Much of today’s optical infrastructure is based on 10 Gbit/s SONET/SDH elements such as switches, multiplexers and transponders. At today’s higher data rates, the data bits transmitted across such networks are closely packed together, and Jitter, small timing deviations that vary from one bit interval to the next, increases the probability of errors in the transmitted data.
To help measure optical jitter accurately, Tektronix has recently announced a new instrument that it hopes will enable equipment manufacturers to accelerate the deployment of 10 Gbit/sec SONET/SDH equipment in core metro networks.
The new Tektronix OTS9200 Jitter Analysis Module is claimed to be the world’s first fully digital, as opposed to analogue, optical jitter measurement tool; it has been built on the company’s patented Digital Phase Analysis (DPA) technology.
The OTS9200 performs both jitter generation and jitter tolerance tests It works by time stamping every edge of a SONET/SDH data stream, and because it is digital, it removes the error sources and variables associated with phase lock loop (PLL) circuitry found in current analogue alternatives.