The all fibre interferometer is unique in its use of

• multi-wavelength fibre laser, yielding a large dynamic range
• integrated optoelectronics and signal processing
• improvements to the 3 and 4-phase stepping algorithms previously used
• This was a collaborative project, partially supported by DST, between the microelectronics and the optics groups. The interferometer works in two modes.

1. One measurement wavelength, has a maximum range of 773 nm with a resolution of approximately 30 nm
2. Two measurement wavelengths, has a maximum range of 360 μm with a resolution of 20μm

Read more about it here.