Use of a dielectric stack as a one-dimensional photonic crystal for wavelength demultiplexing by beam shifting

Nelson, B.E.; Gerken, Martina; Miller, David A. B.; Piestun, Rafael; Lin, Chien-Chung; Harris, James S.

doi:10.1364/ol.25.001502

Cited by 69 publications

(37 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast to typical dielectric interference filters though, we use group velocity effects to separate multiple beams of different wavelengths with a single multilayer structure. These group velocity effects are similar to the superprism effect observed in one-dimensional [1], [2], two-dimensional [1], [3], [4], and three-dimensional [5] photonic crystals. The multilayer thin-film stack is designed such that different wavelengths propagate at different effective group velocity angles as shown in Fig.…”

Section: Avelength-division-multiplexing (Wdm)supporting

confidence: 75%

See 1 more Smart Citation

Wavelength demultiplexer using the spatial dispersion of multilayer thin-film structures

Gerken

Miller

2003

IEEE Photon. Technol. Lett.

View full text Add to dashboard Cite

Abstract-We demonstrate that a single 66-layer nonperiodic thin-film stack can be used to separate four wavelength channels by spatial beam shifting. This device uses group velocity effects similar to the superprism effect observed in photonic crystals, but shows larger and more controlled shifts including constant dispersion allowing for equidistant channel spacing. Experimentally, a nearly linear 100-m shift is achieved between 827 and 841 nm. System considerations are discussed.Index Terms-Dispersive media, nanotechnology, nonhomogeneous media, wavelength-division multiplexing. W AVELENGTH-DIVISION-MULTIPLEXING (WDM) systems create a strong need for compact, cost-effective wavelength multiplexing and demultiplexing devices. We focus here on thin-film structures, since they are easy to fabricate with well-known technology. In contrast to typical dielectric interference filters though, we use group velocity effects to separate multiple beams of different wavelengths with a single multilayer structure. These group velocity effects are similar to the superprism effect observed in one [4], and three-dimensional [5] photonic crystals. The multilayer thin-film stack is designed such that different wavelengths propagate at different effective group velocity angles as shown in Fig. 1, thus demultiplexing different wavelengths by spatial beam shifting. We have previously discussed that nonperiodic thin-film stacks offer superior wavelength splitting characteristics due to the larger design freedom [6]. Here, we present experimental results demonstrating a four-channel wavelength demultiplexer. Furthermore, we discuss the maximum number of channels theoretically possible for the given design.We designed and experimentally tested a 66-layer nonperiodic thin-film stack consisting of alternating layers of SiO ( at 830 nm) and Ta O with a total stack thickness of 13.4 m for operation at an incidence angle of 54 [6]. We choose to operate the stack in reflection as shown in Fig. 1. To prevent reflections off the front of the stack, we used a "tapered" Bragg stack as the starting design [7]. In such a Bragg stack, the periodicity is slowly "turned on" by increasing the amount of high index material in each period. This is equivalent to tapering a surface corrugated structure on the tapered Bragg stack to achieve a design with a linear shift upon reflection as a function of wavelength. A detailed discussion of the physics and design of this structure is given in [6]. Since we operate the dielectric stack at an angle, the device is polarization sensitive. This particular design only works for p-polarization. The designed stack exhibits an 18-m linear shift along the exit interface between 822 and 842 nm for a single reflection [6]. The effective group propagation angle changes from 17 to 46 corresponding to a dispersion of 1.5 /nm. Depending on the application, nonperiodic stacks with very different dispersion values can be designed [6], such that the dispersion of a stack is not on its own a good figure of merit to judge the pe...

show abstract

Section: Avelength-division-multiplexing (Wdm)supporting

confidence: 75%

“…More significant is the total shift, since the number of separable channels is given by the spatial shift divided by the spatial extent per channel . The spatial shift can be increased by performing multiple reflections off the stack [2]. The resulting number of channels is given by (1), where is the number of bounces off the stack:…”

mentioning

confidence: 99%

Wavelength demultiplexer using the spatial dispersion of multilayer thin-film structures

Gerken

Miller

2003

IEEE Photon. Technol. Lett.

View full text Add to dashboard Cite

show abstract

“…In photonic crystal structures, the beam propagation angle can be strongly dependent on wavelength because of group velocity phenomena (see, e.g., Refs. [75]- [80]). With photonic crystal structures, the angle can change nonlinearly with wavelength and the beam form can be distorted, however.…”

Section: A Off-chip Interconnects On Boards and Backplanesmentioning

confidence: 99%

Device Requirements for Optical Interconnects to Silicon Chips

2009

View full text Add to dashboard Cite

Abstract-We examine the current performance and future demands of interconnects to and on silicon chips. We compare electrical and optical interconnects and project the requirements for optoelectronic and optical devices if optics is to solve the major problems of interconnects to future high performance silicon chips. Optics has potential benefits in interconnect density, energy and timing. The necessity of low interconnect energy imposes low limits especially on the energy of the optical output devices, with a ~ 10 fJ/bit device energy target emerging. Some optical modulators and radical laser approaches may meet this requirement. Low (e.g., a few fF or less) photodetector capacitance is important. Very compact wavelength splitters are essential for connecting the information to fibers. Dense waveguides are necessary on-chip or on boards for guided wave optical approaches, especially if very high clock rates or dense WDM are to be avoided. Free space optics potentially can handle the necessary bandwidths even without fast clocks or WDM. With such technology, however, optics may enable the continued scaling of interconnect capacity required by future chips.

show abstract

“…According to this characteristic, PCs can be of wide use; thus, various types of PCs have successively been proposed and devised for photonic applications. (Fleming & Lin, 1999;Imada et al, 1999;Knight, 2003;Krauss et al, 2000;Nelson et al, 2000;Park, 1999). If a defect layer is infiltrated in a PC to disrupt its periodicity, partial defect modes that allow the transmission of photons at specific wavelengths will be generated within the PBG.…”

Section: Concept Of Defect-mode Tunability In a One-dimensional Photomentioning

confidence: 99%

Tunable and Memorable Optical Devices with One-Dimensional Photonic-Crystal/Liquid-Crystal Hybrid Structures

Wu¹,

Lee²

2012

Optical Devices in Communication and Computation

View full text Add to dashboard Cite

Use of a dielectric stack as a one-dimensional photonic crystal for wavelength demultiplexing by beam shifting

Cited by 69 publications

References 6 publications

Wavelength demultiplexer using the spatial dispersion of multilayer thin-film structures

Wavelength demultiplexer using the spatial dispersion of multilayer thin-film structures

Device Requirements for Optical Interconnects to Silicon Chips

Tunable and Memorable Optical Devices with One-Dimensional Photonic-Crystal/Liquid-Crystal Hybrid Structures

Contact Info

Product

Resources

About