I believe the jack actually is outfitted so that there is a optical driver in the center of what would be the pin--its a multipurpose connector. So, you should just be able to get an optical connector outfitted one of those or get an adapter...
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You can get an adapter at Radio Shack.
Outboard DAC's such as the Headroom Micro DAC will accept an optical S/PDIF digital input.
Link is: http://www.headphone.com/products/headphone-amps/the-micro-line/headroom-micro-dac.php