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Optical Isolators provide lasers with immunity from back-reflection, thereby improving the signal to noise ratio for laser diode based transmitters. This is especially important for high data rate transceivers and transponders, or those devices requiring long span lengths between transceiver pairs. All of our isolators are based on dichroic polarizing glass and Faraday rotating crystals for highest performance. These devices are available in a single stage, 1.5 stages, or double stages, with multiple stages providing progressively higher isolation.
LightPath offers isolators in various form factors including: Cylindrical, Surface-Mount, and Sub-Mount. In addition, we manufacture isolators with either an epoxy-free optical path or with a laminated core. The primary benefits of our approach to manufacturing include reduced costs as a result of higher yields, throughput and product consistency as a result of automation. LightPath is capable of delivering a total solution to its OEM customers, from prototype and development contracting through high-volume production.
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Analog Optoisolators
PerkinElmer Optoelectronics, a leading manufacturer of analog optical isolators (AOI) for over twenty years, makes a broad range of standard parts under its trademark VACTROL®.
There are many kinds of optical isolators, but the most common is the LED/phototransistor type. Other familiar types use output elements such as light sensitive SCRs, Triacs, FETs and ICs. The major application for these silicon based devices is to provide electrical isolation of digital lines connected between different pieces of equipment. The principle of operation is very simple. When an input current is applied to the LED, the output phototransistor turns on. The only connection between the LED and phototransistor is through light - not electrically, thus the term optical isolator. These optical isolators are primarily digital in nature with fast response times for interfacing with logic gates. Rise and fall times of a few microseconds, faster for some isolators, are typical.
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Channel Photomultiplier
The CPD is based on the latest detector generation. Five different photomultipliers are available for spectral ranges from 165 nm up to 850 nm. The unique design makes it possible to achieve extremely low dark count rates while getting high amplification at the same time. In contrast to conventional photomultipliers, no resistor chain is necessary. Therefor electronically generated noise is minimized. The electrons are amplified in the spiral channel, where the impressed high voltage is evenly distributed.
Characteristics
- Extensive dynamic area
- Fast signal response
- High amplification
- High sensitivity
- Spectral range: 165 nm to 850 nm
- Compact, rugged aluminum casing
- Flange installation on common spectrometer systems
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The photomultiplier provides extremely high sensitivity and ultra-fast response. Photomultiplier tubes (PMT) have high bandwidth and noise-free gain on the order of a million. This makes them ideal for the detection of extremely low light or short pulses of light. Photomultipliers can be used to detect photons from 115nm to 1700nm. A typical Photomultiplier consists of a photoemissive cathode (photocathode) followed by an electron multiplier and an electron collector (anode).
Hamamatsu offers the most complete range of head-on and side-on photomultiplier tubes from 3/8" to 20" in diameter.
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Fiber optics signal processing 
