Study on high-speed optical frequency shifter utilizing polarization-reversal structure

利用偏振反转结构的高速光学移频器的研究

• 批准号: 16360174
• 负责人: MURATA Hiroshi
• 金额: $ 9.66万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360174/
• 关键词: Optical frequency shifter; electrooptic modulation; polarization reversal; optical waveguide; quasi velocity matching; optical integrated circuit; lithium tantalate; 共振電極

An optical frequency shifter (OFS) is an important device in many optoelectronics systems, such as, optical communication systems, optical signal processing, optical measurements, laser spectroscopy, laser cooling, photochemistry, and so on. However, the operation frequencv of a commerciallv available OFS by acousto-optic effects is in several hundred MHz, therefore, a high-speed OFS with the operation frequency over GHz is expected in many application fields.In this research project, we have studied a novel electrooptic (EO) high-speed OFS by using a new guided-wave optical circuit, which we call as '3-branch waveguide interferometer' and the polarization-reversal techology of ferroelectric materials. This OFS is very compact and can be operated in very high frequency (1-100GHz) with only a single RF modulation signal and DC bias voltages. A continuous sweep of optical frequency over several GHz is possible, and the direction of a frequency shift (upper or lower) can be switched by tuning DC bias voltages.The operation of the proposed OFS has been analyzed in detail and proto-type devices has been designed and fabricated by use of z-cut LiTaO_3. In the experiment, basic operations of the fabricated OFS have been confirmed successfully around the designed operational frequency of 15GHz and 25GHz.The applications of the fabricated OFS to a wavelength-division-multiplexing (WDM) optical fiber communication system have carried out and optical frequencies of several muitiplexed signals have been shifted simultaneously by using the fabricated OFS. The applications to laser spectroscopy have also carried out and absorption spectrum of a standard gas-cell has been measured by using the fabricated OFS.

光移频器是光通信、光信号处理、光学测量、激光光谱学、激光冷却、光化学等光电子系统中的重要器件，但目前市售的声光效应光移频器的工作频率在几百MHz左右，因此，光移频器的工作频率在几百MHz左右。工作频率在GHz以上的高速OFS在许多应用领域都有着广泛的应用前景，本课题研究了一种新型的电光高速OFS，我们称之为“三分支波导干涉仪”和铁电材料的极化反转技术。该OFS结构紧凑，工作频率高（1- 100 GHz），仅需一个射频调制信号和直流偏置电压。利用Z切LiTaO_3材料设计并制作了光频移的原型器件，并对器件的工作原理进行了详细的分析。在实验中，成功地验证了所制作的OFS在15 GHz和25 GHz工作频率附近的基本工作特性，并将其应用于波分复用（WDM）光纤通信系统中，实现了多路复用信号光频的同时移频。并将其应用于激光光谱学，测量了标准气室的吸收光谱。

项目成果

Electro-optic single-sideband modulator with resonant electrodes and polarization-reversed structures

具有谐振电极和偏振反转结构的电光单边带调制器

• 发表时间: 2006
• 期刊: Japanese Journal of Applied Physics (in press)
• 作者: Shigehiko Matsunaga;Hiroshi Murata
• 通讯作者: Hiroshi Murata

Electrooptic single-sideband modulator using resonant electrodes and polarization-reversed structure

使用谐振电极和偏振反转结构的电光单边带调制器

• 发表时间: 2005
• 期刊: Proceedings of the Confernce on Lasers and Electro-Optics 2005 (CLEO2005) 1・1
• 作者: Hiroshi Murata;et al.
• 通讯作者: et al.

Guided-wave electro-optic modulators using novel electrode structure of coupled microstrip line resonator

采用新型耦合微带线谐振器电极结构的导波电光调制器

• 发表时间: 2005
• 期刊: IEICE Transaction of Electronics E88-C・3
• 作者: Shigehiko Matsunaga;Hiroshi Murata;Akira Enokihara
• 通讯作者: Akira Enokihara

Resonant electrode guided-wave electrooptic phase modulator using polarization-reversal structures

采用偏振反转结构的谐振电极导波电光相位调制器

• 发表时间: 2005
• 期刊: Electronics Letters 41・8
• 作者: Shigehiko Matsunaga;Hiroshi Murata;Akira Enokihara;Hiroshi Murata
• 通讯作者: Hiroshi Murata

Optical Pulse Generation using Guided-Wave Electrooptic Modulator with Resonant Electrodes and Polarization Reversal

使用具有谐振电极和偏振反转的导波电光调制器生成光脉冲

• 发表时间: 2006
• 期刊: IEEE/OSA Journal of Lightwave Technology (in press)
• 作者: Shigehiko Matsunaga