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Technology Stocks : Ciena (CIEN) -- Ignore unavailable to you. Want to Upgrade?

To: Frank A. Coluccio who wrote (5314)	11/5/1998 9:47:00 PM
From: E_K_S	Read Replies (3) \| Respond to of 12623

Hi Frank - Did you see that Alcatel (11/5/98) has successfully demonstrated the capability of transmitting more than 15 million simultaneous voice circuits on a four-fibre pair system of transoceanic length. From their press release..."...Utilising wavelength-division multiplexing (WDM), where several channels of information can be sent down a single fibre, Alcatel has achieved a record 6150 km transmission experiment with 32 channels, each at 10 Gbit/s, over a single fibre, giving an overall capacity of 320 Gbit/s per fibre. This experiment is the first reported demonstration of 32 x 10 Gbit/s transmission over transoceanic distances with such efficient use of the optical spectrum, using narrow channel spacing, at 0.4 nm, and 10 Gbit/s bit rate..." I was wondering if they were utilizing DWDM technology and if perhaps CIEN's technology would complement their WDM system? EKS

To: Frank A. Coluccio who wrote (5314)	11/5/1998 10:08:00 PM
From: Curtis E. Bemis	Read Replies (3) \| Respond to of 12623

<SilkRoad tech> I took a look at the SilkRoad link. Tis pretty annoying and pretty much devoid of technical content. Essentially what SilkRoad claims is to have implemented an external EO (ElectroOptical) Modulator which works at OC-48 speeds (2.5 Gbps) and it is able to AM modulate that stream. This simply means they can form light pulses that carry information, "0"s and "1"s at 2.5Gbps. That's all they say and claim to have implemented a photodiode receiver that works at that speed. Well, a lot of folks do similar already, directly with the laser diodes, without external EO Modulation, and they do it at OC-192. DWDW technology uses multiple wavelengths in the same fiber, which means multiple narrowband (much narrower than what SilkRoad uses) sources and all the special passive optics that go with it, like gratings and the like. Optical transmission for long distances invokes many effects that can cause "crosstalk" in DWDM systems. There are a plethora of non-linear optical effects that affect all high power optical systems and these include such things as ASE (Amplified Spontaneous Emission), 4 wave mixing, all in addition to the modal and chromatic dispersive effects which require the use of repeaters to re-time and re-form the optical pulse train that carries the info. So what does all this mean ?? Given what I have seen on what is in the SilkRoad Link, and I am not a technical expert on SilkRoads offerings, my bet is on DWDM technology-- the CIENs, the LU's the NT's, the Alcatels, the Pirelli's, the UNPH's. I'd rather have a 40 or even 80 channel DWDM box at OC-48, or even OC-192.