Fiber Mode Field Adapters

  • High Reliability
  • Ultra-Low Loss
  • Passive

Click 'Spec Sheet' for available configurations/part#

Standard splice between two asymmetric fiber geometries can lead to high insertion loss and degradation of the beam quality. A mode field adapter overcome this using an adiabatic taper between the two fibers to gradually expand or compress the mode field to achieve maximum signal transmission and M2 beam quality. Our Mode Field Adapters efficiently expand the mode field of an SM optical fiber or large-mode-area (LMA) fiber to match the LP01 mode of a larger LMA fiber. The PM Mode Field Adapter similarly expands the mode field of a PM optical fiber to match the LP01 mode of a polarization-maintaining LMA (PLMA) fiber while maintaining a high PER. These devices are bidirectional and can also be used in reverse to compress the mode field when the output end is used as an input. We offer standard configurations for most application scenarios. Customer parts are available with a NRE fee for different optical fibers, power levels, and package configurations by email.


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MFAD Min Typical Max Unit
Operation Wavelength                                                                1030-1080 or 1450-1600 nm
Insertion Loss [1] 0.2 0.5 dB
Polarization Dependent Loss  (SM version only) 0.01 0.03 dB
Extinction Ratio (PM version only) 17 23 25 dB
Max Power 5000[2] W
Return Loss     45 dB
Operating Temperature -10 85 oC
Storage Temperature -40 85 oC


[1].Without connector and at room temperature

[2]Require to mount on an effective heat sink