THORLABS EVOA1550F Manuel utilisateur

EVOA1550F & EVOA1550A

Electronic Variable Optical

Attenuators

User Guide

Electronic Variable Optical Attenuators

TTN095737-D02

Table of Contents

Chapter 1Warning Symbol Definitions.....................................2

Chapter 2Safety ..........................................................................3

Chapter 3Introduction & Quick Start ........................................ 4

3.1.Introduction............................................................4

3.2.Features..................................................................4

3.3.FiberInterface&UtilityPanels................................5

3.4.QuickStartGuide....................................................6

Chapter 4Operating Instructions & Details..............................7

4.1.Overview.................................................................7

4.2.Powering&ChargingtheUnit.................................7

4.3.FiberConnections....................................................8

4.4.WavelengthSelection&Calibration........................8

4.5.AttenuationControl.................................................9

4.6.DigitalOutputPowerDisplay..................................9

4.7.ModulationInput&MonitorOutputConnections....9

4.8.PowerLock............................................................10

Chapter 5Maintenance & Repair .............................................11

Chapter 6Specifications...........................................................12

6.1.GeneralSpecifications...........................................12

6.2.MechanicalDrawings............................................13

Chapter 7Regulatory ................................................................14

Chapter 8Certificate of Compliance .......................................15

Chapter 9Thorlabs Worldwide Contacts................................16

Electronic Variable Optical Attenuators Chapter 1: Warning Symbol Definitions

Page 2 TTN095737-D02

Chapter 1 Warning Symbol Definitions

Below is a list of warning symbols you may encounter in this manual or on

your device.

Symbol Description

Direct Current

Alternating Current

Both Direct and Alternating Current

Earth Ground Terminal

Protective Conductor Terminal

Frame or Chassis Terminal

Equipotentiality

On (Supply)

Off (Supply)

In Position of a Bi-Stable Push Control

Out Position of a Bi-Stable Push Control

Caution: Risk of Electric Shock

Caution: Hot Surface

Caution: Risk of Danger

Warning: Laser Radiation

Caution: Spinning Blades May Cause Harm

Caution: ESD Sensitive Components

Electronic Variable Optical Attenuators Chapter 2: Safety

Rev B, September 5, 2017 Page 3

Chapter 2 Safety

CAUTION

The following statement applies to the products covered in this manual,

unless otherwise specified herein. The statement for other products will

appear in the accompanying documentation. Inputs and outputs must only

be connected with shielded connection cables.

Only with written consent from Thorlabs may changes to single

components be carried out or components not supplied by Thorlabs be

used.

This product has been tested and found to comply with the limits

according to IEC 61326-1 for using connection cables shorter than 3 meters

(9.8 feet).

This equipment has been tested and found to comply with the limits for a

Class B digital device, pursuant to Part 15 of the FCC Rules, and meets all

requirements of the Canadian Interference Causing Equipment Standard

ICES-003 for digital apparatus. These limits are designed to provide

reasonable protection against harmful interference in a residential

installation. This equipment generates, uses, and can radiate radio

frequency energy and, if not installed and used in accordance with the

instructions, may cause harmful interference to radio communications.

However, there is no guarantee that interference will not occur in a

particular installation.

Thorlabs is not responsible for any radio television interference caused by

modifications of this equipment or the substitution or attachment of

connecting cables and equipment other than those specified by Thorlabs.

The correction of interference caused by such unauthorized modification,

substitution or attachment will be the responsibility of the user. The use of

shielded I/O cables is required when connecting this equipment to any and

all optional peripheral or host devices. Failure to do so may violate FCC

and ICES rules.

The safety of any system incorporating the equipment is the responsibility

of the assembler of the system.

If equipment is used in a manner not specified by the manufacturer, the

protection provided by the equipment may be impaired.

This instrument should be kept clear of environments where liquid spills or

condensing moisture are likely. It is not water resistant. To avoid damage

to the instrument, do not expose it to spray, liquids, or solvents.

The components inside this instrument are ESD sensitive. Take all

appropriate precautions to discharge personnel and equipment before

making any electrical connections to the unit.

Electronic Variable Optical Attenuators Chapter 3: Introduction & Quick Start

Page 4 TTN095737-D02

Figure 1 Front View

Chapter 3 Introduction & Quick Start

3.1. Introduction

The EVOA1550F and EVOA1550A are electronically controlled variable

optical attenuators (EVOAs) for single mode fiber applications. The control

knob allows analog adjustment of the attenuation, while the digital meter

reports the actual output power. A key feature is the Power Lock function,

which allows the user to lock the output power level by using the VOA as a

power stabilizer.

