Etalons are narrowband wavelength filters. They offer the advantages of transmission. Because etalons feature low wavefront distortion, low insertion loss, easy tenability etc, they are widely applied in fiber communications such as WDM networks, tunable filter, wavelength locker, DWDM system etc.
We offer two types of etalons for filter communication; Air-spaced Etalons and Solid Etalons.
Air-spaced Etalons:
Air-spaced etalons are two extremely parallel plates polished to very tight specification with an air gap between them. Using a ULE or fused silica as a gasket that is optically contacted between the two plates creates the air gap. Designed with special partial reflecting etalon coating and AR coatings result in improved transmission. The mechanical design is robust and our etalon has great thermal stability. Out air-spaced etalons are available in a wide range of FSR values from 1500 GHz to 10 GHz.
Solid etalons:
Solid etalon are two parallel plates but with a special coating to create the cavity. High quality cavities result in higher transmission a compact size and lower cost. These etalons have the potential for a high damage threshold and are particularly good for intercavity use. Our solid etalons are available in a wide range of FSR’s, from 1500 GHz to 10 GHz.
Capability:
Attribute | Commercial | High Precision | ||
Operating Wavelength | 1520-1620nm | |||
Material | Fused silica, optical-grade silicon, Zerodur | |||
Typical Free Spectral Range (FSR) | 25 GHz / 50 GHz / 100 GHz (Other FSR available) | |||
FSR Tolerance | 25 GHz | ±0.0025 GHz | 25 GHz | ±0.0015 GHz |
50 GHz | ±0.005 GHz | 50 GHz | ±0.003 GHz | |
100GHz | ±0.025 GHz | 100 GHz | ±0.015 GHz | |
Surface Quality （scratch-dig） | 20-10 | 10-5 | ||
Angle of Incidence | 0° | |||
Single Surface Reflectivity | >90% | |||
Operating Temperature | User specified | |||
Diameter D (mm) | 1 mm x 1 mm (minimum) | |||
Typical Lead Time | 5-8 weeks | |||
