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[Optical Fiber] Coupling 106.5um fiber into 105um fiber

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blueskull:
I was just lurking on Taobao, and found a brand new JDSU 140W pump laser diode for only $400.

While it is a great deal, its output fiber is 0.22NA, 106.5/125um fiber, but all my current fibers and other fiber-coupled optical toys are 105/125um.

I wonder what do I need to couple energy from 106.5um fiber into 105um fiber, and can I just splice them and expect the joint not to set itself on fire (at 140W!!!)? Or do I need some fancy optical setup to match just 1.5um of difference?

FYI, 1.5um looks like just error, that's I wanted to give it a try.

On paper, a standard cheap 105um fiber is actually 105um +- 3um, and a 106.5um fiber is 106.5um +- 1.5um, so technically they do overlap. If I stay with quality manufacturers, I can expect 105um fiber to be bang on, so it falls within the 106.5um fiber's specified range.

Any suggestions if this is a good idea or I'm risking with my $400?

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