These EVOAs are designed for use with standard single mode fiber (e.g.

SMF-28e+) and accept either FC/PC connectors (Item # EVOA1550F) or

FC/APC connectors (Item # EVOA1550A). The wavelength selector switch

accesses calibrated settings for 1310 nm and 1550 nm, and also provides a

position which the user can calibrate for any wavelength from 1250 nm to

1625 nm.

The unit is battery powered and can last for hundreds of hours on a single

charge. Charging can be done through the utility side panel with either the

included external power supply or a USB mini-B cable (not included). The side

panel also provides an external modulation input and a power monitoring

output via SMA connectors.

3.2. Features

Digital Display

Wavelength

Selector: 1310 nm,

1550 nm, or Use

Bi-Stable Lock

Button

Fiber Bulkhead (2 Places)

2.0 mm Narrow Key

Label Indicates PC o

APC Compatibility

Utility

Panel

Power Adjustment

Knob

Rocker

Power

Switch

Electronic Variable Optical Attenuators Chapter 3: Introduction & Quick Start

Rev B, September 5, 2017 Page 5

Figure 3 Utility Panel (Side View)

3.3. Fiber Interface & Utility Panels

Rocker Power Switch

2.1 mm Charging Jack

for Included Power

Supply

USB Mini-B

Charging Jack

Charging Indicators

Green: Fully Charged

Yellow: Charging

SMA Modulation

ut SMA Monitor

Output

User Wavelength

Calibration Pot

Output

Bulkhead

Input

Bulkhead

Connector Label

Figure 2 Fiber Interface Panel (Top View)

Electronic Variable Optical Attenuators Chapter 3: Introduction & Quick Start

Page 6 TTN095737-D02

3.4. Quick Start Guide

ESD CAUTION

The components inside these products are sensitive to electrostatic

discharge (ESD). Take all appropriate precautions, including grounding

personnel and equipment, before making any connections to the unit.

In the box, you should find the EVOA and its power supply with a 2.1 mm

coaxial plug that matches the power input jack on the side of the unit.

Follow these simple instructions to get started as quickly as possible:

1. Make sure the unit is sufficiently charged. It is shipped about 50%

charged. Using the included power supply, it typically takes 5 hours

to reach a full charge (starting from the “Low Battery” indicator) that

lasts for hundreds of hours.

2. Connect input and output fiber patch cables (single mode only)

to the bulkheads. Make sure they are clean. We recommend the

FCC-7020 Fiber Connector Cleaner and the FBC1 Bulkhead Cleaner

for fiber tips and bulkheads, respectively.

3. Select the desired wavelength with the selector knob. The unit is

factory calibrated for both 1310 nm and 1550 nm. Other wavelengths

in the 1250 - 1625 nm range can be user calibrated.

4. Turn the rocker power switch ON.

5. Adjust the attenuation to get the desired output power on the

digital display.

6. Press the Lock button to hold the power setting (optional). A

green LED will blink to indicate a successful lock. A red LED will blink

if the unit cannot find a lock.

7. Release the Lock button to make any further adjustments.

Electronic Variable Optical Attenuators Chapter 4: Operating Instructions & Details

Rev B, September 5, 2017 Page 7

Chapter 4 Operating Instructions & Details

4.1. Overview

This chapter provides deeper details about the EVOA and its operation. To

get started with using the EVOA, refer instead to the Quick Start Guide

(Section 3.4).

The block diagram below (Figure 4) depicts the unit’s basic architecture. The

EVOA is controlled by analog electronics. The front panel provides a power

adjustment knob, a digital output power display, and Power Lock capability.

Figure 4 Basic Architecture of EVOA

Starting from the left of Figure 4: The light in the input fiber is coupled directly

into a MEMS-based variable optical attenuator (VOA), and the attenuated light

is sampled by a low-percentage tap. The tap output is sent into a photodiode

whose signal is used by the digital output power display, the Power Lock

control loop, and the SMA monitor output. The attenuation value can be

controlled by the manual power adjustment knob, the Power Lock control loop,

or the SMA modulation input.

When the power is switched off, the EVOA defaults to a mid-range attenuation

whose value is independent of the knob position.

4.2. Powering & Charging the Unit

The EVOA is powered by an internal rechargeable Li-ion battery which

provides approximately 300 hours of continuous operation on a full charge.

The battery’s internal circuits prevent full discharge after the Low Battery

indicator appears on the display. To charge the unit, use either the 2.1 mm

coaxial power cord that is included with the EVOA, or use a USB mini-B cable

and charger (not included). If the device continues to be used while the Low

Battery indicator is active, it will eventually be shut down by the battery’s safety

circuits.

