Miniature Variable Optical Delay Line
The VDL-002 is a miniaturized variable optical delay line designed specifically for OEM applications. With a delay range of up to 250 ps, this device is a superior replacement for the variable RF phase shifters inadequately adapted from the RF/wireless field for fiber optic communications. It is especially useful in coherent detection systems for adjusting phase or delay differences between signals. The VDL-002 eliminates the VSWR problems of RF phase shifters for high frequency and broadband signals, especially at 40 and 100Gbps. A single device can be used for any data rate, simplifying inventory management. With a footprint of only 0.72” × 1.46” × 2.2” for a delay range of 100 ps, the device can be conveniently integrated into network modules, test instruments, and OCT equipment for precision optical path length control or timing alignment. An internal mirror can be installed to cause light to double pass the device, doubling the delay range. The unique design makes hermetically sealed packaging possible and enables Telcordia qualification when required. Finally, a locking mechanism is provided for locking the delay at a permanent position. The VDL-002 generally comes with single mode or PM fiber pigtails per customer requirement.
Applications:
Coherent detection systems
Optical time division multiplexing (OTDM)
Optical coherence tomography (OCT)
Optical interferometry
Optical Fourier spectrum analysis
Fiber sensors
Unique Features:
Compact size
High resolution
Low insertion loss
High stability
Longevity
Specifications
Operating Wavelength2
SM: 840 ± 50nm, 1060 ±50 nm, 1260-1650 nm
PM: 840, 1060, 1310 or 1550 nm ± 50 nm
Optical Delay Range3
0 ~ 100 ps (3 cm) continuous for 100 ps model
0 ~ 250 ps (7.5 cm) continuous for 250 ps model
Internal mirror option for doubling the range
Delay Stability
0.15 ps
Zero Point Delay Offset4
180 ps
Insertion Loss1
1.0 dB nominal
Insertion Loss Variation1
± 0.3 dB over entire range
PDL1
0.1 dB (SM model)
Return Loss1
55 dB
Extinction Ratio
> 18 dB for PM model
Optical Damage Power Threshold
300 mW
Operating Temperature
−15°C to 50°C
Storage Temperature
−40°C to 60°C
Fiber Type
840nm: HI780 or PM Panda
1060nm: HI1060 or PM Panda
1310 and/or 1550nm: SMF-28 or PM Panda
Position Locking
Included
Dimensions
2.2” (L) × 1.46” (W) × 0.72” (H) for 100 ps model
3.15” (L) × 1.46” (W) × 0.72” (H) for 250 ps model
Notes:
1. Specifications in table apply for a single-pass device without connectors, measured over 1310 ± 50 nm or 1550 ± 50 nm at 23±5°. The output pigtail can also be replaced with a Faraday mirror to create a double pass device with a total range of 200 or 500 ps, respectively. Some specifications will change for other wavelengths or for double pass devices.
2. Other wavelengths available upon request. Contact General Photonics for details.
3. Double pass device has 200 ps or 500 ps delay range. Since input and output signals travel on the same pigtail, a circulator or PBS may be necessary to separate input and output signals for some applications.
4. Absolute delay at 0 ps setting measured to the edge of the enclosure (excluding caps, boots, and pigtails).
Dimensions
Ordering Information:
Configuration Notes:
1. Wavelength: 35 option (dual window 1310/1550nm) is available only for SM single-pass devices. PM or double-pass devices are single-window (e.g. 1310 or 1550nm) only.
2. Double-pass only available with SM fiber.
3. Double-pass not available for 840 or 1060nm.
商品属性 [波长] SM: 840 ± 50nm, 1060 ±50 nm, 1260-1650 nm PM: 840, 1060, 1310 or 1550 nm ± 50 nm [光纤类型] 840nm: HI780 or PM Panda 1060nm: HI1060 or PM Panda 1310 and/or 1550nm: SMF-28 or PM Panda