THORLABS EVOA1550F User Manual page 4

Electronic Variable Optical Attenuators
Chapter 1 Introduction
1.1 Intended Use
The EVOA1550F and EVOA1550A are electronically controlled variable optical attenuators intended for use in a
laboratory environment. These products may only be used in accordance with the instructions described in this
manual. Any other use will invalidate the warranty.
1.2 Explanation of Safety Warnings
Indicates information considered important, but not hazard-related, such as possible
damage to the product.
ESD Component Caution
The CE/UKCA markings on the product are the manufacturer's declaration that the product
complies with the essential requirements of the relevant European health, safety, and
environmental protection legislation.
The wheelie bin symbol on the product, the accessories or packaging indicates that this device must not
be treated as unsorted municipal waste but must be collected separately.
1.3 Description
The EVOA1550F and EVOA1550A are electronically controlled variable optical attenuators (EVOAs) designed 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.
Optical fibers coupled to these EVOAs should be single mode over the operating range of the EVOA (e.g. SMF-28-
J9), and either FC/PC connectors (Item # EVOA1550F) or FC/APC connectors (Item # EVOA1550A) are accepted.
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.
Rev. C, December 31, 2024
Chapter 1: Introduction
Page 1