Agilent Technologies 81642A Uživatelský manuál stáhnout pdf (Strana 32)

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Systems & Polarization Analysis

Agilent 8169A Polarization Controllers

•

Precise manual and remote adjustments of polarization state

•

Nine Save/Recall registers of SOP

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Continuous auto scanning, tuning the SOP across the entire

Poincare sphere

Developing and manufacturing competitive, high-value components and

systems for today’s optical industries requires precise attention to

polarization sensitivity. The Agilent 8169A Polarization Controllers can help

by saving time, money and effort when measuring and working with

polarization sensitive devices.

Polarization sensitive devices include EDFAs, single-mode fiber, polarization

maintaining fiber, isolators, switches, lasers, couplers, modulators,

interferometers, retardation plates and polarizers. Device performance

will be affected by polarization-dependent efficiency, loss, gain and

polarization mode dispersion. These polarization phenomena enhance

or degrade performance depending on the application area, be it

communications, sensors, optical computing or material analysis.

An Important Part of a Measurement System

A polarization controller is an important building block of an optical test

system because it enables the creation of all possible states of polarization.

The polarized signal stimulates the test device while the measurement

system receiver monitors the test device’s responses to changing

polarization. Sometimes polarization must be adjusted without changing

the optical power. At other times, polarization must be precisely

synthesized to one state of polarization (SOP) and then adjusted to

another SOP according to a predetermined path.

Characterizing polarization effect of passive optical component

The Agilent 8169A Polarization Controller

The Agilent 8169A provides polarization synthesis relative to a built-in

linear polarizer. The quarter-wave plate and half-wave plate are

individually adjusted to create all possible states of polarization.

Predeterministic algorithms within the Agilent 8169A enable the

transition path from one state of polarization on the Poincare sphere to

another to be specified along orthogonal great circles. These features are

important because device response data can be correlated to specific

states of polarization input to the test device. PDL measurement of DWDM

components using the Mueller method is one of the main applications. The

Mueller method stimulates the test path with four precicely known states.

Precise measurement of the corresponding output intensities allows

calculation of the upper row of the Mueller matrix, from which PDL is in

turn calculated. This method is fast, and ideal for swept wavelength

testing of PDL.

Specifications

Specifications describe the instruments’ warranted performance over

the 0° C to +55° C temperature range after a one-hour warm-up period.

Characteristics provide information about non-warranted instrument

performance. Specifications are given in normal type. Characteristics are

stated in italicized type. Spliced fiber pigtail interfaces are assumed for all

cases except where stated otherwise.

Description Agilent 8169A

Operating Wavelength Range 1400 to 1640 nm

Insertion Loss

2,3

<1.5 dB

Variation over 1 full rotation <±0.03 dB3

Variation over complete wavelength range <±0.1 dB

Polarization Extinction Ratio

>45 dB (1530 to 1560 nm)

Characteristic >40 dB (1470 to 1570 nm)

>30 dB (1400 to 1640 nm)

Polarization Adjustment

Resolution

0.18° (360°/2048 encoder positions)

Fast axis alignment accuracy at home position

5,6

±0.2°

Angular adjustment accuracy: minimum step size ±0.09°

greater than minimum step size

<±0.5°

Settling time (characteristic) <200 ms

Memory Save/Recall registers 9

Angular repeatability after Save/Recall

5,6

±0.09°

Number of scan rate settings 2

Maximum rotation rate

360°/sec

Maximum Operating Input Power Limitation +23 dBm

Operating Port Return Loss (characteristic)

Total reflection – Individual reflections >60 dB

Power Requirements 48 to 60 Hz

100/120/220/240 Vrms

45 VA max

Weight 9 kg (20 lb)

Dimensions (H x W x D) 10 x 42.6 x 44.5 cm

3.9 x 16.8 x 17.5 in

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