Etern Optoelectronics offers ultra-low-shift DWDM thin film filter for 400G ZR modules

Aug. 4, 2022

The TFF offers a temperature shift in the -40~85℃ range of less than 0.11 pm/℃ as well as flatness of less than 0.3 nm.

Etern Optoelectronics now offers DWDM thin film filters whose performance exhibits very small temperature shift.

Etern Optoelectronics says it now offers a 100-GHz DWDM thin film filter (TFF) that exhibits extremely small temperature shift. The TFF offers a temperature shift in the -40~85℃ range of less than 0.11 pm/℃ as well as flatness of less than 0.3 nm. These properties make the TFF a good choice for 400G ZR designs, the company asserts.

Etern Optoelectronics' DWDM TFF offers a surface flatness of

The temperature-shift performance results from Etern’s research in basic material technology that has enabled matching the temperature performance of TFF electrolyte film and silicon dioxide substrates. Etern says the flatness derives from the company’s investments in manufacturing, including coating machines, production and testing equipment, the use of ion-assisted deposition (IAD) technology, and an ultra-smooth polishing process.

“The technical breakthrough of temperature shift is a huge improvement in the TFF process, “said Harvey Liu, general manager of overseas business at Etern Optoelectronics. “We see the growth of DWDM transmission networks, especially the 400G ZR and Open ZR+, and the next-generation 800G ZR. The ultra-low temperature shift is the key performance factor to achieve narrow channel spacing in DWDM systems. With our technology, 75-GHz or even narrower channel spacing for DWDM is possible. We are delighted to provide a new possible design for DWDM transmission networks.”

Etern says the 100-GHz DWDM TFF is in mass production and commercial application. A 50-GHz DWDM TFF has completed small batch trial production. The company says it also will accept orders for customized CWDM4 and LWDM Z-block TFF and Z-block finished products.

For related articles, visit the Optical Technologies Topic Center.

For more information on optical components and suppliers, visit the Lightwave Buyer’s Guide.

To stay abreast of optical communications technology, subscribe to Lightwave’s Enabling Technologies newsletter.

About the Author

Stephen Hardy | Editorial Director and Associate Publisher, Lightwave

Stephen Hardy is editorial director and associate publisher of Lightwave and Broadband Technology Report, part of the Lighting & Technology Group at Endeavor Business Media. Stephen is responsible for establishing and executing editorial strategy across the both brands’ websites, email newsletters, events, and other information products. He has covered the fiber-optics space for more than 20 years, and communications and technology for more than 35 years. During his tenure, Lightwave has received awards from Folio: and the American Society of Business Press Editors (ASBPE) for editorial excellence. Prior to joining Lightwave in 1997, Stephen worked for Telecommunications magazine and the Journal of Electronic Defense.

Stephen has moderated panels at numerous events, including the Optica Executive Forum, ECOC, and SCTE Cable-Tec Expo. He also is program director for the Lightwave Innovation Reviews and the Diamond Technology Reviews.

He has written numerous articles in all aspects of optical communications and fiber-optic networks, including fiber to the home (FTTH), PON, optical components, DWDM, fiber cables, packet optical transport, optical transceivers, lasers, fiber optic testing, and more.

You can connect with Stephen on LinkedIn as well as Twitter.