VIAVI Solutions
Data Sheet
VIAVI
Variable Optical Attenuators (mVOA-C)
MAP Series Metrology Grade Optical Attenuator
Key Features and Benefits
y Ultra-low insertion loss (<. dB) and
outstanding spectral uniformity minimize
loss budget utilization
y Fastest transition speed and settling time
in its class reduces testing time
y Optional built-in power monitor provides
comprehensive closed-loop power control
settings
y Optional higher power capability can
withstand up to W input power for
single mode fiber ( mW for multimode
fiber)
Applications
y High accuracy and high repeatability
reduces measurement uncertainty
y Flat spectral response reduces wavelength
dependent uncertainty in CWDM and
DWDM multi-wavelength applications
y Low back-reflection.
y Optional built-in wavelength calibrated
power meter.
y High input power capability for EDFA
testing and multi-wavelength applications
Compliance
y Complies with CE, CSA/UL/IEC-
, plus LXI class C requirements when
installed in a MAP chassis
The Multiple Application Platform (MAP series) Variable
Optical Attenuator (mVOA-C) is a stepper motor and
filter-based attenuator that delivers metrology-grade
programmable attenuation performance in the industry’s
most compact package.
With more than 30 years of leadership in
high-performance attenuators for lab and
manufacturing applications, the mVOA-C1, is
now in its fifth generation. The mVOA is a high-
resolution, wide wavelength-range attenuator
ideal for use in applications such as amplifier
testing, 100/400GE client optic testing and
stressing advanced next generation coherent
long haul interfaces. The attenuator is built on
proven industry leading technology for maximum
reliability and performance.
The module is available in single-mode or
multimode fiber, supports multiple optical
connectors and has versions with either an output
tap or integrated power meter control. The power
control option can function as an in-line power
monitor. It is available in single, dual, or quad
configurations, all in single slot modules. Up to 48 independently
controlled attenuators can be installed in a single 8-slot MAP chassis.
The MAP variable optical attenuator is hot-pluggable and designed
for use with all versions of the MAP series chassis family.
The mVOA has low, industry leading, insertion loss (<0.9 dB) and
exceptional spectral and attenuation uniformity, thus minimizing
loss budget. Making the mVOA ideal for CWDM and DWDM test
applications. The attenuation accuracy (± 0.01 dB) and repeatability
(±0.015 dB) are key to enabling manufacturing test systems that
maximize test yield.
Variable Optical Attenuators (mVOA-C)
Functional Description
The mVOA provides attenuation through an expanded beam modified by a linearly variable neutral density filter.
Precision optical design, optimized over 30 years, is key to guaranteeing low IL/RL and PDL. Management of
the attenuated light is carefully considered in order to ensure high power performance and long-term reliability.
Proprietary motor control algorithms paired with a kinematic drive delivers high speed attenuation change with
industry leading settling time and stability.
There are two modes of operation, attenuation mode and power mode. Attenuation mode, the most basic form
of operation, changes the insertion loss of the module without consideration for the input power. Power mode
sets the absolute power at the output of the mVOA and requires the internal power meter option. When in
power mode, input power tracking can be enabled, which automatically adjusts the mVOA to keep the output
power constant. Multiple power and attenuation offsets are available to compensate for test system losses and
simplifies test system integration.
Options and Configurations
The mVOA can be configured in three possible ways,
1. Standard attenuator (figure 3a): This configuration operates in attenuation mode only. To control output
power, measurement of the input power is required prior to testing.
2. Attenuator with output tap (figure 3b): This configuration operates in attenuation mode only. An output
tap ( for single mode and for multimode) allows the output power to be monitored on an external
power meter.
3. Attenuator with output power monitoring (figure 3c): This configuration operates in either attenuation or
output power mode. Output powers can be set directly. When tracking is enabled the attenuator dynamically
adjusts for input power changes.
An intuitive graphic user interface (GUI) is optimized
for use in either a laboratory or a manufacturing
environment. Efficient transition between summary
and detailed views (figure 1 and figure 2) allow users
to operate at a system level or access the full power
of a module.
Figure mVOA MAP- summary view GUI Figure mVOA MAP- detailed view GUI