Tektronix OI1125 User manual

Instruction Manual

OI1125 E/O Transmitter

071-1052-00

Warning

The servicing instructions are for use by qualified

personnel only. To avoid personal injury, do not

perform any servicing unless you are qualified to

do so. Refer to all safety summaries prior to

performing service.

www.tektronix.com

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes

that in all previously published material. Specifications and price change privileges reserved.

Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

WARRANTY

Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship

for a period of one (1) year from the date of purchase from an authorized Tektronix distributor. If any such product proves

defective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for

parts and labor, or will provide a replacement in exchange for the defective product. Batteries are excluded from this

warranty.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the

warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for

packaging and shipping the defective product to the service center designated by Tektronix, shipping charges prepaid, and

with a copy of customer proof of purchase. Tektronix shall pay for the return of the product to Customer if the shipment is

to a location within the country in which the Tektronix service center is located. Customer shall be responsible for paying

all shipping charges, duties, taxes, and any other charges for products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate

maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting

from attempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair

damage resulting from improper use or connection to incompatible equipment; c) to repair any damage or malfunction

caused by the use of non-Tektronix supplies; or d) to service a product that has been modified or integrated with other

products when the effect of such modification or integration increases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE LISTED PRODUCTS IN LIEU OF

ANY OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY

IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND

EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX

AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR

CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS

ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

OI1125 E/O Transmitter Instruction Manual

i

Table of Contents

General Safety Summary v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contacting Tektronix viii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Getting Started 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Options 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Standard Accessories 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional Accessories 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Functional Check 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Basics 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Handling 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connecting Signals 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Front Panel Connections and Controls 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rear Panel Connections and Controls 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using the Rear-Panel Remote Interface 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Laser Safety Label 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Theory of Operation 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance Verification 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Prerequisites 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Required 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Setup For PV 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Internal Laser 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Modulator Checks 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Modulator Optical Output Using the Internal Laser 44. . . . . . . . . . . . . . . . . . . . . .

Modulator Optical Output Using an External Laser 50. . . . . . . . . . . . . . . . . . . . . .

OI1125 E/O Transmitter Test Record 57. . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inspection and Cleaning 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Care 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Exterior Cleaning 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cleaning Optical Connectors 62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Repackaging Instructions 64. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replaceable Parts 65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Glossary 69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents

ii

OI1125 E/O Transmitter Instruction Manual

List of Figures

Figure 1: OI1125 E/O Transmitter 1. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2: Basic functional test setup 6. . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3: Oscilloscope display of an eye pattern 7. . . . . . . . . . . . . . . . .

Figure 4: Connecting a fiber optic cable 10. . . . . . . . . . . . . . . . . . . . . . . .

Figure 5: OI1125 front-panel connectors 11. . . . . . . . . . . . . . . . . . . . . . .

Figure 6: OI1125 front-panel controls 12. . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 7: OI1125 rear panel 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 8: Laser safety interlock 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 9: Remote Interface connector pinout 16. . . . . . . . . . . . . . . . . . . .

Figure 10: Laser warning label 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 11: Transmitter interconnect diagram 27. . . . . . . . . . . . . . . . . . .

Figure 12: Setup for the output power test 34. . . . . . . . . . . . . . . . . . . . . .

Figure 13: Setup for the output wavelength test 35. . . . . . . . . . . . . . . . .

Figure 14: Setup for the RMS Jitter test 36. . . . . . . . . . . . . . . . . . . . . . . .

Figure 15: RMS Jitter measurement 40. . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 16: Using an eye pattern to check modulator polarity 43. . . . . .

Figure 17: Measurements taken from the eye pattern 47. . . . . . . . . . . . .

Figure 18: Setup for the eye pattern test matrix 51. . . . . . . . . . . . . . . . .

Figure 19: Measurements taken from the eye pattern 54. . . . . . . . . . . . .

Figure 20: Cleaning an optical connector 63. . . . . . . . . . . . . . . . . . . . . . .

