Multi Channel Wavelength-Selective Optical Filter Using Pillbox Resonator

使用药盒谐振器的多通道波长选择光学滤波器

• 批准号: 09650052
• 负责人: WADA Osami
• 金额: $ 1.34万
• 依托单位: Okayama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650052/
• 关键词: optical resonator; wavelength division multiplexing; pillbox resonator; optical waveguide; optical modulator; optical filter; wavelength selectivity

This research is to investigate the wavelength selective optical filter utilizing a pillbox optical resonator (Japan Patent No. 2713358, Oct. 311997) which the investigators of this project proposed. New application of the resonator has also been proposed in this research This optical filter is composed of a circular disk resonator and waveguides for input and out- put ; which are fabricated on electro-optical dielectric substrate.In the first year, investigation on waveguide fabrication for the optical filter was performed. Analytical investigation on optimal design of the filter and on resonant wavelength control with electrodes were also performed. The results of analysis at 1.55 mum band show that a pillbox resonator with graded-index distribution has similar characteristics to a resonator with step-index which had been previously analyzed. Results of calculation about wavalength control are ; 104 GHz of FSR, 2.4 GHz of pass band width, 11V of applied voltage at as high as 800 MHz with larger extinction ratio than 20dB, with cross- talk less than-20 dB with channel separation 10 GHz The results show that the optical filter can be used as a high-speed wavelength-selective optical modulator (WSOM).In the second year, the investigators found specific characteristics of WSOM ; peak output power of the modulator ex- ceeds 3 times as large as the CW input power at a specific modulation frequency with sinusoidal modulation signal close to the resonance. The investigators call this phenomenon as "amplifying modulation". By optimizing the modulation signal waveform, the factor of 6.5 of the modulation gain was achieved.As for waveguide fabrication, a laser beam direct writing system was investigated. Characteristics related to the scanning speed of position controllers were tested and the control software was optimized. As a result it is concluded that required precision of fabrication was achieved to realize the proposed filter and the modulator.

本研究是为了研究本项目的研究者提出的利用药丸盒光学谐振器（日本专利No.2713358，1997年10月31日）的波长选择光学滤波器。本研究还提出了这种谐振腔的新应用，这种光滤波器由一个圆盘谐振腔和制作在电光介质基片上的输入输出波导组成。对滤波器的优化设计和用电极控制谐振波长进行了分析研究。在1.55妈妈波段的分析结果表明，具有梯度折射率分布的药盒谐振器具有类似的特性，与先前分析的阶跃折射率的谐振器。波长控制的计算结果为：FSR为104 GHz，通带宽度为2.4 GHz，工作电压为11 V，工作频率为800 MHz，消光比大于20 dB，通道间隔为10 GHz时，串扰小于-20 dB。研究人员发现了WSOM的特殊特性; 2在正弦调制信号接近谐振的特定调制频率下，调制器的峰值输出功率超过CW输入功率的3倍。研究人员称这种现象为“放大调制”。通过对调制信号波形的优化，使调制增益提高到6.5倍。对位置控制器的扫描速度特性进行了测试，并对控制软件进行了优化。其结果是，它的结论是，所需的制造精度达到实现建议的滤波器和调制器。