EO E-field Sensor – Ring 2024-06-04T13:49:10+00:00

EO E-field Micro-Ring Sensor 

Partow E-field Micro-Ring (MR) sensor products uses electro-optic micro-ring resonators made from lithium niobate thin films for sensing of electric fields. The sensors can achieve very high spatial resolution and can operated form near DC frequencies up to 2.5 GHz. The sensor is made from all dielectric materials. Hence it does not perturb measurand electric field. Also, since fiber optic cables are used these sensors are immune to electromagnetic interference and can be used in highly noisy environment. The readout system is based on a tunable laser and a detector. The sensor consists of the sensor element which is in a cylindrical housing and one fiber which is connected to a laser source and one or two additional fibers that will connect to detectors. The interrogation system includes the laser source and detector(s) and control circuits. The sensor operates at an eye safe wavelength of 1550nm. The sensor produces a voltage proportional to measurand electric field. An oscilloscope, digitizer board, lock in amplifier or spectrum analyzer instrument need to be connected to system output to measure the electric field.


  • Based on thin film lithium niobate
  • Electro-optic micro-ring resonator
  • DC frequency up to 1 GHz frequencies

  • All dielectric materials
  • Immune from electromagnetic interference
  • High spatial resolution

Microring resonator sensor element, P/N MR-2.5GHz-300-XX-B

MicroRing E-field sensor datasheet

Parameter Value Additional Information
Dynamic range 0.1V/m – 0.5 MV/m
Sensitivity 100 mV/(m. Hz 0.5) Down to 10mV/(m.Hz0.5) is possible 
Response Gain 60 μV/(V/m) Measured at low frequency using standard controller unit
Selectivity (Orthogonal components rejection) >30 (dB)  
Optical insertion loss of the sensor -12 (dB)  
E-field direction XX PP or PL PP: E field Perpendicular to fiber

PL: E field Parallel to fiber

-3dB sensor bandwidth 2.5 (GHz)  
Sensor spatial resolution 300(μm)  
Packaged sensor size 3(mm) x 25(mm)  Can be reduced down to 1mm
Fiber pigtail 1(m)  
Fiber type, Connector PM, FC/APC  

E-field sensor controller system P/N: L-1550-40-D-XX-B

Parameter Value Additional Information
Laser Power 40 (mW)
Operating Wavelength
1550 (nm)
Balanced detector bandwidth


400: 50Hz-400MHz

2500: 1MHz-2.5GHz

Up to 40GHz bandwidth is possible
Typical Response gain 5 (μV/(V/m))  Measured at low frequency using standard controller unit
Rise time 0.25 (nsec)  Down to 6psec rise time is possible
Interrogator dimension 200x275x40(mm)  Down to 6psec rise time is possible
Interrogator dimension 1 (kg)  
Interrogator output SMA-50 ohm  
Input power 110-220 volt, 2 A