you'll need tight mechanical constraints or
fine positioning capability.
"Bob Pownall" <repownall@xxxxxxxxxxxx> wrote in message
news:12be82ql8fva8af@xxxxxxxxxxxxxxxxxxxxx
I'm trying to couple 654nm laser light from a 4/125um SM fiber into a
rectangular optical waveguide (0.5um wide by 0.35um high) on an integrated
circuit.
I've been using simple end-fire coupling, with a cleaved fiber brought
close to the waveguide, but the coupling efficiency is horrible - on the
order of 1%.
I've tried using ground and tapered fibers, but they keep breaking on me.
Some other things I've thought of, but haven't yet gotten around to trying
are:
* Attaching a small lens to the cleaved tip of a fiber, and using that to
focus the light into the WG.
* Using a microscope objective "in reverse", so to speak, to collimate and
focus light into the WG. (I'm not sure if I physically have enough room
for something like this.)
* Similar to the above, using some free space optics to collimate and then
focus the laser light into the WG.
Does anybody have another, hopefully better, ideas?
Note that any solution needs to be capable of fine translations. It
wouldn't be much good to focus the beam down to a 1um or less spot size,
but not be able to project the spot onto the end facet of the WG. (i.e.
"Damn - the spot's 10um to the left of the WG. Now I have to tear
everything down and move it over 10um!")
Does anybody have any suggestions for vendors of solutions, or solution
components? (Beyond the "usual suspect", that is - ThorLabs, Melles
Griot, et al.)
Thanks in advance for any suggestions!
Bob Pownall
.
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