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LUNA OBR 4600 Reflectometer – Lab Test

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Manufacturer: Luna Technologies

The LUNA OBR 4600 is the industrys only ultra-high resolution OTDR with Raleigh backscatter-level sensitivity (better than -130 dB) designed for precision analysis of fiber optic components optical modules and optical sub-assemblies.

  • Easily locate, identify and troubleshoot macro-bends, splices, connectors and breaks
  • Locate Insertion Loss points at every point in the network or assembly – eliminate cut-back
  • Look inside components to evaluate each interface for RL and IL
  • Measure 30 m with 10 μm resolution in less than 7 seconds
  • Continuously measure a 1 m segment at up to 3 Hz
  • Test and troubleshoot short-run networks (< 2 km)
  • Automate pass/fail verification of fiber assemblies
  • Monitor distributed temperature and strain profiles along network or inside a component or module

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Luna Technologies' Distributed Temperature and Strain Sensing Software, when combined with the Optical Backscatter Reflectometer™ (OBR), transforms your standard telecom-grade fiber into a high spatial-resolution strain and temperature sensor.

The OBR uses swept wavelength interferometry (SWI) to measure the Rayleigh backscatter as a function of length in optical fiber with high spatial resolution. An external stimulus (like a strain or temperature change) causes temporal and spectral shifts in the local Rayleigh backscatter pattern.

The OBR measures these shifts and scales them to give a distributed temperature or strain measurement. The SWI approach enables robust and practical distributed temperature and strain measurements in standard fiber with centimeter-scale spatial resolution up to 70 meters of fiber with strain and temperature resolution as fine as 1 µstrain and 0.1 °C.

  • Use standard telecom-grade fiber. No more expensive specialty fibres needed for measurements.
  • Highly distributed fiber sensing for strain and temperature
  • Very high spatial resolution: down to 2 mm
  • Centimeter resolution up to 70 meters
  • +/- 0.1°C , +/- 1µ strain resolution at 1 cm
  • High speed – five second acquisition times at high resolution
Short range communications networks (local intranet, fiber to the home, shipboard and aircraft data bus):
  • Find high operational temperatures that degrade lifetime or performance of components
  • Determine if strain induced during installation exceeds safe threshold
  • Look for long-term strain concentrations that threaten fiber integrity

Structural monitoring for naval, aerospace and civil structures:

  • Conformal deformation and shape sensing>
  • Composite damage assessment
  • Bonded joint integrity monitoring

Temperature profile monitoring:

  • Fuel cells
  • Concrete cure temperature monitoring in large structures
  • Industrial chemical process monitoring

Pipeline shift and leak detection

Electrical power line sag and temperature monitoring


Maximum Device Length:        
   Standard Mode 30 or 70 meters
   Long Range Mode12 2000 meters
Spatial Resolution (two-point)1:        
    10 μm over 30 meters
    20 μm over 70 meters
    1 mm over 2 km
Dead Zone:        
    Equals 2-pt spatial resolution
Wavelength Range2:        
    1265-1335 or 1525-1610 nm
   Resolution (max) 0.02 pm


Integrated Return Loss Characteristics:        
   Dynamic Range4 70 dB
   Total Range 0 to -125 dB
   Sensitivity -130 dB
   Resolution5  ±0.05 dB
   Accuracy6  ±0.10 dB
Integrated Insertion Loss Characteristics:        
   Dynamic Range6 18


   Resolution5  ±0.05 dB
   Accuracy6  ±0.10 dB
Group Delay:        
   Accuracy 1.0  ps
Distributed Sensing7,12,13:        
   Spatial Resolution8  ±1.0 cm 
    Temperature Resolution9  ±0.10
    Strain Resolution9  ±1.0 μstrain
Measurement Timing10: Standard Fast11 Spot Scan11  
   5nm scan time 1.6 0.3 s
   Time vs. wavelength range 2.1 s+0.14 s/nm  1.3 s+0.06 s/nm 0.15 s+0.02 s /nm  -
   Long Range (2km) Scan Time 20 s


Specifications are for single-mode operation.
For multimode operation, specifications are nominal.

1 Over entire length range.
2 Ranges are nominal.
3 Accuracy maintained by an internal NIST-traceable HCN gas cell.
4 For the 2000 m option, return loss dynamic range is 60 dB.
5 With integration width of 0.5 m
6 The insertion loss dynamic range is the one-way loss that can be suffered before the scatter level of standard SMF (~ -100 dB/mm) is lower than the noise floor (~ -118 dB/mm).
7 Distributed sensing uses Rayleigh spectral shift method and is relative to reference scan.
8 Spatial resolutions listed are ideal to get the temperature and strain resolutions listed; they are not minimums or maximums.
9 Temperature and strain resolutions are calculated from spectral shift of Rayleigh scatter using 1 GHz = 0.8 C= 6.58 μStrain. [Othonos and K. Kalli, Fiber Bragg Gratings (Artech House, Boston, 1999)].
10 Combined scan and analysis time in high-resolution mode. Times are for 30 m scan mode.
11 Times are with laser tuning speed set at 100 nm/s.
12 Extended range mode and distributed sensing are upgrade options
13 Maximum standard sensing length is 70m. Limited sensing is available in extended range mode. 


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