A new type of optical encoder based on linearly polarised light from a photonic quantum ring (PQR) laser is reported. An encoded track of alternating p1- and p2-orthogonally polarised emission states embedded in a zigzag-shaped PQR laser train is read with a polarised photodetector in order to realise a polarisation-resolved positional detection scheme
Published in:
Electronics Letters
(Volume:43
,
Issue:
3
)
Date of Publication: Feb. 1 2007