About The QED Reference Optical Quartz Cable QED's superior Reference Optical Quartz Toslink cable is made with real glass using QED's proprietary Glasscor technology to virtually eliminate timing errors, distortion and jitter. This has the effect of increasing bandwidth and the accuracy of data transmission, making for a terrifically natural sounding cable. QED Reference Optical Quartz is the first of its kind, consisting of 210 separate boro-silicate glass fibres. The cable allows you to experience stunning sound when connecting DACs, TV's, CD players and Blu-Ray players to amplifiers or receivers because it has a much higher bandwidth and only 1/10th of the attenuation of traditional acrylic fibres. Reference Optical Quartz vastly exceeds the demands for high definition multi-channel digital audio with a bandwidth of over 150MHz which is totally unaffected by bending the cable. Glasscore Technology: QED's new Glasscore technology employs multiple fibre bundles of ultra-fine boro-silicate glass optical fibres (GOF) of no more than 50um each to make up the 1 mm diameter necessary to conform to the Toslink standard connectors. Because the fibres are so small the different paths taken by the light rays are similar in length virtually eliminating the timing error and introducing less distortion and jitter. This has the effect of increasing bandwidth and the accuracy of the data transmission. Stepped Refractive Index: The quartz fibres are coated with a cladding of low Refractive Index to guide the light signal. Over 150MHz Bandwidth: This vastly exceeds the demands for high definition multi-channel HD digital audio. In contrast to conventional acrylic glass optical cables quartz glass cables can deliver signals up to and including 24bit/192kHz with very low jitter. Reference Optical Quartz can provide a much higher bandwidth than a single acrylic glass fibre with 1/10th of the attenuation. Ultra Low Jitter / Ultra Low Loss: QED have calculated that jitter (distortions caused by timing differences between the different light paths) in conventional optical cables could typically reach up to 145ps. In Reference Optical Quartz, timing errors are virtually eliminated, introducing less distortion, jitter and ultra-low loss < 0.03 dB/m. Do Cables Matter? Absolutely! Digital Optical Audio cables are now used widely to connect audio source equipment such as TV's, CD players and Blu-Ray players to amplifiers or receivers. There are many advantages to using the optical output from your source equipment. The optical output provides complete electrical isolation between equipment eliminating ground loops and noise induced by large external voltages or currents. With fast digital signalling using twisted pair copper cables, problems such as near end crosstalk can cause distortion of the signal; these problems are eliminated by using the digital optical connection option. Because of the very short distances and relatively slow data signalling speeds of the Toslink system it is possible to use very inexpensive plastic optical fibres (POF) made of an acrylic glass material known as PMMA (Polymethyl-methacrylate). These are usually 1 mm in diameter to fit the Toslink connector and of course their extra width only exacerbates the time smearing or jitter caused by the multi-modes within the fibre. Calculations have shown that a typical 1m cable with a PMMA fibre of refractive index 1.5 and a critical angle of 76 degrees has the potential to introduce jitter of up to 145ps into the SPDIF signal. These plastic optical fibres (POF) account for virtually all commercially available Digital Optical Audio cables available today. The alternative to this situation adopted by QED in the new Glasscore™ technology cable is to employ multiple fibre bundles of ultra-fine boro-silicate glass optical fibres (GOF) of no more than 50um each (thinner than a human hair) to make up the 1 mm diameter necessary to conform to the Toslink standard connectors. In the new QED Reference Optical Quartz cable there are 210 such fibres each of which guide the light along a much tighter path making the different modes much more uniform than in the larger diameter single fibres. Because the range of angles of incidence at which the light is accepted at the aperture of the cable is smaller and the critical angle of internal reflection in the glass is larger than in POF fibres the range of different paths taken by the light is reduced. In this way short data pulses are no longer artificially elongated or smeared by the physical process of travelling along the cable. Our Take Almost all the optical cables sold today use acrylic strands to transmit the digital signal but not the QED Reference Optical Quartz Toslink cable. QED have instead developed their own proprietary technology called Glasscore which employs multiple fibre bundles of ultra-fine boro-silicate glass optical fibres. This Glasscore™ technology virtually eliminates timing errors and introduces much less distortion and jitter. This has the effect of increasing bandwidth and the accuracy of data transmission, making the QED Reference Optical Quartz one of the most natural sounding digital cables on the market today. Main Features & Specifications Product Description: High Performance Optical Toslink cable Proprietary Technology: Glasscore - a trademark of QED Construction: Unique boro-silicate glass construction Highly Flexible: 210 x 50 micron optical fibre bundle Bandwidth: Over 150MHz Bandwidth Ultra Low Jitter: Yes Ultra Low Loss: < 0.03 dB/m Resolution: Hi-Res 24 & 32 bit high resolution audio compatible Available Lengths: 600mm; 1 Metre; 1.5 Metre; 2.0 Metre; 3.0 Metre QED Product Code: QE3306 Manufacturer's Warranty: Lifetime - Does not cover misuse or abuse Note: Features & Specifications Subject To Change Without Notice. E&OE.
