How to measure light intensity of 950nm LED

I am trying to come up with a simple circuit/method that can tell me the intensity of a 950nm LED
source after the light travels through a glass fiber bundle. I was looking for a photo resistor (I
figured I coul djust measure the resistance) but can't find one that operates at 950nm.

Basically I want to measure the efficiency of my glass fiber and optical coupling mechansim. I
need to compare the output of the bare LED with the output of the fiber to see how much light
is lost going through the fiber.

I thought of buying an LED testing instrument, but can't get approval for that. I need something
cheap that I can build myself. Does anyone have any ideas?

A standard Si photo-detector diode is sensitive to near IR energy (see this). One of those should work fine for making relative measurements of your 950nm signals, since they generate a fairly linear current proportion to intensity level. You just connect a few volts of DC to reverse bias the detector and measure its current when illuminated.

Look at it through the viewer of a digital camera.