The ADuM4160 is a USB port isolator, based on Analog Devices Coupler® technology.

Datasheet: http://www.analog.com/static/imported-files/data_sheets/ADuM4160.pdf

• Direction of Data Flow detection
• Upstream facing port isolation
• Voltage: 3.1 to 5.5V

http://www.analog.com/en/interface/digital-isolators/adum4160/products/product.html

Opticis Fiber Optic USB Extension

http://www.opticis.com/english/02_product/product03_01.htm 

Update:

http://www.opticis.com/2011/english/2_product_M2-100.html

M2-100 extends USB signal up to 40m (130feet):