Agilent N77-Series Attenuators
N7751A 1-Channel Optical Attenuator and Power Meter
N7752A 2-Channel Optical Attenuator and Power Meter
N7761A 1-Channel Optical Attenuator
N7762A 2-Channel Optical Attenuator
N7764A 4-Channel Optical Attenuator
N7766A 2-Channel Multimode Optical Attenuator
N7768A 4-Channel Multimode Optical Attenuator
Data Sheet
Version 2.0
Introduction
The Agilent N775xA and N776xA
series compact multi-channel attenuators and power meters are a new
class of remote controlled fiberoptic
instruments for optical transceiver
and network integration test. High
setting speed of attenuation and
power and power measurement
capability, combined with USB,
LAN and GPIB interfaces provides
increased throughput and operational
efficiency to meet today’s challenges
in manufacturing.
Operation Modes
All attenuators feature both attenuation mode and power control mode.
In attenuation mode, the calibrated
value of attenuation in dB can be set.
The attenuation can be changed at up
to 1000 dB/s or the rate can be set
to values in the range 0-1000 dB/s
for single-mode and 0-80dB/s for
multimode units.
The power control functionality
allows you to set the power level at
the attenuator output. The instrument
uses the feedback signal from a
photodiode after a monitor tap, both
integrated in the instrument, the
desired power level at the output of
the module (Figure 1 and Figure 2).
Power measurements
In addition, the Agilent N7751A and
N7752A attenuators include two extra
optical power meter channels for
convenient power measurements and
setup calibration.
User calibration processes
Comprehensive offset functionality
allows you to calibrate the optical
path in various test set-ups. There is
an offset for the attenuation factor,
and an independent offset for the
output power level, to calibrate for
losses due to patch cords, connectors and switches. Additionally,
wavelength and offset value pairs can
be stored in a table to compensate for
wavelength-dependent effects in the
optical path of the set-up. This allows
you to precisely set the optical power
level directly at the input interface of
your device under test. With the extra
optical power meter channel, calibration is even easier and more convenient. All power related offsets can
be determined by a firmware function
that reads a value from the reference
power meter. The difference
between the power value read by the
reference power meter and the actual
value of the attenuator is automatically stored as the offset.
Key specifications
and features
• 0.05 dB relative power setting
accuracy, 0.1 dB for multimode
• Settling time: 20 ms attenuation,
100 ms power, 200 ms multimode
• Accurate built-in power monitor
• Miniature bulk optics for multi-
mode for best transfer of modal
distribution
• 0.1 to 1000 dB/s or for multimode
to 80 and 1000 dB/s attenuation
transition speed (selectable)
• +23 dBm max. input power
• ≤ 1.2 dB (typ. 1.3 dB MMF) inser-
tion loss
• 45 dB single-mode attenuation
range (typ.)
• 35 dB multimode attenuation range
• -50 dBm to +20 dBm power setting
range (-35 to +20 dBm MMF)
• One half-width rack unit
• Fully compatible with setups and
programs developed using the
Agilent 8157x modular attenuators
• Powerful and user-friendly GUI
software
• Two instrument configurations can
be stored and recalled
When the power control mode is
enabled, the module automatically
corrects for power changes at the
input so that the output power level
you set is maintained. Absolute
power levels can be set with high
accuracy after an initial offset calibration for the uncertainties at connector
interfaces.
Attenuator
Coupler Input Output
Power meter
Figure 1. Optical Attenuator with power control
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The Multi-Channel Attenuator Series – Product
Benefits
Configurations
N776xA multi-channel optical attenuators with internal power
control
The Agilent N776xA multichannel optical attenuators with 1, 2 and 4 attenuator
channels in one unit provide an excellent combination of versatility and density.
1-channel variable attenuator N7761A
2-channel N7762A SMF attenuator or N7766A MMF attenuator
4-channel N7764A SMF attenuator or N7768A MMF attenuator
Compact instrument combines and
integrates multiple functions for setting attenuation and power levels and
optical power measurement to reduce
CAPEX and floor space.
• Fast and precise setting of optical
power levels in parallel with settling times of 100 ms (200ms multimode) for improved throughput.
• The multichannel attenuator sets
and measures several ports at the
same time, saving significant time
characterizing multiport and multichannel components and network
equipment.
• Miniature bulk optics for multimode avoids distortion of modal
distribution and assures stability
and accurate power monitoring.
• Active power control keeps output
power constant.
• The instrument can be controlled
via LAN and USB, as well as GPIB
for compatibility with existing
equipment.
• An easy-to-use and intuitive
graphical user interface speeds up
the integration process.
N775xA multi-channel optical attenuators with
internal power control and external power meter channels
The Agilent N775xA multichannel optical attenuators offer 1 or 2 attenuator
channels combined with two power meter channels in one unit.
1-channel attenuator with two power meter channels N7751A
2-channel attenuator with two power meter channels N7752A
Figure 2. Schematic of multimode
attenuator with collimated beam path for
homogeneous attenuation and monitoring.
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