Name: VariDelay VDL-002 Miniature Manual Variable Optical Delay Line
Brand: Luna
SKU: VDL-002

Overview

The VDL-002 is a miniature, fiber-coupled variable optical delay line in which the delay adjustment path is in free space. The delay is set by manually turning a screw on one end of the device, and the position is read from a scale on the side. A locking screw holds the delay at the chosen position. The device is housed in a sturdy, water-resistant enclosure.

The VDL-002 is intended for OEM applications that need short-range optical path adjustment to find an optimal position and then lock it in place. Typical uses include optical coherence tomography (OCT) systems, test equipment and network modules, where it provides optical path length control or timing alignment. In coherent detection systems it can be used to adjust phase or delay differences between signals.

The delay line is available with single mode or PM fiber pigtails. Single-pass versions offer 100 ps or 250 ps of delay range. An internal mirror can be installed so that light passes through the device twice, doubling the delay range to 200 ps or 500 ps; in a double-pass device the input and output signals travel on the same pigtail, so a circulator or PBS may be needed to separate them in some applications.

Key Features

Compact size
Sturdy, water-resistant enclosure
Position locking mechanism
Manual delay adjustment by screw with position scale on the side
Single mode or PM fiber pigtails
Internal mirror option for doubling the delay range
High resolution
Low insertion loss
High stability

Specifications

Optical

Center wavelengths (λc)	SM, single pass: 1310/1550 dual window, 1060, or 840nm; SM, double pass: 1310 or 1550nm; PM, single pass: 1310, 1550, 1060, or 840nm
Operating wavelength	SM: 840 ± 50nm, 1060 ±50 nm, 1260-1650 nm; PM: 840, 1060, 1310 or 1550 nm ± 50 nm Other wavelengths available upon request
Wavelength range	λc ±50nm
Optical delay range	Single-pass: 100 ps (3 cm) or 250 ps (7.5 cm)
Optical delay range Double pass	Double-pass: 200 ps or 500 ps Input and output travel on the same pigtail; a circulator or PBS may be necessary to separate signals
Delay stability	0.15 ps
Zero point delay offset	180 ps Absolute delay at 0 ps setting measured to the edge of the enclosure (excluding caps, boots, and pigtails)
Insertion loss	1.0 dB nominal Single pass device without connectors, at 23±5°C
Insertion loss variation	±0.3 dB over entire range Single pass device without connectors, at 23±5°C
Return loss	55 dB Single pass device without connectors, at 23±5°C
Extinction ratio PM	> 18 dB For PM model
Optical damage power threshold	300 mW

Fiber

Fiber type (1060 nm)	HI1060 or PM Panda
Fiber type (1310 and/or 1550 nm)	SMF-28 or PM Panda
Connector type	FC/PC, FC/APC Others specify

Mechanical

Position locking	Included

Environmental

Operating temperature	-15 to 50 °C
Storage temperature	-40 to 60 °C

Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.

Options & Accessories

Option	Description
10	Delay range: 100 ps
25	Delay range: 250 ps
SS	Fiber type: SM
PP	Fiber type: PM Panda — Double pass only available with SM fiber
S	Pass: single
D	Pass: double — Double-pass not available for 840 or 1060nm
84	Wavelength: 840 nm
10	Wavelength: 1060 nm
13	Wavelength: 1310 nm
15	Wavelength: 1550 nm
35	Wavelength: 1310 & 1550 nm — Dual window 1310/1550nm, available only for SM single-pass devices