Abstract: Intravascular imaging devices and methods for making and using intravascular imaging devices are disclosed. An example intravascular imaging device may include a catheter shaft configured to be disposed within a blood vessel. The catheter shaft may have an imaging window region and an imaging lumen. The imaging lumen may be configured to accommodate and imaging assembly therein. A distal tip member may be coupled to the catheter shaft. The distal tip member may have a guidewire lumen formed therein. The imaging window region and the distal tip member may axially overlap.

Abstract: An apparatus and method for monitoring of optical signals 60 at a node (12, 14, 16) in a WDM telecommunications system 10 comprising the employment of photodiodes (54, 56, 58). Each of the photodiodes (54, 56, 58) has a short response time relative to a number of bit periods of the optical signal to permit measurement of the optical power thereof. Such a photodiode (54, 56, 58) can be used to monitor many nodes (12, 14, 16) within the system 10 and facilitates monitoring of optical signals in nodes which are far apart. The photodiode (54, 56, 58) also permits the Optical Signal to Noise Ratio (OSNR) of the optical signal 60 to be calculated by obtaining values for a maximum optical power P1 and a minimum optical power P0 for a particular optical signal 60.