Fiber coupling using Physical Optics Propagation into angle polished fiber

Question

Hello,I am trying to simulate the coupling efficiency for a single mode angle polished fiber using the Physical Optics Propagation tool. The fiber has a standard 8 deg polish and the wavelength I am working with is 1064 nm. One approach I tried is to add ‘dummy’ surface prior to the final IMAGE surface. I tilt the dummy surface by 8 deg and restore the tilt immediately.  i.e. Add a coordinate break before and after this dummy surface with +8 and -8 deg tilt respectively. The thickness for this dummy surface is kept at zero. Finally, I change the dummy surface and  image surface material to SILICA, to represent the fiber core. Is this a correct approach to simulate the angle polish of a fiber or is there a better alternative to specify the fiber type when calculating the fiber coupling efficiency using POP?

Jeff.Wilde · Accepted Answer

Typically, an 8-deg angle-polished fiber is mounted with its axis at a 4-deg angle to the optical axis. Therefore, from the perspective of the coupling optics, it effectively looks like a non-angled fiber mounted with its axis along the optical axis. This means for optimizing coupling optics or simply computing coupling efficiency, you can essentially neglect all tilts for the standard FC/APC configuration.

More detail can be found here:

and here

Not sure if you are using the standard FC/APC configuration, but if not (so that only the fiber endface is being angled and the fiber axis is *not* tilted) then the coupling efficiency will definitely be reduced. In this case, I think the approach you describe should be okay for determining this reduced efficiency. To restore optimal efficiency, set the first coordinate break to 12 degrees and the second coordinate break to -8 degrees.

Regards,

Jeff

Jeff.Wilde · Answer

Not unless you are using polarization mode, in which case the image surface material choice will determine the Fresnel reflection loss from the fiber face.

Fiber coupling using Physical Optics Propagation into angle polished fiber

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