From the manufacturer:
Highlights
Extended calibration wavelengths for very high performance: 600 adjustable wavelengths for the OLA-54 and 400 adjustable wavelengths for the OLA-55.
An extremely long battery operation time of >1000 h.
Absolute and relative attenuation setting
Low minimum insertion loss due to new optical design.
Applications
Emulate fiber loss for testing system dynamics.
OLA-55 for testing up to 40 Gbps systems together with bit error rate testing (BERT).
For system installation and maintenance of multimode fiber (OLA-54) and singlemode fiber (OLA-55).
Key Features
The SMARTWheel for precise and fast manual setting
The SMARTStar graphical user interface for fast, easy, and straightforward operation.
The SMARTEnergy power supply management system.
A USB port for remote operation.
Traceable measurements to NIST/PTB standards for confidence in accuracy.
A robust, shock-proof, and splash-proof design for field operation.
One-handed operation in the field.
Quick start operation, requiring no warm-up time and reducing testing time.
Specifications
Adjustable wavelength range 1260 to 1650 nm in 1nm increments
Fiber type 9/125 µm
Calibrated wavelengths 1300nm, 1310 nm, 1550 nm, 1625 nm
Display range 2.0 to 60 dB
Minimum insertion loss <2.0 dB
Linearity ± 0.2
Repeatability of attenuation setting ± 0.1 dB
Total attenuation accuracy ± 0.8 dB
Setting type Continuous over the entire range
Function Bi-directional
Displayed value Absolute or relative attenuation value
Max. permitted level +23 dBm