OptoTest OP930D User manual

OP930D Functionality

AN-105

805.987.1700

sales@optotest.com

engineering@optotest.com

OptoTest Corp.

4750 Calle Quetzal

Camarillo, CA 93012

Doc: AN-105 Rev. B 12/13 /13

The OP930D is a dual channel insertion and return loss tester. The OP930D is similar to the OP930 except an

additional source port and detector is added to streamline testing of duplex cables and to allow for simplified

testing of cables with unlike connectors. The test system has two source ports and two power meters. While Port A

and Port B are treated as two separate channels, they share the same source modules and are regulated by a 1x2

switch, activating on one channel at a time. The corresponding power meters are configured to expect readings

from their respective source ports when that source is switched on.

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Functionality

The OP930D has one 1310nm and one 1550nm laser (850/1300 for multimode) that are both fed into a 1x2 switch.

This switch sends the selected wavelength into either Port A or Port B; not simultaneously. This switching is seen

in the front panel by the switching LEDs. When Port A is “on,” the corresponding detector expects a measurement.

At this time, Port B is “off” and Detector B is frozen and does not look for any measurements. The same procedure

occurs when Port B is switched active.

1310nm

1550nm

WDM Coupler 1 x 2 switch

to Port B

to Port

Figure 1: Singlemode and multimode schematics for inside of an OP930

850nm

Laser

1300nm

Laser

WDM Coupler

1 x 2 switch

to Port B

to Port

850nm

LED

1300nm

LED

WDM Coupler

2 x 1 switch

Singlemode Schematic

Multimode Schematic

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Overview

OP930D Functionality

NE W

AN-105

805.987.1700

sales@optotest.com

engineering@optotest.com

OptoTest Corp.

4750 Calle Quetzal

Camarillo, CA 93012

Doc: AN-105 Rev.B 12/13 /13

For duplex measurements using the OP930D, connect two reference cables to the corresponding source channel,

and then connect the reference connectors to their corresponding OPM channel.

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Insertion Loss Reference

Figure 2: A reference setup for duplex cable measurement

Figure 3: A duplex return loss reference setup

Cables terminated with a PC polished connector exhibit the inherent 4% reflection (~14dB). This is the ideal

situation for taking the reference. A clean connector interface on both ends, the APC connection at the front panel

of the instrument, and the PC interface of the reference cable are all necessary.

Reference return loss by leaving the PC endface of an APC-PC launch cable unmated. Navigate to the RL screen for

the first channel by pressing the right arrow button twice from the OPM screen. With the launch cable connected

to the front panel, press and hold Ref to begin a return loss reference. Repeat this process for the second set. For

methods of testing APC-APC reference cables, please consult AN-114 RL Testing for APC Cables.

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Return Loss Reference

Dual IL /RL Test Set

dBm

Ref

OP930D

1310

Source

0.00

1550 nm

1310 nm

Detector

0.00

-2.42

-1.72

dBm

Dual IL /RL Test Set

dBm

Ref

OP930D

1310

Source

14.00

1550 nm

1310 nm

Detector

POS 3.3m

77.3 F

minimal length is 3 meters

APC

SAVer**

HPR*

*HPR High Performance Cable

** SAVer Cable

APC

HPR*

SAVer**

APC PC

APC

HPR*

SAVer**

APC

OP930D Functionality

NE W

AN-105

805.987.1700

sales@optotest.com

engineering@optotest.com

OptoTest Corp.

4750 Calle Quetzal

Camarillo, CA 93012

Doc: AN-105 Rev.B 12/13 /13

Connect the cable(s) to be measured to the reference end of the reference cable and the other end of the cable(s)

under test into the optical port of the power meter.

NE W

Testing

Once a proper reference has been taken the instrument will continuously update the return loss value or insertion loss

value depending on what mode it is in. The OPM and IL screens will show the optical power reading and insertion loss

values, respectively, for both channels simultaneously. Each channel has its own return loss mode so that the distance

and the value can be displayed simultaneously.

Figure 5: Front panel display for duplex cable

dBm

Ref

IL 1310nm

-0.18

-0.10

-2.42

-1.72 dBm

dBm

Dual IL /RL Test Set

dBm

Ref

OP930D

1310

Source

-0.18

1550 nm

1310 nm

Detector

-0.10

-2.42

-1.72

dBm

Figure 4: Testing the insertion loss and return loss of a duplex cable

APC

SAVer**

HPR*

DUT***

*HPR High Performance Cable

** SAVer Cable

***DUT Device Under Test

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