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Non-Tech : Emcore Corporation (EMKR) -- Ignore unavailable to you. Want to Upgrade?

To: The Ox who wrote (261)	9/4/2001 11:52:09 PM
From: The Ox	Read Replies (1) \| Respond to of 640

Stratos Cages VCSELs August 31, 2001...Stratos Lightwave has introduced new cage versions for Small Form-factor Pluggable (SFP) optical transceivers which are designed especially to provide system OEMs more manufacturing options and increased packaging flexibility when designing and building systems using SFP transceivers. The first new SFP cage is the Press-Fit Cage. This cage attaches to the circuit board without soldering. Special diamond-shaped tips on the cage legs press-fit into openings on the circuit board, locking it in place. Stratos' Press-Fit SFP cages fit into the exact same holes, and use the same footprint, as a standard soldered cage, requiring no modification to the circuit board. Stratos Press-fit cages not only offer the benefits of eliminating soldering, they have legs which do not extend through the circuit board. This means that Press-Fit Cages can be mounted back-to-back for highest density. The Press-Fit cage is available pre-assembled, in packaging compatible with standard pick-and-place assembly equipment. The second new cage is designed especially for mounting SFP transceivers in systems using PCI buses and mechanical specifications. The PCI SFP cage accommodates the slightly higher faceplate opening associated with PCI- compatible systems. Since simply raising the height of the entire cage would have adversely affected EMI/RFI performance, Stratos developed a unique angled cage which allows the transceiver to fit the PCI faceplate, but with no degradation in EMI/RFI. The PCI SFP cage is available as a pre-assembled unit or in two separate pieces, and is compatible with non-focused infrared soldering techniques. This cage is available in packaging compatible with pick-and-place equipment. Press Releases InP VCSELs Addressing "Last Mile" Heating Problems August 28, 2001...Researchers at the Walter Schottky Institut in Germany have created a 1.55 µm InP based VCSEL that tackles the heating problems exhibited by some VCSELs, and thus is targeted as a new approach to "last mile" cable applications. WSI views the VCSEL market as being currently restricted to a wavelength of 850 nm, but that those are "not suitable for fiber communications as they can only transmit across distances of a few hundred meters." Explained in more detail, they say that "at 850 nm the damping in the fibers is too high and that light at a wavelength of 1.55 µm however, experiences minimum absorption and can travel up to 50 km." To accomplish this, Markus Ortseifer and his colleagues chose inP-based materials for the semiconductor substrate, rather than GaAs which is used by most 850 nm VCSEL makers. The group devised a novel shape and new semiconductor structures that exploit quantum-mechanical effects. "At present, [our] device shows record performances in each of the relevant characteristics, such as heat output and reliability, compared with any 1.5 µm VCSELs", says Ortseifer. Since VCSELs can be mass produced and tested they will offer a commercially viable route to "fiber to the home" if their performance characteristics can be engineered appropriately. Plans are under way to commercialize the devices. "Our industrial partners have already been given a number of prototypes so that they can evaluate the potential of our VCSELs," adds Ortseifer. "According to their feedback, our lasers already achieve the required performance and show excellent characteristics. There are plans to increase the high-speed characteristics further and to develop wavelength-tunable VCSELs." The lasers have other potential applications, including optical data transmission within computers, and gas sensing for environmental analysis.