Variable Delay Lines A Variable Delay Line is a modified FiberBench that is actually a stainless steel precision translation stage on which are mounted two FiberPorts. Used in applications requiring a variable optical path length, the VDL Variable Delay Line has a precision z-axis translation slide with micrometer actuator. With the VDL it is possible to control with high resolution the air-path length of the collimated beam between the FiberPorts.
In order that the system retain the inherent stability of all FiberBenches, the OFR VDL Variable Delay Line is designed to eliminate backlash and cross-talk between axes, and to repeat within 1 µm (~3.3 f-s) anywhere over its travel range.

Part
Number

Air Gap
Change

Total
Delay (ps)

Fiber
In/Out

Insertion
Loss

VDL-FFB-25-P-λ-X or X/Y

25 mm

0 - 83ps

PM

0.5 - 1.5 dB

VDL-FFB-25-S-λ-X or X/Y

25 mm

0 - 83ps

SM

0.5 - 1.5 dB

VDL-FFB-13-P-λ-X or X/Y

13 mm

0 - 43ps

PM

0.5 - 1.5 dB

VDL-FFB-13-S-λ-X or X/Y

13 mm

0 - 43ps

SM

0.5 - 1.5 dB

Note: 1 µm ≈3.3 p-s delay
When ordering, specify options as follows:
λ: Wavelength in nm
X: Connector Interface (FC/APC)
X/Y: Permanent Pigtail one end, connector other end
For example VDL-FFB-13-S-1550-X