To: J Fieb who wrote (36993 ) 11/3/1998 9:01:00 PM From: BillyG Read Replies (4) | Respond to of 50808
Startup says photonic solution provides greater bandwidth(This is "wow" news if true and viable. I wonder what Gilder has to say about it?) By Margaret Quan EE Times (11/03/98, 11:48 a.m. EDT) NEW YORK — Silk Road Inc. (San Diego), a startup, will demonstrate on Tuesday (Nov. 3) a photonically derived solution that enables the transmission of voice, video and data signals on a single wavelength at the speed of light through fiber optic cable. In its technology demo, Silk Road will transmit 144 distinct TV programming signals from a video wall with 144 monitors to a second video wall through a strand of fiber optic cable at 93 gigabits per second. Silk Road's technology simultaneously carries voice, video and data signals over long distances on the backs of photons in a bidirectional laser beam that does not have to be replicated or amplified. Company executives said their photonics solution can be scaled from a network backbone down to a local area network. Silk Road plans to introduce its first transmitter and receiver products early next year. Silk Road (formerly SynComm Inc.) is promoting its photonics-based technology as an alternative to dense wavelength division multiplexing (DWDM), a transmission technology that provides wide bandwidth across networks. Unlike WDM, which uses multiple wavelengths that must be reconditioned to eliminate crosstalk, Silk Road said its single-wavelength solution presents no chance for crosstalk or signal interruption. The technology allows information to be added or removed with a simple beam splitter, so information is available to all nodes in a network at any time and there is no need to disrupt a transmission to add or drop data. In Silk Road's signal-transmission scheme, light is generated from a source and photons that escape from a cavity form a laser beam. As the laser beam shoots down an optical fiber, an external optical modulator narrows the beam and enables electronic signals to be embedded into the beam. The embedded signals are tagged with proprietary frequency ID tags. These tags, which remain linked to the signals, travel down the fiber without interfering with one another. At the receiving end, a key for each tag is matched up with the correct transmission channel to unlock the data, voice or video to be received. Silk Toad calls the technology refractive synchronization communication, which refers to the behavior of the electromagnetic wave inside a crystal of the modulator. Silk Road's technology is broadly described in a U.S. patent, awarded on Oct. 6 to James R. Palmer, the founder and chief scientist for Silk Road, for a Stabilized Distributed Feedback Semiconductor Laser. The initial patent was deliberately obscure to protect the company's intellectual property, executives said. Silk Road has submitted 250 additional patent claims that further detail the company's work. Palmer has a distinguished career in optics. He served as chief optical scientist on the Strategic Defense Initiative project of the U.S. government, held a professorship at Trinity College, and received the Rudolph Kingslake Award in 1984 for his work in optics. Asked why other companies haven't pursued similar technology to obtain greater bandwidth, Robert Freeman, vice president of operations for Silk Road, said others have focused their money and resources on WDM technology. SilkRoad has met with Lucent, Ciena, Nortel and Siemens, Freeman said. Those companies were "dumbfounded" by the technology, he said. eet.com