MDL 002
User Manual: MDL-002
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INSTRUMENTS Motorized Variable Optical Delay Line – VariDelay™ II General Photonics’ motorized variable optical delay line provides precision optical path length adjustment of up to 560 ps, single-pass. Driven by a DC motor with an integrated encoder, the MDL-002 has a delay resolution of less than 0.3µm (1 fs), and an extremely low backlash of less than 8 fs. In addition, its advanced motion design guarantees longevity for long-term continuous operation. Low insertion loss and high reliability make this device ideal for integration in optical coherence tomography (OCT) systems, network equipment and test instruments for precision optical path length control or timing alignment. The MDL002 is available in three configurations: 1) an integrated unit for use as a bench-top instrument for laboratory applications, 2) with the optical head and control unit separated for easy incorporation into other equipment, and 3) an OEM version with a miniature controller board. All three versions can be remote controlled by a PC or a micro-processor through an RS-232 interface. The delay line is available with either single mode or PM fiber pigtails. OCT Products Modules INSTRUMENTS Timing/Delay Modules Specifications: PDL SM: 1260 to 1650 nm PM or double-pass: 1310 ± 50 or 1550 ± 50 nm 0 – 330 ps (single-pass model) 0 – 560 ps (single-pass model) 0 – 1120 ps (double-pass model) 0.3 µm or 1 fs per encoder count (single-pass) 0.6 µm or 2 fs per encoder count (double-pass) ±0.01 ps or ±3 µm (single-pass) ±0.02 ps or ±6 µm (double-pass) ±0.01 ps or ±3 µm (single-pass) ±0.02 ps or ±6 µm (double-pass) 1.0 dB nominal (single-pass) 1.5 dB nominal (double-pass) ±0.3 dB over entire range for 330 ps models ±0.5 dB over entire range for 560 ps model ±0.7 dB over entire range for 1120 ps model 0.1 dB max for single-mode fiber Return Loss 50 dB Extinction Ratio > 18 dB for PM model Optical Damage Power Threshold 300 mW Power Supply 12 VDC / 1A max. Control Mode Panel keypad and RS-232 interface Display 2 x 16 character LCD Operating Temperature 0 °C to 40 °C Storage Temperature -20 °C to 60 °C Fiber Type Dimensions (Control Unit/Integrated Version) Dimensions (Mini Controller Board) SMF-28 or PM Panda fiber 330 ps model: 1.6” (H) × 4” (W) × 7” (L) 560 ps or 1120 ps models: 1.6” (H) × 4.4” (W) × 9” (L) 1 Operating Wavelength Optical Delay Range2 Application Guide Accessories Special Polarization Components Optical Delay Resolution Optical Delay Accuracy Optical Delay Repeatability Insertion Loss Insertion Loss Variation Dimensions (Optical Head) Features: . Compact . High resolution . Low backlash . Low insertion loss . High stability . Highest delay to length ratio . Long delay: more than 560 ps Applications: . Optical Coherence Tomography (OCT) . Optical Fourier spectrum analysis . Optical interferometry . Delay generation and measurement . Optical time division multiplexing (OTDM) . Fiber sensors 2.56” (L) × 2.56” (W) × 0.85” (H) 330 ps model: 0.7” (H) x 1.46” (W) × 5.20” (L) 560 ps or 1120 ps models: 0.7” (H) x 1.46” (W) x 6.18” (L) Tech Info: FAQ: FAQS Notes: Values in table are valid over a 1310 ± 50 or 1550 ± 50nm range for a device without connectors. 1. Other wavelengths, such as 1064nm, also available. 2. The 1120 ps model is a double-pass device. 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. -60- General P h ot oni cs Corpor a tio n 9 0 9 .5 9 0 .5 4 7 3 w w w .g e n e r a lp ho to n ic s .c o m p. 215 p. 227 INSTRUMENTS INSTRUMENTS Timing/Delay Modules Motorized Variable Optical Delay Line – VariDelay™ II OCT Products Modules Typical Performance Data: Figure 1. Insertion loss vs. optical delay. Optical head: Special Polarization Components Dimensions: (Representative drawings: 560 ps version) Integrated version/control unit — — Configuration: Wavelength: I = integrated 13 = 1310 nm D = Remote head/ 15 = 1550 nm standard controller 35 = 1310 & 1550 nm O = Remote head/ mini controller board — Delay Range: 33 = 330 ps 56 = 560 ps 11 = 1120 ps — Connector Type: FC/PC, FC/APC SC/PC, SC/APC or NC = no connectors Others specify SS = SMF-28 PP = PM Panda Application Guide MDL — 002 — Accessories Ordering Information: FAQS Note: 1. For SM pigtails, the default configuration is 3mm jacketed. For PM pigtails, the default configuration is 900µm loose tube jacketed. 2. Wavelength: 35 option (dual window 1310/1550nm) is available only for SM single-pass devices (330 and 560 ps). PM or double-pass devices are single-window (1310 or 1550nm) only. General P h ot oni cs Corpor a tio n 9 0 9 .5 9 0 .5 4 7 3 w w w .g e n e r a lp ho to n ic s .c o m -61-
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