Channel skip filters are components added to wavelength division multiplexing (WDM) add/drop modules — in both coarse wavelength division multiplexing (CWDM) and dense wavelength division multiplexing (DWDM) applications — to facilitate band splitting and to manage multiple ITU channels.
These filters feature narrow transitions from pass band to blocking band, minimizing lost channels while maintaining high spectral efficiency (i.e., limiting insertion loss) since the express channels undergo only one reflection.
The wavefront error (WE) of a surface with an optical coating (“filter”) is ideally measured at the in-band wavelength of the filter. However, quite often this is not possible, requiring that the filter be measured at an out-of-band wavelength (typically 633 nm), assuming that the filter transmits (for transmitted WE, or TWE) or reflects (for reflected WE, or RWE) at this wavelength. This out-of-band TWE/RWE is generally assumed to provide a good estimation of the desired in-band TWE/RWE. It will be shown in this paper that this is not the case for a large class of filters (i.e., bandpass) where the group delay is significantly different at the in-band and out-of-band wavelengths and where the optical filter exhibits a thickness non-uniformity across the surface.
How Compensating Gain Flattening Filters Improve PPEF Performance. Iridian’s premium compensating GFFs offer a means to better control PPEF using what is known as the multi-design compensating method.
Iridian will be exhibiting at the InterOpto 2024 event at Pacifico Yokohama in Yokohama, Japan. You are invited to visit our booth B-13 to discuss your optical filter needs.
Please come to visit us at Booth #19 at this year’s ICSO event in France. Jason Palidwar from Iridian will be there to discuss your needs for optical filters.
The 25th China International Optoelectronic Exposition (CIOE) will be held from September 11 to 13, 2024, at the Shenzhen World Exhibition and Convention Center.
Mr. Xiaolun Zeng and Mr. Yongbao Xin will be there to discuss clients’ potential needs for Telecom filters
Precise use of filters gives Raman spectroscopy fantastic utility not only in drug identification and inspection but also the detection of explosives and unknown substances, materials inspection by U.S. Customs and port authorities, and food safety inspection. To learn more about choosing the right optical filter(s) for your drug ID applications, click to read the full article, contact the author or visit our website.
In this short video from Iridian’s booth on the exhibition floor at Photonics West 2024, Jason Palidwar describes emerging applications for optical filters including satellite lasercom, Raman in bio-med, and Earth Observation for environmental management.
Iridian will be exhibiting at the OPIE’24 event in Pacifico Yokohama, Japan between Apr 24 – 26. Please visit us at booth J-25 to discuss your needs for optical filters for communications (telecom, datacom, satcom), spectroscopy instrumentation (Raman,...
Iridian will be exhibiting at the SPIE Defense + Commercial Sensing event in National Harbor, Maryland, USA.
Please visit us at booth #834 to discuss your needs for optical filters sensing and imaging applications including Earth observation, gas detection, LiDAR, and machine vision.
