Optical Arbitrary Waveform Processing of Over 100 Spatial Channels for Optical Performance Monitoring

We developed an optical processing platform that handles over 100 space-division-multiplexed signals in the C-band. The device consists of free-space optics based on liquid crystal on silicon (LCOS) with a waveguide frontend. Thanks to the holographic wavefront modulation by the LCOS spatial light m...

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Bibliographic Details
Published in:Journal of lightwave technology 2019-01, Vol.37 (2), p.291-299
Main Authors: Nakajima, Mitsumasa, Suzuki, Kenya, Seno, Kazunori, Kasahara, Ryoichi, Goh, Takashi, Miyamoto, Yutaka, Hashimoto, Toshikazu
Format: Article
Language:English
Subjects:
C band
Channels
Delay lines
Dependence
Division
Domains
Free space optics
Holography
Integrated optics
Liquid crystal on silicon
Liquid crystals
Monitoring
Optical attenuators
Optical communication
Optical fibers
Optical filters
optical waveguides
Optical wireless
Signal processing
space division multiplexing
Spatial light modulators
Wave attenuation
wavelength division multiplexing
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Summary:We developed an optical processing platform that handles over 100 space-division-multiplexed signals in the C-band. The device consists of free-space optics based on liquid crystal on silicon (LCOS) with a waveguide frontend. Thanks to the holographic wavefront modulation by the LCOS spatial light modulator, the device arbitrarily manipulates the optical amplitude and phase in the space and spectral domains simultaneously. This ability enables us to create various optical processing functions such as tunable wavelength filtering, variable optical attenuation, and flexible delay line interferometry with arbitrary spatial and wavelength channel dependence. These functions are highly suitable for large-scale optical performance monitoring (OPM). As an application, we demonstrate OPM for 100 spatial channels over the C-band. The constructed OPM can monitor not only the power spectrum but also the optical signal-to-noise ratio (OSNR) by setting different LCOS phase patterns. We achieved channel power monitoring and OSNR monitoring with 1.8- and 1.9-dB accuracy over 100 spatial channels.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2018.2869895