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October 1, 2009

Question of the Month: Difficulty Transmitting a Digital Optical Signal

Q. I’m having difficulty transmitting a digital optical signal about 75 ft. from a remote Dish satellite receiver to an A/V Home Theater receiver. I’ve added a Toslink repeater/amp device, but to no avail. Do you have any suggestions? – George.

A. Thanks for your e-mail and interesting question.

I suspect the optical pulses are much too weak, even with the Toslink repeater/amp device. I quizzed Axiom’s chief engineer, Tom Cumberland, who stated that a normal plastic fiber-optic link is only good for about 6 to 10 feet. Over longer distances, the plastic fiber-optic link causes the pulses to “blur,” so the optical receiver in the AV receiver can’t distinguish between the “on” and “off” optical pulses that relay the digital code.

Tom says that for a run of 75 feet, you’d need at least five repeater/amps to ensure a robust signal at the Home Theater receiver end. Big telecom companies that do long runs of fiber optic cable in new subdivisions and under city streets normally use the glass (not plastic) fiber optic links, which are much less susceptible to the losses you are experiencing.

Perhaps you should reconsider your installation and move the Dish satellite receiver much closer to the Home Theater receiver so you can get a robust optical connection using inexpensive plastic fiber-optic cable.

Alan Lofft was, for 13 years, Editor in Chief of Sound & Vision, Canada’s largest and most respected audio/video magazine. He edited Sound & Vision (Canada) until 1996, when he moved from Toronto to New York to become Senior Editor at Audio magazine.
Lofft has been writing about hi-fi and video professionally for over 20 years, ever since his first syndicated newspaper column, “Sound Advice”, began appearing weekly in The Toronto Star, Canada’s largest-circulation daily newspaper. In the late 1970s, he became a contributing editor, columnist, and equipment reviewer at AudioScene Canada, the leading national consumer electronics magazine at the time. Find out more about Alan in his bio.

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