Cross-talk analysis in a telecentric adaptive free-space optical relay based on a spatial light modulator

Leyva, D. Gil; Robertson, Brian; Wilkinson, Timothy D.; O’Brien, Dominic; Faulkner, Grahame

doi:10.1364/ao.45.000063

Cited by 15 publications

(11 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These have been discussed in detail by several authors [5,8,9, and 15]. Their studies have shown that although the maximum deflection angle occurs when the period T 2Δ, the usable deflection angles are restricted to a smaller range due to a roll-off in diffraction efficiency that occurs when a quantized blazed grating is displayed on the SLM [15]. In addition, the number of individually addressable points at the replay plane is directly proportional to the number of SLM pixels illuminated.…”

Section: Theory Of Wavefront Encoding Based On Defocusmentioning

confidence: 98%

Use of wavefront encoding in optical interconnects and fiber switches for cross talk mitigation

et al. 2012

Self Cite

View full text Add to dashboard Cite

A technique of cross talk mitigation developed for liquid crystal on silicon spatial light modulator based optical interconnects and fiber switches is demonstrated. By purposefully introducing an appropriate aberration into the system, it is possible to reduce the worst-case cross talk by over 10 dB compared to conventional Fourier-transform-based designs. Tests at a wavelength of 674 nm validate this approach, and show that there is no noticeable reduction in diffraction efficiency. A 27% spot increase in beam diameter is observed, which is predicted to reduce at longer datacom and telecom wavelengths.

show abstract

Section: Theory Of Wavefront Encoding Based On Defocusmentioning

confidence: 98%

Use of wavefront encoding in optical interconnects and fiber switches for cross talk mitigation

et al. 2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…The crosstalk [42] is the light intensity leaked to the non-selected output port; in other words, the lights diffracted to other orders, except the first order, and coupled into the non-selected output ports are considered as crosstalk for the system.…”

Section: Crosstalkmentioning

confidence: 99%

LCoS SLM Study and Its Application in Wavelength Selective Switch

et al. 2017

View full text Add to dashboard Cite

Abstract:The Liquid-Crystal on Silicon (LCoS) spatial light modulator (SLM) has been used in wavelength selective switch (WSS) systems since the 1990s. However, most of the LCoS devices used for WSS systems have a pixel size larger than 6 µm. Although there are some negative physical effects related to smaller pixel sizes, the benefits of more available ports, larger spatial bandwidth, improved resolution, and the compactness of the whole system make the latest generation LCoS microdisplays highly appealing as the core component in WSS systems. In this review work, three specifications of the WSS system including response time, crosstalk and insertion loss, and optimization directions are discussed. With respect to response time, the achievements of liquid crystal material are briefly surveyed. For the study of crosstalk and insertion loss, related physical effects and their relation to the crosstalk or insertion loss are discussed in detail, preliminary experimental study for these physical effects based on a small pixel LCoS SLM device (GAEA device, provided by Holoeye, 3.74 µm pixel pitch, 10 megapixel resolution, telecom) is first performed, which helps with predicting and optimizing the performance of a WSS system with a small pixel size SLM. In the last part, the trend of LCoS devices for future WSS modules is discussed based on the performance of the GAEA device. Tradeoffs between multiple factors are illustrated. In this work, we present the first study, to our knowledge, of the possible application of a small pixel sized SLM as a switching component in a WSS system.

show abstract

“…The first column is the distance of the target location from the input optical axis (zero order), and the second column is the calculated ideal period (in terms of pixels). The blazed grating is quantized using a modulo 2π algorithm [30,31]. Therefore the corresponding period is not necessarily an integer number of pixels.…”

Section: Power Response Of Blazed Gratings With Phase Compensationmentioning

confidence: 99%

“…In general, for a small deflection angle, a large grating period is required. Gil-Leyva et al [31] showed that there is a limit when the number of periods displayed in a phase SLM will no longer be sufficient to obtain an optimum diffractive performance. Thus, the resulting diffraction orders will not be cleanly formed, and the power and position of the first order will begin to vary as the grating period is reduced.…”

Section: Power Response Of Blazed Gratings With Phase Compensationmentioning

confidence: 99%

Diffraction based phase compensation method for phase-only liquid crystal on silicon devices in operation

et al. 2012

Self Cite

View full text Add to dashboard Cite

A method to measure the optical response across the surface of a phase-only liquid crystal on silicon device using binary phase gratings is described together with a procedure to compensate its spatial optical phase variation. As a result, the residual power between zero and the minima of the first diffraction order for a binary grating can be reduced by more than 10 dB, from -15.98 dB to -26.29 dB. This phase compensation method is also shown to be useful in nonbinary cases. A reduction in the worst crosstalk by 5.32 dB can be achieved when quantized blazed gratings are used.

show abstract

Cross-talk analysis in a telecentric adaptive free-space optical relay based on a spatial light modulator

Cited by 15 publications

References 19 publications

Use of wavefront encoding in optical interconnects and fiber switches for cross talk mitigation

Use of wavefront encoding in optical interconnects and fiber switches for cross talk mitigation

LCoS SLM Study and Its Application in Wavelength Selective Switch

Diffraction based phase compensation method for phase-only liquid crystal on silicon devices in operation

Contact Info

Product

Resources

About