Thin-film-magnet magnetooptic waveguide isolator

Levy, M.; Ilić, Igor; Scarmozzino, R.; Osgood, Richard M.; Wolfe, R.; Gutierrez, C. J.; Prinz, G. A.

doi:10.1109/68.196003

Cited by 32 publications

(7 citation statements)

References 5 publications

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“…Circulators are widely used in fiber-optic interferometries to suppress laser noise and can be integrated with channel add/drop filters in switching applications [6]. In the past decade, the efforts to miniaturize nonreciprocal devices have been focusing on enhanced magneto-optical response in resonators and guided-wave structures [7,8]. Particularly, on-chip optical circulators have been proposed using photonic crystal resonators with overall dimensions at few-wavelength scale [9][10][11][12][13][14][15][16] and nonreciprocal waveguides at hundreds of wavelengths [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Broadband circulators based on directional coupling of one-way waveguides

Qiu¹,

Wang²,

Soljačić³

2011

Opt. Express

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Resonator-based optical circulators are fundamentally bandwidth-limited by their quality factors. We propose a new type of circulator based on directional coupling between one-way photonic chiral edge states and conventional two-way waveguides. The operational bandwidth of such circulators is tied to the bandwidth of the directional waveguide coupler and has the potential for simultaneous broadband operation and small device footprint.

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Section: Introductionmentioning

confidence: 99%

Broadband circulators based on directional coupling of one-way waveguides

Qiu¹,

Wang²,

Soljačić³

2011

Opt. Express

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“…The Faraday-rotation, which is the basis of the nonreciprocal effects, can be enhanced by bismuth substitution. Various kinds of optical isolators have been proposed [1,2,3,4,5,6,7,8,9,10]. Some promising concepts of integrated optical isolators and circulators rely on the nonreciprocal phase shift of TM modes [11,12], which is the difference ∆β = β fw − β bw between the forward and backward propagation constants β fw and β bw of TM modes, respectively.…”

Section: Introductionmentioning

confidence: 99%

Optimized Nonreciprocal Rib Waveguides for Integrated Magneto-Optic Isolators

et al. 1998

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Garnet films of composition (Lu,Bi)3(Fe,Ga,Al)5O12 and (Tm,Bi)3(Fe,Ga)5O12 are grown by liquid-phase epitaxy on [111]-oriented substrates of gadolinium gallium garnet. Ferrimagnetic films with positive or negative Faraday-rotation as well as paramagnetic films with negligible Faraday-rotation are produced by variations of the rare earth ion substitutions. The temperature dependence of Faraday-rotation is fitted with a molecular field model. Optical rib waveguides in single and double layer garnet films with different Faraday-rotations are realized. The nonreciprocal phase shift of the TM0-Mode is studied both theoretically and experimentally at a wavelength of 1.3 μm. Results show that the maximum nonreciprocal effect at room temperature of double layer films with opposite Faraday-rotation is 1.6 times as large as that of comparable single layer waveguides. But, because of the large temperature dependence of the Faraday-rotation of the positive rotating films, these waveguides show a large temperature dependence of the nonreciprocal phase shift. This problem can be avoided if the positive rotating layer is replaced by a paramagnetic layer. Agreement between calculations and measurements is excellent.

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“…[4][5][6] In a nonreciprocal coupler, the difference of the mode interference patterns in the forward and backward directions is used for separating the counterpropagating waves. The main problem of this concept is the requirement to have strongly coupled but spatially well-separated optical channels.…”

Section: Introductionmentioning

confidence: 99%

Integrated optical circulator based on radiatively coupled magneto-optic waveguides

Lohmeyer

1997

Opt. Eng

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In a three-guide coupler with multimode central waveguide, more than two modes of the entire structure participate in the coupling between the outer waveguides. Using a three-mode approximation we found simple conditions for complete power transfer between the outer waveguides: the device length has to match certain multiples of the conventionally defined coupling length. The specific form of the relevant modes allows us to design a magneto-optic isolator or circulator with significantly reduced device length (as compared to the conventional nonreciprocal coupler). The performance of the proposed devices is simulated by propagating-mode calculations. Estimates for admissible fabrication tolerances for the layer thicknesses are presented. © 1997Society of Photo-Optical Instrumentation Engineers.

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Thin-film-magnet magnetooptic waveguide isolator

Cited by 32 publications

References 5 publications

Broadband circulators based on directional coupling of one-way waveguides

Broadband circulators based on directional coupling of one-way waveguides

Optimized Nonreciprocal Rib Waveguides for Integrated Magneto-Optic Isolators

Integrated optical circulator based on radiatively coupled magneto-optic waveguides

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