Integrated EOM looks good for intrachip optical interconnects

With their high speed and low power requirements, optical interconnects will someday provide the ultimate form of communication between components on a silicon microprocessor chip. However, this will only happen when microphotonic components and networks can be fabricated using processes that meld well with those for microelectronics. Researchers at Cornell University (Ithaca, NY) have figured out a way to fabricate one vital photonic component, a silicon high-speed waveguide integrated electro-optic modulator (EOM), in a microphotonics-friendly manner. While previous devices were made on single-crystal silicon-on-insulator wafers (not a good platform for combined photonics and electronics), the new EOM is fabricated on a film of silicon that can be deposited atop the electronics layer.

In the prototype, a p+-n--n+ diode was embedded around a polysilicon ring resonator evanescently coupled into an adjacent waveguide, enabling subnanosecond optical modulation. Fabrication was using standard microelectronic processes. The polysilicon grain boundaries and defects decreased the carrier-combination lifetime and thus sped up the modulator when compared to a single-crystalline device. The researchers measured a 2.5 Gbit/s modulation speed and a 10 dB modulation depth, with an estimated 6 dB insertion loss, a power consumption of 2.4 mW, and an energy consumption of 950 fJ/bit. An improved version should reach a speed of tens of Gbit/s and an insertion loss near 0 dB. Contact Michal Lipson at lipson@ece.cornell.edu.

Most Popular Articles

Webcasts

Femtosecond Lasers – Getting the Photons to the Work Area

Ultrashort-pulse lasers, both picosecond and femtosecond, are now available from a large number of manufacturers, with new players entering the field at a ra...

Ray Optics Simulations with COMSOL Multiphysics

The Ray Optics Module can be used to simulate electromagnetic wave propagation when the wavelength is much smaller than the smallest geometric entity in the ...

Multichannel Spectroscopy: Technology and Applications

This webcast, sponsored by Hamamatsu, highlights some of the photonic technology used in spectroscopy, and the resulting applications.

Handheld Spectrometers

Spectroscopy is a powerful and versatile tool that traditionally often required a large and bulky instrument. The combination of compact optics and modern pa...

Opportunities in the Mid-IR

The technology for exploiting the mid-IR is developing rapidly:  it includes quantum-cascade lasers and other sources, spectroscopic instruments of many...
White Papers

Accurate LED Source Modeling Using TracePro

Modern optical modeling programs allow product design engineers to create, analyze, and optimize ...

Miniature Spectrometers for Narrowband Laser Characterization

In less than 60 years, lasers have transformed from the imagined “ray gun” of science fiction int...

Improve Laser Diode Performance by Reducing Output Cable Inductance using Twisted Pair Cable

The intent of this article is to provide information regarding the performance of twisted pair ca...
Technical Digests

REMOTE FIBER-OPTIC SENSING: Data in abundance from difficult environments

The use of optical fibers to measure strain, temperature, and other parameters at desired points ...

SCANNERS FOR MATERIALS PROCESSING: Serving demanding applications

Galvanometer-based scanners are an essential component in laser-based materials-processing system...

OPTICAL COATINGS: Evolving technology produces new benefits

The antireflection, high-reflection, and/or spectral characteristics provided by optical coatings...

FREEFORM OPTICS: Top-notch capabilities lead to expanded possibilities

The use of free-form aspherical surfaces in an optical system can give it abilities impossible to...

Click here to have your products listed in the Laser Focus World Buyers Guide.

PRESS RELEASES

SCHOTT and Applied Microarrays Establish Distribution Partnership for NEXTERION® Products

01/22/2013 SCHOTT and Applied Microarrays, Inc. have established a partnership for the distribution of SCHOT...

SCHOTT North America and Space Photonics, Inc. Sign Exclusive Licensing Agreement for Covert Communications Technology

01/22/2013 WASHINGTON, D.C.—October 18, 2012—Space Photonics Inc. and SCHOTT North America, Inc. today annou...
Social Activity
  •  
  •  
  •  
  •  
Copyright © 2007-2015. PennWell Corporation, Tulsa, OK. All Rights Reserved.PRIVACY POLICY | TERMS AND CONDITIONS