Electronically Variable Optical
Attenuators
EVOA Series
Product Description
Oplink’s electronically variable optical attenuator (EVOA) is a high performance
opto-mechanical device. EVOA operates by moving an obstructing element into
the optical beam and the position of the obstructing element can be adjusted by
an integrated, electronically controlled step motor, resulting in fine tuning of at-
tenuation.
Oplink’s EVOA features a large dynamic attenuation range of >30dB and an excel-
lent optical performance over C- or L-band. Its latching operation retains recent
attenuation setting upon removal of drive voltage. Applications include pre-em-
phasis attenuation, detector saturation control, in-line power equalization and
amplifier power control applications. Also, it can be used to extend the dynamic
range of optical measurement instruments.
Oplink’s EVOA is designed to withstand the diverse environmental conditions and
compliance to the Telcordia standard GR-1221.
Oplink can provide customized designs to meet specialized feature applications.
Also, Oplink offers modular assemblies that integrate other components to form
a full function module or subsystem.
Performance Specificationns
Parameter
Min
[1]
Typical
Max
Unit
Operating wavelength range
Insertion Loss
Attenuation range
Temperature dependence of attenuation
Wavelength depen-
dence of attenuation
Polarization depen-
dence of attenuation
PMD
Return Loss
Resolution
Repeatability
Back lash
Response speed
Optical power
Operating Temperature
Storage Temperature
Fiber type
POT resistance
Package Dimensions
Notes:
1) Excluding connectors.
2) Relative to 23°C.
[3]
[1]
[2]
1525 ~ 1570 or 1570 ~1610
1.0
0
30
0.15
0.2
0.3
0.15
0.2
0.1
40
0.15
0.2
0.3
0.2
100
-5 to +70
-40 to +85
SMF-28
9
10
11
nm
dB
dB
dB
dB
dB
ps
dB
dB
dB
dB
sec
mW
°C
°C
KΩ
mm
Features
Operates over C or L Band
Low Insertion Loss and PDL
Latching Capability
PCB Mountable
0~15dB Attenuation
15~30dB attenuation
0 to15 dB
> 15 dB
Applications
Pre-emphasis Attenuation
Detector Input Power Control
In-line Power Equalization
Gain Control in Optical Amplifiers
On/Off Switch
Instrumentation, Testing and
Measurement
P2: 50.0 (L) ×25.0 (W) × 12.0 (H
P3: 45.0 (L) ×18.0 (W) × 12.0 (H)
3) At 3 dB attenuation change.
R09.20090302
OPLINK [ OPLINK COMMUNICATIONS INC. ]
