N7785B [AGILENT]
Synchronous Scrambler; 同步扰码器
| 型号： | N7785B |
| 厂家： | 
AGILENT TECHNOLOGIES, LTD. |
| 描述： | Synchronous Scrambler |
| 文件： | 总4页 (文件大小：112K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Agilent N7785B
Synchronous
Scrambler
Data Sheet
Figure 1. N7785B-001 bench-top mainframe
Introduction
As an SOP switch the N7785B allows switching the
internal waveplates to user definable angles with very
high speed and repeatability.
The Agilent N7785B is a high-speed synchronous
scrambler. It contains a polarization controller plus
microcontroller- based driving circuitry. This unit can
operate in various modes:
As a traditional scrambler, the Agilent N7785B varies the
output SOP smoothly in a random/pseudo random way.
As a synchronous scrambler, the device switches the
SOP of the output signal in a random (pseudo) way.
Switching of the SOP occurs within a few microseconds.
The unit does not contain any moving parts, and
therefore is robust and withstands even rough
environmental conditions.
The SOP is stable for a predefined time until it again
switches to a new SOP.
All above-mentioned applications of the N7785B are
supported by Agilent’s PC software package which
comes with this instrument.
An electrical trigger input can be used to synchronize
the scrambler with external events.
N7785B
Synchronous
Scrambler
Key Benefits
●
●
Comprehensive polarization control and
management capabilities
Covers S-, C-, and L-band plus
1.3 µm window
Fiber loop
Pol contr
Switch
Rx unit
Tx unit
●
●
●
Compact size
Robust, no moving parts
PC software package included
Computer
Figure 3. Recirculating loop
Applications
The results obtained in re-circulating loop experiments
depend heavily on the PMD and PDL properties of the loop.
Loop synchronous polarization scrambling schemes have
proven to be necessary for generating results comparable
to deployed systems.
●
Recirculating loop experiments:
-
Loop-synchronous polarization scrambling
●
●
System test: polarization sensitivity analysis
on link / transmission quality
Characterization of optical components
The synchronized scrambling feature of the N7785B
is a unique enhancement to conventional polarization
scramblers. The polarization can be scanned according
to a pseudo-random but reproducible path. Instead of a
continuously changing SOP, the SOP is switched in discrete
steps that are synchronized with an input or output trigger
signal. After switching, a stable SOP is quickly reached and
held until the next step.
Agilent N7785B Instrument Setup and
Application Examples
LiNbO polarization
3
SMF
SMF
The N7785B is ideally suited to provide the synchronous
scrambling capability in such experiments.
controller
This is a key capability for providing realistic change of
polarization from cycle to cycle around the loop, while
providing a stable SOP during passage of the bit train
through the scrambler. This avoids the unrealistic effect
rapid change of the polarization during the bit train caused
by continuous scramblers.
Trigger in
Power In
Microcontroller board
Trigger out
USB
GPIB
Figure 2. N7785B instrument setup
In addition, the N7781B polarization analyzer provides the
capability of monitoring the SOP evolution on each round trip.
The instrument setup is shown in Figure 2. The LiNbO3
polarization controller is controlled by a signal processor
which supplies user-definable sequences to the polarization
controller. In this way, the SOP can be controlled in steps
but also continuously. The trigger system provides synchro-
nization capabilities to external digital signals.
N7785B
synchronous
scrambler
DOP < 5%
Polarized source
Figure 4. Scrambling/Depolarization
Light emitted by a laser is typically highly polarized. In
order to avoid polarization effects it is common in some
applications to depolarize light. This can be achieved highly
effectively using the N7785B synchronous scrambler unit.
2
Agilent N7785B Synchronous Scrambler Data Sheet
Table 1: Specifications1) N7785B Synchronous Scrambler
Wavelength
Operating wavelength range
Polarization Control
SOP switching time
Optical Power
1260 nm ... 1640 nm
< 10 µs
Insertion loss
< 3 dB
Maximum safe input power
20 dBm
1) Ambient temperature change max. 0.5ꢀC since normalization. Specification valid on day of calibration.
Agilent N7785B Synchronous Scrambler Data Sheet
3
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Product specifications and descriptions in this
document subject to change without notice.
© Agilent Technologies, Inc. 2008
Printed in USA, April 29, 2008
5989-8114EN
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