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International Conference on Photonics in Switching

High bandwidth optical packet switching using holeburning materials at wavelengths up to 1.55 μm

Xiao A. Shen, Y. Zhang, Ravinder Kachru

Published Jan 1, 1997• 0 citations
Publisher

Abstract

Packet switching has emerged as a promising networking technique capable of supporting a wide range of communications services, such as voice, video, image and data.1,2 However, implementation of this technique at optical carrier frequencies, especially at the communication wavelengths, to fully utilize the wide transmission bandwidth offered by fiber optic technologies remains a challenge. Impediments to the development includes: i) the inability to rapidly analyze temporal optical information contained in the header of each packet for efficient routing, ii) rapid data processing and buffering at the communication wavelengths. Most optical switches proposed earlier suffer from either insufficient memory capacity for storing reference information, slow processing speed for routing at required packet rates, or the requirement of wavelength conversions.

DOI
10.1364/ps.1997.pthc2

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The ability to manipulate the speed of light has recently become one of the most exciting emergent topics in optics. There are several experimental demonstrations showing the capability to slow down light more than six orders of magnitude in a variety of media, ranging from atomic vapor, solid state crystal, to semiconductors. These results have led to intensive research into new materials, devices, and system studies that examine their impact to new applications. It is believed that we are on the verge of a dramatic change in the way we envision and construct communication, processing and control systems. One direct application of slow and fast light devices is in the area of communications. One grand challenge remaining in information technology today is to store and buffer optical signals directly in optical format. As such, optical signals must be converted to electronic signals to route, switch, or be processed. This resulted in significant latencies and traffic congestions in current networks. In addition, keeping the data in optical domain during the routing process can greatly reduce the power, complexity and size of the routers. To this end, a controllable optical delay line can effectively function as an optical buffer, and the storage is proportional to the variability of the group velocity. In addition to optical buffers, slow and fast light devices can be used as tunable true-time delay elements in microwave photonics, which are important for remotely controlling phased array antenna. Other novel applications include nonlinear optics, optical signal processing, and quantum information processing. There are various approaches that can be used to vary the optical group velocity. Ultraslow or fast group velocity may result from a large material dispersion, waveguide dispersion, or both. In this paper, the authors provide a review of recent progress of slow and fast light using semiconductor devices. Specifically, they will discuss results obtained using semiconductor quantum-well/quantum-dot absorber and optical amplifiers. Slow and fast light are controllable electrically by changing the bias current or voltage as well as optically by changing the pump laser intensity and wavelength. Delay-bandwidth tradeoff and other figures of merits are analyzed

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Packet switching has emerged as a promising networking technique capable of supporting a wide range of communications services, such as voice, video, image and data.1,2 However, implementation of this technique at optical carrier frequencies, especially at the communication wavelengths, to fully utilize the wide transmission bandwidth offered by fiber optic technologies remains a challenge. Impediments to the development includes: i) the inability to rapidly analyze temporal optical information contained in the header of each packet for efficient routing, ii) rapid data processing and buffering at the communication wavelengths. Most optical switches proposed earlier suffer from either insufficient memory capacity for storing reference information, slow processing speed for routing at required packet rates, or the requirement of wavelength conversions.
Packet switches or routers are key items of Internet infrastructure. Routers orchestrate the movement of Internet protocol (IP) packets through the network, and ensure that each packet is forwarded from its source to its correct destination. In today’s network, routers are highly sophisticated electronic systems, based on powerful electronic processing, switching, and buffering technologies [1,2]. Incoming packets arrive at the import ports of a router via optical fiber links and are converted to electronic form before entering the router. This conversion is achieved using optical-to-electronic (O/E) converters located at the inputs to the router. Similarly, outgoing packets from the router pass through E/O converters before being launched onto the next optical fiber transmission link in the network.
We are developing a high density, high speed optical memory, using rare-earth doped hole- burning materials. These materials are theoretically capable of achieving storage densities of 1000 Gigabits/cm3 at input/output (I/O) rates of several gigabits/sec. One remarkable attribute of this storage concept is that both the temporal and spatial information encoded on a laser beam can be stored. Because both the temporal and spatial information can be stored, digital data can be recorded serially as a data or packet stream as well as holographically using the page format. During the past year we have achieved a breakthrough in demonstrating random access holographic data storage at high frame rates. Five hundred holograms were stored and retrieved with very good fidelity at 30 Hz (video rate). Each holographic image with 512 multiplied by 488 pixels could be randomly accessed during the storage and retrieval process. This frame rate is the highest demonstrated frame rate for any optical technique. This breakthrough was achieved through the invention of a memory architecture that allows multiple holographic frames to be stored without any mechanical beam scanning. In this new architecture multiplexing of 500 holograms was achieved by stepping the laser frequency over a range covered by high speed acousto-optic modulators (AOM).
Abstract : Optical materials for spectral hole burning and coherent transient applications were designed and evaluated, emphasizing relevance to devices including high performance memory, signal processing, high speed holographic recording and analysis, and optical switches, routers, and buffers. The ultimate limits on material performance set by atomic mechanisms were determined. The developed materials contained Eu3+, Pr3+, Tm3+, Tb3+, or Er3+ active ions in various oxide hosts. The first report was made of an Er3+ material for hole burning applications in 1.5 micron optical communications bands. Eight Er3+ materials for applications at 1.5 microns in optical routers and buffer memories were designed and characterized. A correlator' signal processing capability was demonstrated, and the first report was made of operation of a 1.5 micron packet header decoder for all-optimized optical packet switching in optical communications along optical fibers at 1531 nm. Eu3+:Y2SiO5 was optimized for use in 100 GByte ODRAM optical memory devices, considering Eu3+ concentration and temperature. Eight Tm3+ compounds for signal processing applications, such as true time delays for phased-array radar, at diode laser wavelengths near 795 nm were designed and characterized. Eight Tb3+ compounds for photon gated spectral hole burning were designed and characterized, and gated hole burning was observed in Tb3+:YAIO3.
The ability to manipulate the speed of light has recently become one of the most exciting emergent topics in optics. There are several experimental demonstrations showing the capability to slow down light more than six orders of magnitude in a variety of media, ranging from atomic vapor, solid state crystal, to semiconductors. These results have led to intensive research into new materials, devices, and system studies that examine their impact to new applications. It is believed that we are on the verge of a dramatic change in the way we envision and construct communication, processing and control systems. One direct application of slow and fast light devices is in the area of communications. One grand challenge remaining in information technology today is to store and buffer optical signals directly in optical format. As such, optical signals must be converted to electronic signals to route, switch, or be processed. This resulted in significant latencies and traffic congestions in current networks. In addition, keeping the data in optical domain during the routing process can greatly reduce the power, complexity and size of the routers. To this end, a controllable optical delay line can effectively function as an optical buffer, and the storage is proportional to the variability of the group velocity. In addition to optical buffers, slow and fast light devices can be used as tunable true-time delay elements in microwave photonics, which are important for remotely controlling phased array antenna. Other novel applications include nonlinear optics, optical signal processing, and quantum information processing. There are various approaches that can be used to vary the optical group velocity. Ultraslow or fast group velocity may result from a large material dispersion, waveguide dispersion, or both. In this paper, the authors provide a review of recent progress of slow and fast light using semiconductor devices. Specifically, they will discuss results obtained using semiconductor quantum-well/quantum-dot absorber and optical amplifiers. Slow and fast light are controllable electrically by changing the bias current or voltage as well as optically by changing the pump laser intensity and wavelength. Delay-bandwidth tradeoff and other figures of merits are analyzed