This paper describes a compact optical channel monitor and a delayed
interferometer having free-space optical elements such as lenses or
mirrors, as an application of microoptics. These devices have been
developed to be built into dense wavelength division multiplexing
(DWDM) transmission systems. These optics use a Gaussian beam which is
emitted through single-mode optical fibers and located near the optical
axis. This paper explains the optical designs of these devices based on
the Gaussian beam's behavior.
SANPEI Yoshihiro*1 SUZUKI Yasuyuki*2 IEMURA Kouki*3 ASANO Junichirou*3
*1Communication and Measurement Business Headquarters, Optical Communication Measurement Development Department
*2Communication and Measurement Business Headquarters, Core Technology Development Department
*3Photonics Business Headquarters, Engineering Department IV
An Optical Spectrum Analyzer (or OSA) is a precision instrument designed to measure and display the distribution of power of an optical source over a specified wavelength span. An OSA trace displays power in the vertical scale and the wavelength in the horizontal scale.
Optical test equipment or optical measuring instruments are used to measure and characterize the physical properties of light.
An optical time domain reflectometer (OTDR) is a precision instrument used to locate events or faults along a fiber link, typically within an optical communications network.