Hybrid microlaser encoder

Renshi Sawada, Eiji Higurashi, Yoshito Jin

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


We have developed a microlaser encoder that can detect displacements relative to an external grating scale with a resolution on the order of 10 nm. Its size is only a few tens of a percent of a conventional encoder's. A long-lasting InP laser diode with a wavelength of 1550 nm was bonded, along with several photodiode chips, within an alignment accuracy of 1μm onto a silicon planar lightwave circuit chip. The chip is 2.3 mm × 1.7 mm and includes a fluorinated polyimide lightwaveguide fabricated in advance. A wide gap of more than 600 μm was obtained between the external grating scale and the encoder despite the tiny size of the sensor. When used as a rotary encoder, the number of rotations could also be detected. Thus, this microencoder satisfies the market requirements for practical use.

Original languageEnglish
Pages (from-to)815-820
Number of pages6
JournalJournal of Lightwave Technology
Issue number3
Publication statusPublished - Mar 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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