Optical test equipment for performance evaluation of installed DWDM systems

We have developed a TOTE/spl trade/ technique for evaluation of the full capacity performance of DWDM systems without need for full terminal equipment. The presented TOTE/spl trade/ design works independently of the system bandwidth and channel spacing and is thus very attractive for performance evaluation of installed DWDM systems. In a 28 nm, transatlantic DWDM field transmission experiment, the presented TOTE/spl trade/ design is verified to accurately measure the same gain shape and performance as the fully loaded transmitter.