The 2.1 mm coaxial power cord will provide 1 A of charging current and hence

the fastest charging time. In contrast, the charging current provided by a USB

cable is up to 500 mA, as determined by the power source. For example, some

Monitor

Output

Fiber

Modulation

Input

Fiber

Manual

Control

Digital

Display

Photodiode

Power Lock

Control Loop

TapVOA

Electronic Variable Optical Attenuators Chapter 4: Operating Instructions & Details

Page 8 TTN095737-D02

USB chargers (e.g., for phones or tablets) will provide a maximum of 500 mA,

while others (e.g., those on a PC) will be as low as 100 mA. All charging rates

are sufficient to power the device while simultaneously charging the battery,

but charging will take longer at lower currents.

Two LEDs on the side utility panel indicate the charging status of the unit. A

yellow LED indicates that charging is in progress, while a green LED indicates

that charging is complete. If both LEDs are lit, there is a battery fault. Please

contact Thorlabs’ tech support (techsupport@thorlabs.com) if this occurs.

When the power is switched on, the attenuation will be set at the value

determined by the position of the manual power adjustment knob. If this value

is not known, we recommend rotating it completely counterclockwise before

switching the power on. This will ensure maximum attenuation.

When the power is switched off, a voltage remains on the internal VOA, such

that there will still be mid-range attenuation even when the power is off. This

is a precautionary feature that uses virtually no current, as the EVOA is an

ultra-low current device. This feature does not drain the battery meaningfully

faster than the battery itself would lose charge otherwise.

4.3. Fiber Connections

The fiber patch cable input and output bulkheads (see Figure 2) are both FC

style. They may be ordered with PC- or APC-style internal connectors:

Item # EVOA1550F has FC/PC connectors.

Item # EVOA1550A has FC/APC connectors.

The fiber patch cable and connectors should be cleaned whenever a

connection is made. We recommend the FCC-7020 Fiber Connector Cleaner

and the FBC1 Bulkhead Cleaner for fiber tips and bulkheads, respectively.

See Chapter 5, Maintenance & Repair, for guidance.

4.4. Wavelength Selection & Calibration

The digital output power display gives the calibrated output power at the

wavelength indicated by the selector knob. The first and second knob

positions are for 1310 nm and 1510 nm, while the third position (labeled

“USER”) can be calibrated by the user for any wavelength in the 1250 - 1625

nm operating range. The user calibration trimpot is located on the side utility

panel.

To calibrate the USER position on the knob, the following tools are required:

A single mode laser source at the desired wavelength,

An accurate power meter for that wavelength,

Input and output fiber patch cables, and

A small flathead screwdriver to adjust the trimpot.

Electronic Variable Optical Attenuators Chapter 4: Operating Instructions & Details

Rev B, September 5, 2017 Page 9

Follow these simple steps to calibrate the USER position:

1. Switch the wavelength selector knob to the USER position.

2. Send an optical input into the input bulkhead at the wavelength of

interest. We recommend an input power of a few mW for the best

accuracy.

3. Rotate the manual power adjustment knob completely clockwise to

set it at minimum attenuation.

4. Attach the power meter to the output fiber patch cable. (Make sure

the power meter is set to the correct wavelength.)

5. Adjust the user calibration trimpot so that the power value on the

digital display agrees with the value shown on the power meter.

6. At this point, we recommend making a note of the user wavelength

and placing a piece of tape over the trimpot to prevent accidental

adjustments.

4.5. Attenuation Control

The user can control the attenuation using two analog methods.

The first and simplest method is to rotate the manual power adjustment knob

on the front panel (see Figure 1). This knob provides the full range of

attenuation. Rotating it clockwise increases the output power, while rotating it

counterclockwise decreases the output power. The knob has ten full rotations.

The second method is to apply a voltage to the SMA modulation input on the

side utility panel (see Figure 3). This input allows for modulation from DC to 1

kHz. See Section 4.7, Modulation Input & Monitor Output Connections, for

details.

4.6. Digital Output Power Display

The digital output power display uses the signal from the tap output (see

Section 4.1) to calculate the calibrated output power before the tip, in mW, at

1310 nm, 1510 nm, or the user wavelength. The display offers 4.5 digits of

resolution (the leftmost digit has a maximum value of 1). The display range

will auto-scale for low or high input power, and changes over at about 15 mW.

The digital display also has a Low Battery warning that indicates when the

battery needs to be charged. The warning appears while there is still sufficient

charge remaining for the Li-ion battery not to degrade.

4.7. Modulation Input & Monitor Output Connections

The side utility panel (see Figure 3) provides two SMA connectors: an input

for analog modulation and an output for power monitoring.

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