A method of coupling a high-power optical signal between an optical fiber and
a
mating optical component, the optical signal ranging in wavelength from x to y,
and having a first diameter while propagating in a mode field within the fiber,
the method comprising: (a) converting the high-power optical signal between the
first diameter in the fiber and a second diameter significantly greater than the
first diameter using a GRIN lens fused to an end of the fiber, the GRIN lens having
a diameter substantially the same as that of the optical fiber and a length l complying
with the following equation:
x+nxly+ny,
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