LCoS-Based Wavelength-Selective Switch for Future Finer-Grid Elastic Optical Networks Capable of All-Optical Wavelength Conversion

Xie, Dequan; Wang, Danshi; Zhang, Min; Liu, Zichen; You, Quan; Yang, Qi; Yu, Shaohua

doi:10.1109/jphot.2017.2671436

Cited by 38 publications

(15 citation statements)

References 16 publications

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“…Currently, the spatial light modulator (SLM) utilizing LCoS (LCoS-SLM) is the most competing technique adopted in the design of multiple port WSSs [10][11][12][13][14]. LCoS device combing with gratings can be further developed as programmable PSP for processing optical spectrum resources [15].…”

Section: Of 11mentioning

confidence: 99%

Programmable High-Resolution Spectral Processor in C-band Enabled by Low-Cost Compact Light Paths

Liu

Tao³

et al. 2020

Photonics

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The flexible photonics spectral processor (PSP) is an indispensable element for elastic optical transmission networks that adopt wavelength division multiplexing (WDM) technology. The resolution and system cost are two vital metrics when developing a PSP. In this paper, a high-resolution 1 × 6 programmable PSP is investigated and experimentally demonstrated by using low-cost compact spatial light paths, which is enabled by a 2 K (1080p) liquid crystal on silicon (LCoS) and two cascaded transmission gratings with a 1000 line/mm resolution. For each wavelength channel, the filtering bandwidth and power attenuation can be manipulated independently. The total insertion loss (IL) for six ports is in the range of 5.9~9.4 dB over the full C-band. The achieved 3-dB bandwidths are able to adjust from 6.2 GHz to 5 THz. Furthermore, multiple system experiments utilizing the proposed PSP, such as flexible spectral shaping and optical frequency comb generation, are carried out to validate the feasibility for the WDM systems.

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Section: Of 11mentioning

confidence: 99%

Programmable High-Resolution Spectral Processor in C-band Enabled by Low-Cost Compact Light Paths

Liu

Tao³

et al. 2020

Photonics

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“…However, DMD and MEMS based reconfigurable optical filters [12,13,14] up to date have the minimum spectral bandwidth of 25 GHz in C-band (The TrueFlex Twin Multi-Cast Switch produced by Lumentum), so that they cannot adapt to the development of the new ITU-T standard grid frequencies. Although it was reported LCoS-based WSSs [15,16] have achieved 12.5 GHz or even smaller minimum bandwidth and higher tuning resolution, the LCoS processor under high power operation starts to deteriorate in function, even acquiring permanent, irreparable damage [17]. In comparison, the DMD has a high power handling capability and the only limit of the device under high power illumination is that the aluminum micromirrors must operate below 150 °C [18].…”

Section: Introductionmentioning

confidence: 99%

Programmable Spectral Filter in C-Band Based on Digital Micromirror Device

Gao

Chen

et al. 2019

Micromachines

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Optical filters have been adopted in many applications such as reconfigurable telecommunication switches, tunable lasers and spectral imaging. However, most of commercialized filters based on a micro-electrical-mechanical system (MEMS) only provide a minimum bandwidth of 25 GHz in telecom so far. In this work, the programmable filter based on a digital micromirror device (DMD) experimentally demonstrated a minimum bandwidth of 12.5 GHz in C-band that matched the grid width of the International Telecommunication Union (ITU) G.694.1 standard. It was capable of filtering multiple wavebands simultaneously and flexibly by remotely uploading binary holograms onto the DMD. The number of channels and the center wavelength could be adjusted independently, as well as the channel bandwidth and the output power. The center wavelength tuning resolution of this filter achieved 0.033 nm and the insertion loss was about 10 dB across the entire C-band. Since the DMD had a high power handling capability (25 KW/cm2) of around 200 times that of the liquid crystal on silicon (LCoS) chip, the DMD-based filters are expected to be applied in high power situations.

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“…Over last few years, LCOS started to play an important role for WSS in industrial reconfigurable optical add-drop multiplexer [8][9][10] (ROADM) to provide a flexible and reconfigurable routing in the complex and high capacity network architecture. For this application, the flicker, crosstalk and insertion loss (IL) induced by LCOS are three existing issues that can be improved to enhance the overall system performance.…”

Section: Introductionmentioning

confidence: 99%

Design, implementation, and study of the high-resolution high-efficiency liquid crystal on silicon spatial light modulator for the telecommunication application in the short-wave infrared spectral band

Chen

Engel

Lazarev

et al. 2019

Emerging Liquid Crystal Technologies XIV

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There are many important applications for phase-only liquid crystal on Silicon-based spatial light modulators (LCOS SLMs). Among the applications, the diffractive beam splitting, beam shaping and beam steering with LCOS SLM are finding more and more use in telecommunication applications (e.g. wavelength selective switch for ROADM, space and mode division multiplexing). However, many effects of LCOS device have to be considered if we want to get high quality output light field. For example, the ideal phase, intensity and polarization distribution in far field are usually deteriorated by the pixelated metal structure and fringing field effects. Thus, the total efficiency is decreased. By using electro-optical and electromagnetic simulation methods, we can properly incorporate the effects that influence the optical performance of LCOS and optimize the design. Furthermore we report the implementation of the high-performance high-resolution LCOS SLM for the telecommunication C-and L-band with the average insertion loss (IL) of less than 0.2 dB, achieved by the reflectivity-enhancement coating on the LCOS backplane. The experimental results on reflectivity, diffraction efficiency, crosstalk and other important parameters are compared with the theoretical predictions.

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LCoS-Based Wavelength-Selective Switch for Future Finer-Grid Elastic Optical Networks Capable of All-Optical Wavelength Conversion

Cited by 38 publications

References 16 publications

Programmable High-Resolution Spectral Processor in C-band Enabled by Low-Cost Compact Light Paths

Programmable High-Resolution Spectral Processor in C-band Enabled by Low-Cost Compact Light Paths

Programmable Spectral Filter in C-Band Based on Digital Micromirror Device

Design, implementation, and study of the high-resolution high-efficiency liquid crystal on silicon spatial light modulator for the telecommunication application in the short-wave infrared spectral band

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