Figure 21: Standard accessories 65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 22: Optional accessories 66. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 23: Optional power cords 67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents

OI1125 E/O Transmitter Instruction Manual

iii

List of Tables

Table 1: Power cord options 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 2: Service options 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 3: Standard accessories 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 4: Optional accessories 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 5: Remote Interface signals 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 6: Specifications 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 7: Environmental characteristics 21. . . . . . . . . . . . . . . . . . . . . . . .

Table 8: Electromagnetic compatibility (EMC) 22. . . . . . . . . . . . . . . . . .

Table 9: Safety characteristics 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 10: PV checks 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 11: Test equipment 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 12: Signal conditioning mode settings 38. . . . . . . . . . . . . . . . . . . .

Table 13: Signal conditioning mode settings 45. . . . . . . . . . . . . . . . . . . .

Table 14: Measurement function menu paths 46. . . . . . . . . . . . . . . . . . .

Table 15: Signal conditioning mode settings 52. . . . . . . . . . . . . . . . . . . .

Table 16: Measurement function menu paths 53. . . . . . . . . . . . . . . . . . .

Table 17: OI1125 E/O Transmitter test record 57. . . . . . . . . . . . . . . . . .

Table 18: Internal laser @1550 nm,

optical power @10 dBm (±1 dBm) 58. . . . . . . . . . . . . . . . . . . . . . . . .

Table 19: External tunable laser input,

BERT input @2.488 Gb/s bit rate 58. . . . . . . . . . . . . . . . . . . . . . . . .

Table 20: External tunable laser input,

BERT input @9.953 Gb/s bit rate 58. . . . . . . . . . . . . . . . . . . . . . . . .

Table 21: External tunable laser input,

BERT input @12.50 Gb/s bit rate 59. . . . . . . . . . . . . . . . . . . . . . . . .

Table 22: Inspection check list 62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents

iv

OI1125 E/O Transmitter Instruction Manual

v

General Safety Summary

Review the following safety precautions to avoid injury and prevent damage to

this product or any products connected to it. To avoid potential hazards, use this

product only as specified.

Only qualified personnel should perform service procedures.

While using this product, you may need to access other parts of the system. Read

the General Safety Summary in other system manuals for warnings and cautions

related to operating the system.

Use Proper Power Cord. Use only the power cord specified for this product and

certified for the country of use.

Ground the Product. This product is grounded through the grounding conductor

of the power cord. To avoid electric shock, the grounding conductor must be

connected to earth ground. Before making connections to the input or output

terminals of the product, ensure that the product is properly grounded.

Observe All Terminal Ratings. To avoid fire or shock hazard, observe all ratings

and markings on the product. Consult the product manual for further ratings

information before making connections to the product.

Do Not Operate Without Covers. Do not operate this product with covers or panels

removed.

Use Proper Fuse. Use only the fuse type and rating specified for this product.

Wear Eye Protection. Wear eye protection if exposure to high-intensity rays or

laser radiation exists.

Do Not Operate With Suspected Failures. If you suspect there is damage to this

product, have it inspected by qualified service personnel.

Do Not Operate in Wet/Damp Conditions.

Do Not Operate in an Explosive Atmosphere.

Keep Product Surfaces Clean and Dry.

Provide Proper Ventilation. Refer to the manual’s installation instructions for

details on installing the product so it has proper ventilation.

To Avoid Fire or

Personal Injury

General Safety Summary

vi

OI1125 E/O Transmitter Instruction Manual

Terms in this Manual. These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that could result

in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in

damage to this product or other property.

Terms on the Product. These terms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you read the

marking.

WARNING indicates an injury hazard not immediately accessible as you read the

marking.

CAUTION indicates a hazard to property including the product.

