Atec JDSU-T-Berd-8000 - Manual (Page 3)

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MTS/T-BERD 8000 Platform – Optical Spectrum Analyzers
New in-band OSNR measurement technique
In ROADM networks the noise floor in between optical channels is suppressed by the optical fil-
ters inside the ROADMs. In systems transmitting
ultra high data rates like 40G/100G at tight channel
spacing of 50 GHz, the modulation bandwidth is
larger than the channel bandwidth thus leading to
overlapping spectra. Both effects make conventional
OSNR measurement based on the IEC interpolation
method unreliable.
The OSA-500R is JDSUs second generation of opti-
cal spectrum analyzers performing the in-band
OSNR A new optical polarization splitting (OPS) method (patent pending) is used to suppress the
transmission signal and to get access to the noise value inside the optical channel for measuring the
true in-band OSNR. The only viable solution for any test scenarios, whatever the ROADM filter
types, data rate or modulation formats.
Built-in test applications
Test applications for optical amplifiers (EDFA) and laser sources (DFB) facilitate network compo-
nent verification.
Drift measurements
For optical performance monitoring it is essential to measure the key parameters over time. The
built-in drift test application provides the result of power, wavelength and OSNR over a customer
definable time frame in a graphical and numerical format. Drift measurements are important in
CWDM networks with uncooled laser, which have a typical wavelength of 0.1 nm/°C.
PMD test options
With the PMD option, the OSA can measure the differential group delay (DGD) for PMD charac-
terization of optical fibers and systems. The measurement is based on the fixed analyzer method
(TIA/EIA FOTP-113) together with a broadband source and a variable polarizer.
Channel isolation (drop) and dual-port options
A unique channel isolation option is provided to extract a single DWDM channel from the entire
spectrum for further analysis with a SONET/SDH or Ethernet analyzer at data rates up to 12.5
Gbps. The built-in tracking function provides wavelength locking to the peak of the selected chan-
nel in order to avoid channel frequency drift problems during long-term measurements. The
dual-port option (JDSU patents) provides simultaneous measurement of two optical signals, mea-
suring the input and output of an optical amplifier at the same time, for example.
Advanced analysis solution
JDSU’s OFS-100 Optical FiberTrace Software is a PC-based software application within a true
Microsoft Windows environment, offering post-analysis capabilities and the generation of detailed,
professional OSA reports. Offline analysis OFS-100
EDFA test application
In-band noise measurement of optical channels passing
different routes in a ROADM network
Drift analysis