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Opto-Electronic Oscillator Using Suppressed Phase Modulation

Phase noise would be much lower than in prior OEOs. NASA’s Jet Propulsion Laboratory, Pasadena, California A proposed opto-electronic oscillator (OEO) would generate a microwave signal having degrees of frequency stability and spectral purity greater than those achieved in prior OEOs. The design of this system provides for reduction of noise levels (including the level of phase noise in the final output microwave signal) to below some of the fundamental limits of the prior OEOs while retaining the advantages of photonic generation of microwaves. Whereas prior OEOs utilize optical amplitude modulation, this system would utilize a combination of optical phase modulation and suppression thereof. The design promises to afford, in the opto-electronic domain, the low-noise advantages of suppression of carrier signals in all-electronic microwave oscillators.

Posted in: Tech Briefs, ptb catchall, Photonics, Briefs

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Alternative Controller for a Fiber-Optic Switch

This controller communicates via a serial instead of a parallel port. NASA’s Jet Propulsion Laboratory, Pasadena, California The figure is a simplified diagram of a relatively inexpensive controller for a DiCon VX (or equivalent) fiber-optic switch — an electromechanically actuated switch for optically connecting one or two input optical fibers to any of a number of output optical fibers. DiCon VX fiber-optic switches are used primarily in research and development in the telecommunication industry. This controller can control any such switch having up to 32 output channels.

Posted in: Tech Briefs, ptb catchall, Photonics, Briefs

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LED Fiberscope

OPTIM Inc. (Sturbridge, MA) introduces the FreedomView™ LED Fiberscope, a handheld, portable inspection device that combines a high intensity LED light source with a flexible insertion shaft that can be fully immersed in water, gasoline, and diesel fuel. The fiberscope provides fast and accurate remote imaging, enabling visual inspections of hard-to-reach places such as car engines, jet engine turbines, and cargo holds.

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Light Pipe Homogenizing Rods

Edmund Optics (Barrington, NJ) announces the release of the TechSpec™ family of light pipe homogenizing rods for OEM illumination needs. The rods use total internal reflection to turn a non-uniform light source into uniform illumination and deliver it to the target site. These rods are ideal for applications where point sources such as LEDs must be combined and made to deliver even lighting.

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5 Megapixel Cameras

EPIX, Inc. (Buffalo Grove, IL) introduces the SV5C10 12-bit color and the SV5M10 12-bit monochrome 5 megapixel 10 fps cameras. These camera systems, which are based on the MT9P001 sensor from Micron, offer both an Electronic Rolling Shutter for maximum frame rates, and a Global Reset Release Shutter for improved sharpness. Other features include windowing, column and row skip modes, snapshot mode, 12-bit dynamic range, and an active programmable array resolution of 2592(H) × 1944(V) pixels. They are externally triggered or free run, compact and rugged, and have a flexible interface cable and software control. The cameras can capture high quality uncompressed video rate sequences to computer memory or hard drive.

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Line Scan Camera

DALSA Corporation (Waterloo, Ontario) has introduced its Spyder 3 CL line scan camera with Camera Link interface. It has broadband responsivity up to 408 DN/(nJ/cm2) enabling low-light applications, and up to 68 kHz line rate for high speed and productivity. High or low speeds of 40 or 80 megapixels per second throughput are also featured. The camera has flat field correction, CDS (Correlated Double Sampling), and is fully programmable. The Spyder 3 CL can be used for applications including glass edge inspection, general purpose web inspection, postal sorting, industrial metrology, pick and place applications, and medical and scientific imaging.

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Ball Lenses

Antireflection (AR) coated ball lenses from Deposition Sciences, Inc. (Santa Rosa, CA) are available in a variety of glass indexes and sizes from 200 microns up to 10.0 mm diameter. They feature transmission values of greater than 99.5 percent in indexes of up to nd 2.0 @ 550 nm. The AR-coated ball lenses are stable over temperature and humidity changes, and are resistant to most chemicals. Meeting or surpassing the rigid Mil-C675 testing standards for severe abrasion, adhesion, humidity and salt fog tests, the ball lenses can be used in fiber to fiber, diode to fiber, and/or fiber to detector coupling tasks.

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