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