Phase error compensation for multilayered AWG in LCOS-based WSS

Sorimoto, Keisuke; Kintaka, Kenji; Kawashima, Hitoshi; Mori, Masahiko; Hasama, Toshifumi; Ishikawa, Hiroshi; Tsuda, Hitoshi; Uetsuka, Hiroshi

doi:10.1587/elex.8.2054

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…Typically, the former is a grating, and the latter is a microelectromechanical system (MEMS) [4,5] or a liquid-crystal-on-silicon (LCOS) [6,7,8]. The input WDM signal is spectrally decomposed by the grating and the focal position of the light on the switching engine is dependent on the wavelength of the light.…”

Section: Introductionmentioning

confidence: 99%

MEMS mirror with slot structures suitable for flexible-grid WSS

Sorimoto

Kawashima

Mori

et al. 2013

IEICE Electron. Express

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Abstract:We propose a microelectromechanical system (MEMS) mirror design, which is suitable for use in a flexible-grid wavelength selective switch (WSS). In the flexible grid operation with a conventional MEMS-based WSS, the diffraction loss at the inter-mirror gap regions caused a large ripple in the transmission spectra. On the other hand, the newly introduced slot structures in each mirror can reduce the ripples by intentionally attenuating the light on the mirrors to equalize the reflectance of the entire mirrors. We optimize the slot structure aiming for the flexible-grid WSS operation with a bandwidth-granularity of 12.5 GHz. The ripples are successfully reduced to below 0.004 dB with a loss penalty of only 1.05 dB.

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Section: Introductionmentioning

confidence: 99%

MEMS mirror with slot structures suitable for flexible-grid WSS

Sorimoto

Kawashima

Mori

et al. 2013

IEICE Electron. Express

Self Cite

View full text Add to dashboard Cite

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Compact and phase-error-robust multilayered AWG-based wavelength selective switch driven by a single LCOS

Sorimoto¹,

Tanizawa²,

Uetsuka³

et al. 2013

Opt. Express

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A novel liquid crystal on silicon (LCOS)-based wavelength selective switch (WSS) is proposed, fabricated, and demonstrated. It employs a multilayered arrayed waveguide grating (AWG) as a wavelength multiplex/demultiplexer. The LCOS deflects spectrally decomposed beams channel by channel and switches them to desired waveguide layers of the multilayered AWG. In order to obtain the multilayered AWG with high yield, phase errors of the AWG is externally compensated for by an additional phase modulation with the LCOS. This additional phase modulation is applied to the equivalent image of the facet of the AWG, which is projected by a relay lens. In our previously-reported WSS configuration, somewhat large footprint and increased cost were the drawbacks, since two LCOSs were required: one LCOS was driven for the inter-port switching operation, and the other was for the phase-error compensation. In the newly proposed configuration, on the other hand, both switching and compensation operations are performed using a single LCOS. This reduction of the component count is realized by introducing the folded configuration with a reflector. The volume of the WSS optics is 80 × 100 × 60 mm³, which is approximately 40% smaller than the previous configuration. The polarization-dependent loss and inter-channel crosstalk are less than 1.5 dB and -21.0 dB, respectively. An error-free transmission of 40-Gbit/s NRZ-OOK signal through the WSS is successfully demonstrated.

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Phase error compensation for multilayered AWG in LCOS-based WSS

Cited by 2 publications

References 3 publications

MEMS mirror with slot structures suitable for flexible-grid WSS

MEMS mirror with slot structures suitable for flexible-grid WSS

Compact and phase-error-robust multilayered AWG-based wavelength selective switch driven by a single LCOS

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