Design of equalized ROADMs devices with flexible bandwidth based on LCoS technology

Mora, M.; Minguez, Alfredo Martín; Horche, Paloma R.

doi:10.1109/noc.2014.6996825

Cited by 4 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A digital pulse width modulation scheme is used in current displays as the driving sequence for representing different gray levels [47,48]. Due to the finite viscosity of the LC molecules, the time-averaged voltage is observable for LC molecules, which is related to phase representation; however, the superimposed pulse modulation pattern produces certain fluctuation in the orientation of the LC molecules, which leads to the flicker [49] on the beam of light.…”

Section: Phase Flickermentioning

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

Section: Phase Flickermentioning

confidence: 99%

LCoS SLM Study and Its Application in Wavelength Selective Switch

et al. 2017

View full text Add to dashboard Cite

show abstract

“…This fact will limit their applications in future optical networks. In order to make them suitable for using in future flexible-grid optical networks, programmable optical filters based on Liquid Crystal on Silicon (LCoS) technology are widely studied and used for WSS in recent years [13,22,23]. This has been due to their high-flexibility, high-resolution, high-efficiency and low-cost.…”

Section: Programmabilitymentioning

confidence: 99%

“…In addition, spectral modeling of Liquid Crystal on Silicon (LCoS) based programmable optical filters have been looked into by Pulikkaseril et al (Finisar) [11,12], where filter shape of an error function-based model was studied. In [13], a ROADM with flexible bandwidth based on LCoS technology is presented, where the spectral function at -3 dB is approximated by a Gaussian filter and its tails by a Bessel filter.…”

Section: Introductionmentioning

confidence: 99%

Signal penalties induced by different types of optical filters in 100Gbps PM-DQPSK based optical networks

Pereda

Horche

2016

Optical Switching and Networking

View full text Add to dashboard Cite

Keywords:Optical filter Optical crosstalk Signal impairment Optical communication Polarization multiplexed differential quadrature phase shift keying (PM-DQPSK) Optical filters are crucial elements in optical communication networks. However, they seriously affect the signal quality, especially in the concatenation condition. In this paper, we study and simúlate the signal penalties induced by five types of filters, including Butterworth, Gaussian, Bessel, Fiber Bragg Grating (FBG) and Fabry-Perot (F-P) filters, in order to optimize the optical network performance. Signal penalties, including both filter concatenation effect and filter induced in-band and out-band crosstalk, are analyzed by eye opening penalty (EOP) and Q-penalty. Simulation results show that the Butterworth filter performs best among these four types of filters. Total Q-penalty induced by a Butterworth filter-based demultiplexer/multiplexer pair, considering both filter concatenation effect and crosstalk, is lower than 0.5 dB, when the filter bandwidth is in the range of 42-46 GHz. Simulations done in a 100 Gbps PM-DQPSK optical network indícate that the permitted cascaded number is 14 and 10 with respect to the case of filters aligned and misaligned, respectively. Penalties induced by láser frequency shift are investigated and the performance of the 3rd-order Butterworth filter is compared to the 4th-order superGaussian filter. Finally, discussions of optical filter performances, including insertion loss, reconfigurability and programmability, are presented.

show abstract

Performance evaluation of 100 and 200-Gb/s WDM PM-QPSK transmission systems: tolerance analysis to the optical link impairments according to the optical carrier shape

Macho

Horche

2018

Opt Rev

View full text Add to dashboard Cite

Design of equalized ROADMs devices with flexible bandwidth based on LCoS technology

Cited by 4 publications

References 3 publications

LCoS SLM Study and Its Application in Wavelength Selective Switch

LCoS SLM Study and Its Application in Wavelength Selective Switch

Signal penalties induced by different types of optical filters in 100Gbps PM-DQPSK based optical networks

Performance evaluation of 100 and 200-Gb/s WDM PM-QPSK transmission systems: tolerance analysis to the optical link impairments according to the optical carrier shape

Contact Info

Product

Resources

About