Re: A way to measure OWLS...and verify the constancy of the one way speed of light

bz wrote:
Make it simpler. Use an oscilliscope, a laser diode, a 1000 meter length of fibre cable and a photo diode.
Use a pulse generator, you might save money by using the square wave calibration signal that most scopes have built in. You measure the time delay introduced by the fiber cable. You make sure that moving the cable around [without moving the end of the cable away from the photodiode] has no effect on the delay introduced by the cable.

This merely establishes that the round-trip speed within the cable does not depend on its orientation. It says nothing at all about the difference between east->west propagation compared to west->east propagation in the cable, it ONLY shows that east->west->east propagation is the same as west->east->west propagation (and other orientations as well), in the cable.


You then start to move the end of the cable away from the photodiode and measure the INCREASE in delay. That increase is the one way speed of light.

Not true. You make the same mistake that the C.J.Luke keeps making -- you forget that in moving the cable end to the west you change the amount of east->west vs west->east traveling the signal makes within the cable.

In fact, for a change dL to the west, the dime delay dt is:

	dt = c1*dL + c2*dL - c3*dL

where c1 is OWLS(west->east in vacuum/air), c2 is OWLS(east->west in cable), and c3 is OWLS(west->east in cable). Only if c2=c3 can you get the answer you desire, and you have no way to establish that equality (i.e. isotropy of OWLS in the cable).


There is no possible variation of this technique that can avoid this problem. For the simple reason that this is INHERENTLY a round-trip measurement, and no round-trip measurement can establish anything about OWLS.

Note that the observed isotropy in TWLS measurements puts a constraint on any anisotropy in OWLS, but that constraint is rather loose, and certainly doesn't require OWLS to be isotropic.


Tom Roberts	tjroberts@xxxxxxxxxx
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Relevant Pages

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