JDSU today announced improved
measurement analysis for its industry-leading in-band optical spectrum analyzer
(OSA) for the T-BERD/MTS-8000. The OSA-320 module, a high-performance optical
spectrum analyzer, incorporates a unique and highly accurate method for measuring
the "true" optical signal-to-noise ratio (OSNR) in Reconfigurable
Optical Add/Drop Multiplexer (ROADM) networks.
The JDSU OSA-320 module was engineered to test optical performance in the Agile
Optical Network (AON), a dynamically reconfigurable DWDM network that is designed
to accelerate triple-play service deployment, simplify network management, and
enable advanced wavelength applications at significantly reduced costs.
In the AON, multiple ROADMs with different "filtering" technologies
can be cascaded in a link, creating OSNR measurement problems for conventional
OSA devices that employ out-of-band methods. Even the most recent OSA devices
using the "shoulder method" may not provide accurate OSNR results
for different ROADM filter shapes at high data rates. With JDSU's improved measurement
analysis it is possible to accurately measure the "true" OSNR in all
deployment scenarios of ROADM networks (from 10G to 40G), regardless of the
filter type integrated into the ROADM.
"The new measurement algorithm for the JDSU OSA-320 helps address a major
in testing ROADM networks," said Enzo di Luigi, general manager of JDSU's
optics Communications Test and Measurement group. "Accurately measuring
requires a strong understanding of ROADM network components and architectures,
JDSU is uniquely positioned among test equipment providers to leverage optical
leadership in the ROADM market, including active and passive components and
solutions, allowing us to bring smarter ROADM test solutions to market faster."
In ROADM networks, each channel may traverse different routes, optical amplifiers,
and add-drop filters, resulting in different OSNR for each channel. Conventional
OSA measurements are unreliable, as they indicate OSNR values that are too high
up to 10dB above the true OSNR. JDSU's OSA-320 follows an optical polarization
splitting (OPS) method for measuring OSNR inside the optical channel (in-band
providing the highly accurate, "true" OSNR.