| Project/Area Number |
10555015
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B).
|
| Allocation Type | Single-year Grants |
|---|
| Section | 展開研究 |
|---|
| Research Field |
Applied optics/Quantum optical engineering
|
|---|
| Research Institution | Yokohama National University |
|---|
Principal Investigator |
KOKUBUN Yasuo Yokohama National University, Faculty of Engineering, Professor, 工学部, 教授 (60134839)
|
|---|
| Project Period (FY) |
1998 – 2000
|
| Project Status |
Completed (Fiscal Year 2000)
|
| Budget Amount *help |
¥10,400,000 (Direct Cost: ¥10,400,000)
Fiscal Year 2000: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1999: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 1998: ¥4,300,000 (Direct Cost: ¥4,300,000)
|
|---|
| Keywords | Optical waveguide / Optical filter / Temperature dependence of center wavelength / Temperature dependence / Athermal waveguide / Trimming |
|---|
| Research Abstract |
In this study, we aimed at develping a precise trimming technique of center wavelength of narrow-band optical filters as well as the athermalization of center wavelength. Two years ago we successfully realized the temperature independent optical filter using an athermal waveguide in which optical path length is independent of temperature, and also demonstrated a UV-trimming technique of center wavelength of the vertically coupled X-crossing Add/Drop filter. In this year, we realized the precise control of center wavelength of microring resonator Add/Drop filter using the UV-trimming technique.
Vertically coupled microring resonator filter is an attractive Add/Drop wavelength filter due to its functionality, compactness, and the possibility of dense integration resulting from the cross-grid configuration. However, in the concatenated 1X8 filter array in which the ring radii are changed with the increments of 50nm, the wavelength channel spacing was limited to 5.7nm due to the resolution limit of photomask (50nm). Therefore, we developed a new technique to control precisely the channel spacing to be smaller than 1nm by using the UV-trimming technique using polysilane as the overcladding layer. As a result, we successfully decreased the channel spacing to 0.5nm, and also controlled the channel spacing precisely to 1.0nm using the same trimming technique.
In addition, the ultra-short optical pulse transmission characteristics of microring resonator filter was investigated experimentally and theoretically.
|