Symbols on the Product. The following symbols may appear on the product:

CAUTION

Refer to Manual

Protective Ground

(Earth) Terminal

Avoid Exposure- Laser Radiation

is Emitted from this Aperture

Symbols and Terms

OI1125 E/O Transmitter Instruction Manual

vii

Preface

This is the instruction manual for the OI1125 E/O Transmitter. This manual

provides user information and performance verification procedures for the

instrument.

Preface

viii

OI1125 E/O Transmitter Instruction Manual

Contacting Tektronix

Phone 1-800-833-9200*

Address Tektronix, Inc.

Department or name (if known)

14200 SW Karl Braun Drive

P.O. Box 500

Beaverton, OR 97077

USA

Web site www.tektronix.com

Sales support 1-800-833-9200, select option 1*

Service support 1-800-833-9200, select option 2*

Technical support Email: [email protected]

1-800-833-9200, select option 3*

6:00 a.m. – 5:00 p.m. Pacific time

* This phone number is toll free in North America. After office hours, please leave a

voice mail message.

Outside North America, contact a Tektronix sales office or distributor; see the

Tektronix web site for a list of offices.

OI1125 E/O Transmitter Instruction Manual

1

Getting Started

The OI1125 (Figure 1) is an electrical-to-optical transmitter that accepts serial

electrical data from a BERT (Bit Error Rate Tester) at rates up to 12.5 Gb/s and

outputs an equivalent high-speed serial optical signal.

The OI1125 Transmitter requires a continuous-wave optical input from a

polarization-maintaining laser source. The transmitter has an internal optical

source that can be used to drive the transmitter optical input, or an external,

tunable laser can be used. You can use the transmitter in a test system with the

OI2125 O/E Receiver to convert the optical signal from a DUT (Device Under

Test) to an electrical signal used by a BERT.

Using the transmitter and receiver combined with a BERT, you can test the bit

error rate of optical signals in DWDM, SONET/SDH, and other optical

transmission systems.

Modulator

out

Modulator

data in

Laser in

Laser out

Laser enable

keyswitch

Figure 1: OI1125 E/O Transmitter

The OI1125 E/O Transmitter provides the following key features:

H Supports standard SONET data rates from OC48 to OC192 and FEC data

rates up to 12.5 Gb/s

H Optical wavelength range designed to operate in C band (1530 nm to

1565 nm)

H High-quality optical eye pattern with low jitter

H High extinction ratio (≥12 dB)

H Polarization-controlled internal laser with +10 dBm output

Getting Started

2

OI1125 E/O Transmitter Instruction Manual

Options

Table 1 lists the power cord options that are available for your OI1125 E/O

Transmitter.

Table 1: Power cord options

Option Description

A1 European power cord

A2 UK power cord

A3 Australian power cord

A5 Swiss power cord

AC Chinese power cord

A99 No power cord

Table 2 lists the Tektronix service options. These options are modular, flexible,

and easy to order with your instrument. Designed to support tracking of

calibration to requirements of ISO9000 and to provide for extended repair

coverage, these options help fix your long-term maintenance costs and eliminate

unplanned expenditures.

Table 2: Service options

Option Description

D1 Provides the initial Test Data Report from the factory on delivery.

C3 Provides factory calibration certification on delivery, plus two more years of

calibration coverage. Throughout the coverage period, the instrument will be

calibrated according to its Recommended Calibration Interval.

D3 Provides test data on delivery plus a Test Data Report for every calibration

performed during three years of coverage (requires Option C3).

R3 Extends product repair warranty to a total of three years.

C5 Provides factory calibration certification on delivery, plus four more years of

calibration coverage. Throughout the coverage period, the instrument will be

calibrated according to its Recommended Calibration Interval.

D5 Provides test data on delivery plus a Test Data Report for every calibration

performed during five years of coverage (requires Option C5).

R5 Extends product repair warranty to a total of five years.

Tektronix Service Options are available at the time you order your instrument.

Contact your local Tektronix Sales Office for more information.

Getting Started

OI1125 E/O Transmitter Instruction Manual

3

Standard Accessories

Table 3 lists the standard accessories that come with the OI1125 E/O Transmitter.

