English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The wavelength-tunable filter is a key device for creating colorless, directionless, and contentionless reconfigurable optical add-drop multiplexers. Although arrayed-waveguide gratings (AWGs) can realize compact and cost-effective tunable filters, crosstalk in wavelength-division-multiplexing systems increases as the frequency grid spacing decreases. To resolve this problem, we propose a tunable-filter architecture that can eliminate the crosstalk by utilizing two specific (commeasurable) cyclic AWGs in conjunction with multiple switches based on symmetric Mach-Zehnder interferometers and an asymmetric Mach-Zehnder interferometer (AMZI) filter. To verify the technical feasibility of the proposed architecture, we fabricate a monolithic prototype using planar-lightwave-circuit technology. We confirm, for the first time, its excellent performance by measuring insertion loss, polarization-dependent loss, and bit error ratios (BERs). Alternative tunable-filter configurations employing multiple AMZI-based filters are newly investigated for future applications.

Wavelength-Tunable Filters Utilizing Arrayed Waveguide Gratings for Colorless/Directionless/Contentionless Optical Signal Drop in ROADMs