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Communications Features
Photodetectors Test Pulsed Laser Diodes
Given that packaging adds 80 percent or more to the cost of a laser diode module, it is imperative to ensure that only good laser diode chips enter communications modules. This requires testing laser diodes at the bar or chip stage with pulse techniques that prevent destructive self-heating of uncooled devices. These techniques drive the diodes using pulsed current sources with fast rise times. Photodetectors, generally PIN detectors with fast response times, accurately measure the...
Photonics Spectra, December 2002
Better Test Systems Boost Laser Diode Performance
Semiconductor laser diodes have taken the laser market by storm, in part because of their operating efficiency and compactness. They have several unique characteristics, though, that must be considered in their application (Figure 1). These include...
Photonics Spectra, October 2002
Detecting Contaminated Poultry
If you live in the US, chances are you’re having chicken for dinner tonight. A significant percentage of that chicken is probably contaminated with pathogens, so governmental agencies and the industry monitor the inspection line to determine...
Photonics Spectra, October 2002
Microelectromechanical Systems
Researchers in academic and industrial laboratories are harnessing the power of microelectromechanical systems (MEMS) for use in tunable lasers, optical routers, variable optical attenuators, adaptive optics, displays and other devices.Some of these...
Photonics Spectra, October 2002
Hard Photonics Problems Require Soft Solutions
Increasingly inexpensive computing solutions are enabling users to reconfigure their instruments and to manipulate data as never before, overcoming the constraints of hardware to optimize photonic applications. When a photonics problem is too...
Photonics Spectra, September 2002
Machining Advances Lead to Multifunctional Optics
Today’s optical systems usually serve a variety of functions simultaneously, resulting in ever-more-complex subsystems with increasingly critical requirements related to performance, precision, robustness and miniaturization. More...
Photonics Spectra, September 2002
Widely Tunable Lasers Ready to Lock and Roll
In the ’90s, visions of the all-optical network danced merrily in the heads of the world’s telecommunications service and equipmentproviders. Now the optical components necessary to transform that all-optical fantasy into a reality are...
Photonics Spectra, September 2002
Optical Coatings Reap the Benefits of Telecommunications
Over the last five years, the optical coating industry has been revolutionized to meet the challenges of producing the dense wavelength division multiplexing (DWDM) filters for telecommunications that separate the wavelength channels used in optical...
Photonics Spectra, August 2002
Lateral-Scanning Interferometry Takes the Long View
Semiconductor, data storage, optical telecommunications and microelectromechanical systems (MEMS) applications often require surface measurement across relatively large areas with nanometer resolution. With rising demand for smaller form factors and...
Photonics Spectra, July 2002
Photonic Crystals
Photonic bandgap crystals serve as a microcosm of the photonics industry: Although microscopic in structure, their versatility in manipulating photons could have a huge and pervasive impact on nearly all optical components and instrumentation,...
Photonics Spectra, June 2002
Modeling Telecommunications Components
The term "crosstalk" describes the phenomenon of power leaking from one channel of a wavelength division multiplexing (WDM) system into a neighboring one. One of the most important design issues for optical communications systems, crosstalk can...
Photonics Spectra, May 2002
Not All Multiplexing Technologies Are on the Same Wavelength
Until recently, the development of dense wavelength division multiplexing (DWDM) technology has focused solely on scaling to higher channel counts, following pundits’ predictions that future high-bandwidth applications would create a bandwidth...
Photonics Spectra, May 2002
Optical Fiber
At the beginning of 2001, manufacturers of optical fiber couldn’t make the stuff fast enough. By midyear, the economic boom’s bubble had burst, and the world’s leading suppliers began applying the brakes to their global fiber...
Photonics Spectra, April 2002
Optical Power Meters
Despite the downturn in the telecommunications industry, traffic volume continues to grow. Network providers will need additional capacity, and equipment designers must continue to push system limits toward higher bit rates and denser channel...
Photonics Spectra, April 2002
Polyphenyl Ethers
These short-chain cyclic compounds are linked by oxygen atoms. A characteristic formulation has two to eight aromatic groups, or rings, allowing PPEs to retain their chemical and performance stability against ionizing radiation, thermal excursions,...
Photonics Spectra, April 2002
Automating Optoelectronics Manufacturing
The financial situation confronting the optical networking industry is placing new demands on the companies that supply it with advanced optoelectronic components. Because of the recent slowdown in spending, carriers are looking for ways to maximize...
Photonics Spectra, March 2002
Specifying Injection-Molded Plastic Optics
The use of plastic optics continues to grow in popularity as optical design engineers discover the many ways these components can manage light. Plastic optical elements and systems appear in a wide spectrum of industrial and medical applications,...
Photonics Spectra, March 2002
Broadband Gain Chips
Telecommunications requirements such as dynamic provisioning, channel protection, wavelength conversion and the replacement of fixed-wavelength distributed feedback lasers are driving the adoption of tunable laser sources. External-cavity lasers...
Photonics Spectra, February 2002
Planar Optical Integration
Since the beginning of the most recent boom in the optical fiber industry, component vendors have introduced many technologies, among them planar optical integration, in which optical circuits are constructed out of waveguides fabricated on silicon...
Photonics Spectra, February 2002
Staff Report: A Leaner, Meaner Job Market for Photonics Engineers
At the close of 2001, the photonics job market found itself 180 degrees from where it had been at the end of 2000. Employers hold all the cards in this new environment, and those sign-on bonuses and stock options that were once commonplace are now...
Photonics Spectra, February 2002
Applications Will Bolster the Industrial Laser Market
According to analysts, the worldwide market for the laser sources and systems used in industrial materials processing has shown, on average, double-digit annual growth over the past five years. This trend should continue over the next few years,...
Photonics Spectra, January 2002
Automated Metrology and Inspection
The 2001 downturn in telecommunications has significantly affected component manufacturers and carriers alike. One result has been a substantial decrease in capital equipment spending as companies position themselves for a period of slow...
Photonics Spectra, January 2002
Deposition Systems: Meeting the Demands
The key to growing the market for vacuum deposition equipment is in meeting the demands that drive it: higher throughput, enhanced automation and more precise control of layer thickness.The focus of these demands includes dense wavelength division...
Photonics Spectra, January 2002
Diversity Powers Laser Market
In the past few years, telecommunications has received enormous attention in the laser industry and in the photonics press. While telecom applications continue to offer tremendous long-term potential for laser manufacturers, market diversity remains...
Photonics Spectra, January 2002
Optical Network Components
Since 1999, the fiber component industry has shifted its developmental resources from volume production of leading-edge components to delivering the best component value for the equipment manufacturer’s dollar.This shift lies at the confluence...
Photonics Spectra, January 2002
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May 2024
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