Table 3: Standard accessories

Accessory Part number

US power cord 161-0066-00

PMF optical cable, FC/APC-PM, narrow key 174-4664-00

Optical cable, FC/APC-FC/PC, 2 M 174-4727-00

Low-loss SMA cable 015-0561-00

Laser Safety Interlock 131-7350-00

50 W terminator (preinstalled) 015-1022-01

FC/APC adapter (preinstalled) 119-5115-00

Optical connector cleaning kit 006-8217-00

Instruction manual 071-1052-XX

Certificate of Calibration –––

Optional Accessories

Table 4 lists the optional accessories that are recommended for the OI1125 E/O

Transmitter.

Table 4: Optional accessories

Item Part number

Side-By-Side Instrument Rack Adapter TVGF13

SC/APC UCI adapter 119-5116-00

ST/APC UCI adapter 119-5888-00

DIN 47256 UCI adapter 119-5887-00

PMF optical cable, FC/APC-PM, 2 m, narrow key 174-4725-00

Getting Started

4

OI1125 E/O Transmitter Instruction Manual

Installation

To properly install and power on the OI1125 E/O Transmitter, read this

procedure first to acquaint yourself with the instrument before performing the

procedure.

WARNING. To prevent eye injury, do not look directly into any optical output port

or cable attached to the port. Output power from the laser is Class IIIb, which

can be harmful to your eyes. The wavelength output from the OI1125 internal

laser is in the infrared band and is invisible to the human eye.

1. Be sure the operating environment is within the specifications listed in

Table 7 starting on page 21.

CAUTION. To prevent damage to the transmitter, provide proper ventilation. Do

not block the cabinet ventilation holes. Do not remove the cabinet feet; the feet

provide proper clearance for ventilation.

2. Leave space for cooling. Do this by verifying that the ventilation holes on

the sides, top, and bottom of the cabinet are free of any airflow obstructions.

Leave at least 5.1 cm (2 inches) free on each side.

3. Check that you have the proper electrical connections. The OI1125 E/O

Transmitter requires 100 to 240 VAC

RMS

"10%, 47 Hz to 63 Hz, ≤40 W.

4. Connect the proper power cord from the rear-panel power connector (see

Figure 7 on page 14) to the power system.

NOTE. For the internal laser to function, either the laser safety interlock or an

external control circuit must be connected to the remote connector on the rear

panel. See Using the Rear-Panel Remote Interface on page 15.

5. If you intend to use the internal laser as the optical source for the transmitter,

connect the laser safety interlock to the remote connector on the rear panel,

or connect your external control circuit to the connector.

NOTE. You need to make optical connections in the next step. Before making any

optical connection, clean your optical cables using the procedure on page 62.

6. If you are using the internal laser as the optical source for the transmitter,

connect the optical cable with FC/APC-PM connectors on both ends

(standard accessory, Tektronix part number 174-4664-00), between the

internal laser output and the modulator optical input. See Figure 1 on

page 1.

Getting Started

OI1125 E/O Transmitter Instruction Manual

5

CAUTION. To prolong the life of your optical connectors and cables, use care

when making optical connections. Refer to Connecting Signals on page 9 for

instructions on connecting optical signals.

If you are not using an optical connection, either on the transmitter, cable, or

associated optical equipment, always leave the protective dust cover on the

connector. The glass surface of the fiber optic core is easily contaminated by

airborne dust particles.

Treat all optical connectors as you would a camera lens or other precision

optical equipment.

7. If you are using an external laser source, connect it to the modulator Laser In

port on the front panel.

CAUTION. To prevent eye injury, do not look directly into the modulated output

port or cable attached to the port. The modulated output from the transmitter

may exceed Class I levels, depending on the power level of the external laser

source you use.

8. Leave the protective dust cover on the modulator output, or connect an

optical cable from the modulator output to your system or measurement

instrument.

