Slow light with low dispersion and nonlinear enhancement in a lattice-shifted photonic crystal waveguide

Hamachi, Yohei; Kubo, S.; Baba, Toshihiko

doi:10.1364/ol.34.001072

Cited by 180 publications

(115 citation statements)

References 14 publications

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“…To broaden the operating optical bandwidth of PCW modulators, lattice shifted PCWs can be employed, where the spatial shift of certain holes can modify the structure to provide low-dispersion slow light [11][12][13][14][15].…”

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Wide optical spectrum range, subvolt, compact modulator based on an electro-optic polymer refilled silicon slot photonic crystal waveguide

et al. 2013

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We design and demonstrate a compact and low-power band-engineered electro-optic (EO) polymer refilled silicon slot photonic crystal waveguide (PCW) modulator. The EO polymer is engineered for large EO activity and near-infrared transparency. A PCW step coupler is used for optimum coupling to the slow-light mode of the band-engineered PCW. The half-wave switching-voltage is measured to be Vπ=0.97±0.02V over optical spectrum range of 8nm, corresponding to the effective in-device r33 of 1190pm/V and Vπ×L of 0.291±0.006V×mm in a push-pull configuration. Excluding the slow-light effect, we estimate the EO polymer is poled with an efficiency of 89pm/V in the slot. [6]. The fabrication process of these devices involves the poling of the EO polymer at an elevated temperature. Unfortunately, the leakage current due to the charge injection through silicon/polymer interface significantly reduces the poling efficiency in narrow slot waveguides (slot width, S w <200nm). Among the abovementioned structure, the slot PCW can support optical mode for S w as large as 320nm [7]. Such a wide slot was shown to reduce the leakage current by two orders of magnitude resulting in 5х improvement in the in-device r 33 compared to a slot PCW with S w =75nm [7].One problem remains among slot PCW modulators is their narrow operating optical bandwidth of <1nm [8][9][10] because of the high group velocity dispersion (GVD) in the slow-light optical spectrum range. To broaden the operating optical bandwidth of PCW modulators, lattice shifted PCWs can be employed, where the spatial shift of certain holes can modify the structure to provide low-dispersion slow light [11][12][13][14][15].In this letter we report a symmetric MZI modulator based on band-engineered slot PCW refilled with EO polymer, SEO125 from Soluxra, LLC. SEO125 exhibits exceptional combination of large EO activity, low optical loss, and good temporal stability. Its r 33 value of poled thin films is around 125pm/V at the wavelength of 1310 nm, which is measured by the Teng-Man reflection technique. The design and synthesis of SEO125 encompasses recent development of highly efficient nonlinear optical chromophores with a few key molecular and material parameters, including large β values, good near-infrared transparency, excellent chemicaland photo-stability, and improved processability in polymers [16]. Using a band-engineered EO polymer refilled slot PCW with S w =320nm, we demonstrate a slow-light enhanced effective in-device r 33 of 1190pm/V over 8nm optical spectrum range. Excluding the slow-light effect, we estimate in-device material' r 33 of 89pm/V for SEO125 in the slot that show 51% improvement compared to the results (59pm/V) in [7]. A schematic of the device on silicon on insulator (SOI) (Si thickness=250nm, oxide thickness=3μm) is shown in Fig. 1 (a). The input and output strip waveguides are connected to the device using a strip-to-slot waveguide mode converter. PCW couplers consisting of a fast-light section [17] connect the mode converters to a 300μm-long slow-ligh...

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Wide optical spectrum range, subvolt, compact modulator based on an electro-optic polymer refilled silicon slot photonic crystal waveguide

et al. 2013

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“…The ability to generate a prescribed dispersion function, also referred as dispersion engineering [4,5], is a more demanding goal. By offering many degrees of freedom in the design, photonic crystals (PhC) fibers [6] and waveguides [7,8,9,4,10] have proven to enable dispersion engineering.…”

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Control of dispersion in photonic crystal waveguides using group symmetry theory

Colman¹,

Combrié²,

Lehoucq³

et al. 2012

Opt. Express

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Abstract:We demonstrate dispersion tailoring by coupling the even and the odd modes in a line-defect photonic crystal waveguide. Coupling is determined ab-initio using group theory analysis, rather than by trial and error optimisation of the design parameters. A family of dispersion curves is generated by controlling a single geometrical parameter. This concept is demonstrated experimentally on a 1.5mm-long waveguide with very good agreement with theory.

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“…11(a), is eective for simplifying this issue. 19) Here, only the third rows of holes from the line defect are slightly shifted by an amount of s from their original positions along with the line defect. Calculated photonic bands for two dierent s/a and measured transmission characteristics for those fabricated into SOI substrate are shown in Fig.…”

Section: Low Dispersion Slow Light and Nonlinear Enhancementmentioning

confidence: 99%

Dispersion-Controlled Slow Light in Photonic Crystal Waveguides

Baba¹,

Sasaki²,

Adachi³

et al. 2009

Advances in Optical Sciences Congress

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Slow light with a markedly low group velocity is a promising solution for optical buering and advanced time-domain optical signal processing. It is also anticipated to enhance linear and nonlinear eects and so miniaturize functional photonic devices because slow light compresses optical energy in space. Photonic crystal waveguide devices generate on-chip slow light at room temperature with a wide bandwidth and low dispersion suitable for short pulse transmission. This paper rst explains the delay-bandwidth product, fractional delay, and tunability as crucial criteria for buering capacity of slow light devices. Then the paper describes experimental observations of slow light pulse, exhibiting their record high values. It also demonstrates the nonlinear enhancement based on slow light pulse transmission.

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Slow light with low dispersion and nonlinear enhancement in a lattice-shifted photonic crystal waveguide

Cited by 180 publications

References 14 publications

Wide optical spectrum range, subvolt, compact modulator based on an electro-optic polymer refilled silicon slot photonic crystal waveguide

Wide optical spectrum range, subvolt, compact modulator based on an electro-optic polymer refilled silicon slot photonic crystal waveguide

Control of dispersion in photonic crystal waveguides using group symmetry theory

Dispersion-Controlled Slow Light in Photonic Crystal Waveguides

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