SBIR Phase I: Feasibility of Chiral Fiber Polarizer

SBIR第一阶段：手性光纤偏振器的可行性

• 批准号: 0340149
• 负责人: Dan Neugroschl
• 金额: $ 10万
• 依托单位: CHIRAL PHOTONICS, INC
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-01-01 至 2004-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0340149&HistoricalAwards=false
• 关键词: SBIR; Phase; Feasibility; Chiral; Fiber

This Small Business Innovation Research (SBIR) Phase I project is to demonstrate the feasibility of a new class of in-fiber polarizers and polarization converters based upon chiral optical fibers. Helical birefringence is imparted to these optical waveguides by twisting fibers with noncircular cores as they pass through a miniature oven. Thus thesechiral fiber gratings (CFGs) do not require coherent irradiation of photosensitive glass, which is used to process fiber Bragg gratings (FBGs), but rather are created in a versatile continuous process from specially prepared glass preforms. They are true fiber devices and do not require any substrates, bulk components, or rigid package. Both the polarizer and polarization converter will be based on CFGs with a pitch of tens of microns. These CFG-based devices, which will be fabricated at dramatically reduced cost, will permit the control of the polarization of transmitted light with high extinction ratio over broad or narrow spectral ranges as dictated by the application. They will have broad application in telecommunications to polarization mode dispersion (PMD) compensation, wavelength- division multiplexing (WDM), and Faraday rotators. Polarizers are also key to sensors relying on optical interference such as gyroscopes.Polarization and frequency selective chiral fibers have applications ranging from telecommunications to sensing. The use of external modulators for high bandwidth fiber telecommunication requires that the incident wave be linearly polarized. This necessitates use of a polarizer since laser sources used in telecommunications generally have random polarization. Further any use of polarization maintaining fiber requires that polarized light be launched into the fiber. Polarizers are also key components in PMD compensation systems. The versatile chiral polarizers may be fabricated from refractory or radiation resistive glasses so that they may function in harsh environments with high levels of radiation, high temperature, or corrosive chemicals.

该小型企业创新研究（SBIR）第一阶段项目旨在证明基于手性光纤的新型光纤内偏振器和偏振转换器的可行性。 螺旋双折射是赋予这些光波导扭曲纤维与非圆形核心，因为他们通过一个微型炉。 因此，这些手性光纤光栅（CFG）不需要相干照射的光敏玻璃，这是用来处理光纤布拉格光栅（FBG），而是在一个通用的连续过程中创建从专门准备的玻璃预制件。 它们是真正的光纤器件，不需要任何衬底、散装组件或刚性包装。 偏振器和偏振转换器都将基于间距为数十微米的CFG。 这些基于CFG的器件将以显著降低的成本制造，将允许控制透射光的偏振，并在由应用决定的宽或窄光谱范围内具有高消光比。 它们将在电信中广泛应用于偏振模色散（PMD）补偿、波分复用（WDM）和法拉第旋转器。偏振器也是依赖于光学干涉的传感器（如陀螺仪）的关键。偏振和频率选择性手征光纤的应用范围从电信到传感。 高带宽光纤通信使用外部调制器要求入射波是线性偏振的。 这需要使用偏振器，因为电信中使用的激光源通常具有随机偏振。 此外，保偏光纤的任何使用都需要将偏振光发射到光纤中。 偏振器也是PMD补偿系统中的关键部件。 通用手性偏振器可由耐火或抗辐射玻璃制造，使得它们可在具有高水平辐射、高温或腐蚀性化学品的恶劣环境中起作用。