Hi. I'm not sure how to ID your tree. Perhaps you could take a picture of it, and some leaves/blossoms off of it in the spring and bring them to your local nursery.

I found some information for you about pollination on: http://flowerworldusa.com/info/fruit_trees.html If you go to this site, there are links to charts about which tree type pollinates which.

They say,
"All pear trees will pollinate each other except Seckel and Bartlett varieties. Pear trees should be planted close to each other, within 100 feet or so. Some early blooming European pears will cross-pollinate with late blooming Asian pears. Combination pear trees, with more than one variety grafted onto one stem are also available and a good option for small yards."
and for Asian Pears:
"Asian pears need to have another variety as pollizer. Nijiseiki and Shinseiki are somewhat self fertile in warmer climates. Most varieties will pollinate each other. Late blooming Asians will cross-pollinate with early blooming Europeans. Combination trees are available also and are great for gardens with limited space"

I hope this helps. :)

One way to help narrow down the possibilities is to keep notes about the tree's development during the upcoming year. I.E. bud swell, first bloom open, full bloom, petal fall and so on. That information compared to the same information from trees growing in an area whose climate is similar to yours could at least eliminate some possibilities. If your tree is a micro-climate all bets are off on my idea.

I think one or two common pear selections are pollen sterile and cannot pollinate anything.