Abstract
We propose a wavelength-insensitive tunable ladder-type interferometric filter having a novel configuration for use in a widely tunable laser diode. The spectral characteristics of the proposed device are numerically analyzed and compared with those of our previously reported device regarding transmittance and bandwidth. Wavelength-insensitive tuning and flat-topped filter spectra are obtained by optimizing device parameters. We also discuss the applicability of the proposed ladder filter to a widely tunable laser. The proposed tunable laser has a nearly constant threshold current density with tuning current injection. The oscillation frequency of the laser diode can be stabilized by introducing chirping into the ladder filter to obtain a single passband response. These high-performance spectral characteristics make the proposed device feasible for wavelength- division-multiplexing-based systems.
| Original language | English |
|---|---|
| Pages (from-to) | 4090-4096 |
| Number of pages | 7 |
| Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
| Volume | 45 |
| Issue number | 5 A |
| DOIs | |
| Publication status | Published - 2006 May 9 |
| Externally published | Yes |
Keywords
- Integrated optics
- MMI coupler
- Tunable filter
- Tunable laser
- Waveguide device
ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy(all)