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Silicon Photonics

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Definition: photonic technology based on silicon chips

German: Silizium-Photonik

For applications in microelectronics, an extremely powerful technology platform based on silicon chips has been developed in the recent decades. This is now the basis of complex microprocessors, large memory circuits, and other digital and analog electronics. With the introduction of the silicon-on-insulator technology [3] it has been demonstrated that photonic functions can be integrated into this technology platform, so that silicon-based photonic integrated circuits became possible. Here, different kinds of optical components can be connected with each other using silicon waveguides [1]. Such circuits could be used e.g. to establish very fast communication between circuit boards, between chips on a board, or even within single chips, e.g. connecting different cores of a microprocessor. There is a strong need for such fast communication links, because the rapid progress of microprocessors may soon be severely limited by the transmission bandwidth capabilities of electronic connections, made e.g. of copper. Optical data transmission allows for much higher data rates and would at the same time eliminate problems resulting from electromagnetic interference. The technology may also be useful for other areas of optical communications, such as fiber to the home.

Silicon photonics can also be considered from the viewpoint of photonics, which is so far normally based on other materials. (Silica = amorphous SiO2 is common in photonics, e.g. in silica fibers, but not elementary silicon.) The implementation of silicon-based photonic devices, maybe even electrically pumped silicon lasers and silicon amplifiers, could possibly lead to much smaller and much cheaper photonic devices, making accessible a range of applications which so far have been impossible already for reasons of too high cost.

Technological Challenges

Although the possible merits of silicon-based photonics are huge, there are also very substantial challenges for such a technology:

It is possible to fabricate hybrid devices where the photonic functions are provided by structures made of III–V semiconductors (with a direct bandgap and electro-optic properties), such as indium phosphide, and these are placed on a silicon chip containing the bulk of the electronic components. One class of techniques is based on epitaxial regrowth procedures, which are complicated and often greatly reduce the yield. For that reason, hybrid devices tend to be expensive and are strongly limited in complexity. Another approach is to apply a sophisticated bonding process to combine a silicon chip containing waveguides with an indium phosphide chip providing the optical gain [17]. Still, all-silicon solutions, arising from the “siliconization of photonics”, would probably be more suitable for widespread application.

State of Research

The following paragraphs briefly describe the current state of research concerning basic building blocks of silicon photonics:

It is clear that an enormous amount of work, corresponding to huge capital investments, is still required before silicon photonics can be established as a key technology. However, the potential merits motivate big players such as Intel to pursue this development seriously. If it is successful, it can lead to a very powerful technology with huge benefits for photonics and microelectronics and their applications.

Bibliography

[1]R. A. Soref and J. P. Lorenzo, “Single-crystal silicon: a new material for 1.3 and 1.6 μm integrated-optical components”, Electron. Lett. 21 (21), 953 (1985)
[2]B. Schüppert et al., “Optical channel waveguides in silicon diffused from GeSi allow”, Electron. Lett. 25 (22), 1500 (1989)
[3]M. Bruel, “Silicon on insulator material technology”, Electron. Lett. 31 (14), 1201 (1995)
[4]B. Jalali et al., “Advances in silicon-on-insulator optoelectronics”, IEEE J. Sel. Top. Quantum Electron. 4 (6), 938 (1998)
[5]D. A. B. Miller, “Optical interconnects to silicon”, IEEE J. Sel. Top. Quantum Electron. 6 (6), 1312 (2000)
[6]Online publications by Intel, see http://www.intel.com/go/sp/
[7]V. R. Almeida et al., “Nanotaper for compact mode conversion”, Opt. Lett. 28 (15), 1302 (2003)
[8]H. Rong et al., “A continuous-wave Raman silicon laser”, Nature 433, 725 (2005)
[9]G. T. Reed, “Device physics: The optical age of silicon”, Nature 427, 595 (2004)
[10]A. Liu et al., “A high speed silicon optical modulator based on a metal–oxide semiconductor capacitor”, Nature 427, 615 (2004)
[11]O. Boyraz and B. Jalali, “Demonstration of a silicon Raman laser”, Opt. Express 12 (21), 5269 (2004)
[12]L. Liao et al., “High speed silicon Mach–Zehnder modulator”, Opt. Express 13 (8), 3129 (2005)
[13]L. Liao et al., “Tensile strained Ge p–i–n photodetectors on Si platform for C and L band telecommunications”, Appl. Phys. Lett. 87, 11110 (2005)
[14]Y.-H. Kuo et al., “Strong quantum-confined Stark effect in germanium quantum-well structures on silicon”, Nature 437, 1334 (2005)
[15]B. Jalali et al., “Raman-based silicon photonics”, IEEE J. Sel. Top. Quantum Electron. 12 (3), 412 (2006)
[16]H. Rong et al., “Monolithic integrated Raman silicon laser”, Opt. Express 14 (15), 6705 (2006)
[17]A. W. Fang et al., “Electrically pumped hybrid AlGaInAs-silicon evanescent laser”, Opt. Express 14 (20), 9203 (2006)
[18]H. Rong et al., “Low-threshold continuous-wave Raman silicon laser”, Nature Photon. 1 (4), 232 (2007)
[19]Q. Xu et al., “12.5 Gbit/s carrier-injection-based silicon micro-ring silicon modulators”, Opt. Express 15 (2), 430 (2007)
[20]B. Jalali, “Teaching silicon new tricks”, Nature Photon. 1 (4), 193 (2007)
[21]V. Raghunathan et al., “Demonstration of a mid-infrared silicon Raman amplifier”, Opt. Express 15 (22), 14355 (2007)
[22]H. Rong et al., “A cascaded silicon Raman laser”, Nature Photon. 2, 170 (2008)
[23]J. Liu et al., “Waveguide-integrated, ultralow-energy GeSi electro-absorption modulators”, Nature Photon. 2, 433 (2008)
[24]S. Manipatruni et al., “Wide temperature range operation of micrometer-scale silicon electro-optic modulators”, Opt. Lett. 33 (19), 2185 (2008)
[25]J. Liu et al., “Ge-on-Si laser operating at room temperature”, Opt. Lett. 35 (5), 679 (2010)
[26]Special Issue on silicon photonics in IEEE Sel. Top. Quantum Electron. 16 (1) (2010)
[27]SiCoud, a silicon photonics calculator developed at UCLA, http://www.sicloud.org/

See also: photonics, photonic integrated circuits, integrated optics, optoelectronics, Raman lasers, amplifiers, optical modulators

Category: photonic devices


Dr. R. Paschotta

This encyclopedia is authored by Dr. Rüdiger Paschotta, the founder and executive of RP Photonics Consulting GmbH. Contact this distinguished expert in laser technology, nonlinear optics and fiber optics, and find out how his technical consulting services (e.g. product designs, problem solving, independent evaluations, or staff training) and software could become very valuable for your business!

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