To power on the OI1125 E/O Transmitter, first verify that the front-panel Laser

Enable keyswitch is in the OFF (locked) position and then push the rear-panel

power rocker switch to toggle it on. All LEDs will light briefly as the instrument

initializes.

If you are using the internal laser source, rotate the Laser Enable keyswitch

clockwise to the ON (unlocked) position. The ON LED and the Laser Output

Active LED light. The ON LED flashes if the laser safety interlock is not

installed.

WARNING. To prevent eye injury, do not look directly into any optical output port

or cable attached to the port. Output power from the laser is Class IIIb, which

can be harmful to your eyes. The wavelength output from the OI1125 internal

laser is in the infrared band and is invisible to the human eye.

To power off the OI1125 E/O Transmitter, first rotate the Laser Enable keyswitch

counterclockwise to the off (locked) position, and then push the rear-panel power

rocker switch to toggle it off.

Power on

Enable the Internal Laser

Power off

Getting Started

6

OI1125 E/O Transmitter Instruction Manual

Functional Check

To perform a functional check of the OI1125 E/O Transmitter, you must connect

a setup as shown in Figure 2. This setup measures the optical output of the

transmitter directly, requiring an oscilloscope or signal analyzer with optical

input capabilities. This is the method that is used in the Eye Pattern Test Matrix

in the Performance Verification on page 44.

The equipment required, besides the transmitter and the optical and electrical

cables supplied as standard accessories, is listed below.

H A pattern generator capable of producing data rates from 2.4 Gb/s to

12.50 Gb/s, with output levels in the range of 0.25-1.5 V

p-p

.

H An optical-input oscilloscope capable of measuring single-mode optical

signals in the 1550 nm band at data rates up to 12.50 Gb/s.

H A 50 W SMA cable to connect the pattern generator divided-clock output as

an oscilloscope trigger signal.

Alternatively, you can use an optical-to-electrical converter on the optical output

of the transmitter, so that you can use a conventional, electrical-input oscillo-

scope or analyzer to measure the transmitter output.

Pattern generator

OI1125

Laser in

(FC/APC)

Modulator out

(FC/APC)

CSA8000/TDS8000 w/80C01

Data

Clock

32

Trigger direct in

Modulator

data in

Laser out

(FC/APC)

PMF fiber

Single mode fiber

Low-loss SMA cable

(FC/PC)

SMA cable

Figure 2: Basic functional test setup

Follow the Displaying an Eye Pattern procedure on the next page to do a

functional check of the OI1125 E/O Transmitter. If you are unfamiliar with

making fiber optic connections, refer to Connecting Signals on page 9.

Getting Started

OI1125 E/O Transmitter Instruction Manual

7

To display an eye pattern, do the following:

1. Connect the test setup as shown in Figure 2, and power on the equipment.

2. Set the BERT bit rate to 9.953280 Gb/s.

3. Set the pattern to PRBS–31.

4. Disable the adjustable duty cycle.

5. Set the mark ratio to 1/2.

6. Set the trigger to 1/32 clock.

7. Set the output mode to AC.

8. Turn the data output on and set the data amplitude to 1.0 V

p–p

.

9. Enable the transmitter laser by turning the keyswitch clockwise (to the

unlocked position). The Laser On LED and Laser Output Active LED light.

10. On the oscilloscope, press Autoset, and then adjust the horizontal scale to

display an optical eye pattern (see Figure 3).

The oscilloscope displays an optical eye pattern as shown in Figure 3, indicating

that the transmitter is functioning correctly. The internal laser source, coupled to

the laser input port, is being modulated by the electrical data stream from the

BERT. The modulated optical output signal is displayed on the oscilloscope.

W W

Figure 3: Oscilloscope display of an eye pattern

Displaying an Eye Pattern

Getting Started

8

OI1125 E/O Transmitter Instruction Manual

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Tektronix OI1125 User manual

Tektronix OI1125 User manual

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