Abstract: Embodiments are presented herein of an open-loop test system for testing vertical-cavity surface-emitting lasers (VCSELs). A high-speed pulse generator may be used to produce nanoseconds pulses provided to the VCSEL device. A high-speed oscilloscope may be used to measure the resultant nanoseconds pulses across the VCSEL device. The VCSEL device voltage and VCSEL device current may be obtained from the measured nanosecond pulses according to compensation data derived from the system. A pre-test compensation procedure may be used to obtain the compensation data, which may include representative characteristics of each system component.

Abstract: A system for holding a device in a computer system, the computer system including a drive cage for holding the device, is disclosed. The system comprises a first rail coupled to one side of the device and adapted to fit into the drive cage and a second rail coupled to the device at a side opposite the one side and adapted to fit into the drive cage, wherein the first and second rails are coupled to the device without requiring a tool. Computer systems utilizing the system in accordance with the present invention, will be better equipped to handle the acoustic vibrations created during the operation of different types of drives such as Direct Access and Storage Devices (DASDs). Accordingly, this will enable computer system manufacturers to incorporate faster DASDs without acoustically coupling the DASD to the chassis. Furthermore, by employing a screw-less rail, PC manufacturers and users will no longer be required to use a tool to remove the attached rails.