Agilent Technologies 81642A Uživatelský manuál stáhnout pdf (Strana 24)

www.agilent.com/comms/lightwave

Signal Conditioning

Agilent 8157xA High-Power Optical Attenuators

•

Low insertion loss of 0.7 dB

•

Excellent Wavelength flatness

•

Wide wavelength coverage in both single mode

and multi mode fiber

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High attenuation resolution of 0.001 dB

•

Active power control option

Modular Design, Fit for Various Component and

Network Solutions

Agilent’s 8157xA variable optical attenuators are a family of plug-in

modules for Agilent’s Lightwave Solution Platform 8163A/B, 8164A/B

and 8166A/B. The attenuator modules 81570A, 81571A and 81578A

occupy one slot, while modules 81576A and 81577A occupy two slots.

With 17 slots, the Agilent 8166A/B Lightwave Multichannel System

can host up to 17 single slot modules or up to 8 dual slot modules.

Variable Optical Attenuators

The Agilent 81570A, 81571A and 81578A are small, cost effective

attenuator modules with high resolution. They feature excellent wavelength

flatness and can handle high input power levels. Various calibration

features allow the user to set a reference power. Both the attenuation

and the power level, relative to the reference power, can then be set and

displayed in the user interface. An integrated shutter, which can be used

for protection purposes, or to simulate channel drops, is available.

Attenuators for High Optical Input Power

The Agilent modules feature excellent wavelength flatness and can handle

high input power levels of 2 mW. Combined with their low insertion loss,

they are ideal for optical amplifier tests, such as characterization of EDFAs

and of Raman amplifiers, as well as for other multi-wavelength

applications, such as DWDM transmission system test.

Attenuators with Power Control

Agilent’s 81576A and 81577A attenuators feature power control

functionality that allows you to set the output power level of the attenuator.

The attenuator module firmware uses the feedback signal from a photo

diode after a monitor tap, both integrated in the module, to set the desired

power level at the output of the module. When the power control mode is

enabled, the module automatically corrects power changes at the input to

maintain the output level set by the user. After an initial calibration for the

uncertainties at connector interfaces, absolute power levels can be set

with high accuracy. The absolute accuracy of these power levels depends

on the accuracy of the reference power meter used for calibration.

Tranceiver and Receiver Test

Calibration Processes

The Agilent optical attenuator modules feature excellent

wavelength flatness and can handle high input power levels.

Combined with their low insertion loss, they are ideal for optical

amplifier tests, such as characterization of EDFAs and of Raman

amplifiers, as well as for other multi-wavelength applications,

such as DWDM transmission system test. One unique feature

is a wavelength offset table which enhances calibration

capacity by setting the integral power of a DWDM signal

with a known spectrum.

Equalized Tx signal in EDFA test using wavelength calibration offset table

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 39 40

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