Optical transient spectrum analyzer (OTSA) with high time‐resolution

Kiminori Sato, Yoji Nagasawa, Hideaki Sone, Tasuku Takagi

Research output: Contribution to journalArticlepeer-review


To analyze optical sources with time‐varying spectra, an optical transient spectrum analyzer (OTSA) with high time resolution is developed. In the spectrum analyzer, the dispersive light is focused on the CCD by a lens and each pixel of the CCD is made to correspond to one spectrum line. It is possible to realize wavelength resolutions between 0.2 and 0.63 nm by changing the optical elements. Variations of extraction pixels of CCD allow time resolutions between 23 μs and 1 ms. Therefore, various applications (such as optical source analyzing systems) are expected. The data from CCD are A‐D transformed and stored in a floppy disk. Therefore, it becomes possible to discuss the characteristics of the optical sources quantitatively. Finally, as an example, the transient mode‐hopping phenomenon of a semiconductor laser is time resolved with high speed and its three‐dimensional (3‐D) observation is presented.

Original languageEnglish
Pages (from-to)42-50
Number of pages9
JournalElectronics and Communications in Japan (Part II: Electronics)
Issue number10
Publication statusPublished - 1990

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


Dive into the research topics of 'Optical transient spectrum analyzer (OTSA) with high time‐resolution'. Together they form a unique fingerprint.

Cite this