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Santur Corporation
Santur Corporation developed, manufactured and commercialized tunable lasers as well as parallel array devices and photonic integrated circuits for the telecommunications industry. It was established in November 2000 in Fremont, California initially developing and commercializing the tunable lasers for metro and long-haul dense wavelength-division multiplexing (WDM) systems. The company had a patented a Distributed Feedback Laser (DFB)-array technology, which enabled the manufacture of broadly tunable sources that have the same performance and reliability as fixed DFBs. Santur claimed to have set a new standard in the telecommunications industry with its technology that features a unique combination of high power, wide tunability, stability, Telcordia GR-468 reliability, and value. NeoPhotonics, a California-based company that develops, manufactures, and sells optoelectronic products, acquired Santur in 2011 for $39.2 million. The acquisition allowed NeoPhotonics access to Sant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santur Corporation Logo
The santur (also ''santūr'', ''santour'', ''santoor'') ( fa, سنتور), is a hammered dulcimer of Iranian origins.--- Rashid, Subhi Anwar (1989). ''Al-ʼĀlāt al-musīqīyya al-muṣāhiba lil-Maqām al-ʻIrāqī''. Baghdad: Matbaʻat al-ʻUmmāl al-Markazīyya. History The santur was invented and developed in the area of Iran and Mesopotamia. "The earliest sign of it comes from Assyrian and Babylonian stone carvings (669 B.C.); it shows the instrument being played while hanging from the player's neck" (35). This instrument was traded and traveled to different parts of the Middle East. Each country customized and designed its own versions to adapt to their musical scales and tunings. The original santur was made with wood and stones and strung with goat intestines. The Mesopotamian santur has been claimed to be the father of the harp, the Chinese yangqin, the harpsichord, the qanun, the cimbalom, and the American and European hammered dulcimers. Name The name 'santur' c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tunable Laser
A tunable laser is a laser whose wavelength of operation can be altered in a controlled manner. While all laser gain media allow small shifts in output wavelength, only a few types of lasers allow continuous tuning over a significant wavelength range. There are many types and categories of tunable lasers. They exist in the gas, liquid, and solid state. Among the types of tunable lasers are excimer lasers, gas lasers (such as CO2 and He-Ne lasers), dye lasers (liquid and solid state), transition metal solid-state lasers, semiconductor crystal and diode lasers, and free electron lasers. Tunable lasers find applications in spectroscopy, photochemistry, atomic vapor laser isotope separation, and optical communications. Types of tunability Single line tuning Since no real laser is truly monochromatic, all lasers can emit light over some range of frequencies, known as the linewidth of the laser transition. In most lasers, this linewidth is quite narrow (for example, the nm wave ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wavelength-division Multiplexing
In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e., colors) of laser light. This technique enables bidirectional communications over a single strand of fiber, also called wavelength-division duplexing, as well as multiplication of capacity. The term WDM is commonly applied to an optical carrier, which is typically described by its wavelength, whereas frequency-division multiplexing typically applies to a radio carrier which is more often described by frequency. This is purely conventional because wavelength and frequency communicate the same information. Specifically, frequency (in Hertz, which is cycles per second) multiplied by wavelength (the physical length of one cycle) equals the velocity of the carrier wave. In a vacuum, this is the speed of light, usually denoted by the lowercase letter, c. In glass fiber, it is subst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Distributed Feedback Laser
A distributed-feedback laser (DFB) is a type of laser diode, quantum-cascade laser or optical-fiber laser where the active region of the device contains a periodically structured element or diffraction grating. The structure builds a one-dimensional interference grating (Bragg scattering), and the grating provides optical feedback for the laser. This longitudinal diffraction grating has periodic changes in refractive index that cause reflection back into the cavity. The periodic change can be either in the real part of the refractive index or in the imaginary part (gain or absorption). The strongest grating operates in the first order, where the periodicity is one-half wave, and the light is reflected backwards. DFB lasers tend to be much more stable than Fabry–Perot or DBR lasers and are used frequently when clean single-mode operation is needed, especially in high-speed fiber-optic telecommunications. Semiconductor DFB lasers in the lowest loss window of optical fibers at abo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wavelength-division Multiplexing
In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e., colors) of laser light. This technique enables bidirectional communications over a single strand of fiber, also called wavelength-division duplexing, as well as multiplication of capacity. The term WDM is commonly applied to an optical carrier, which is typically described by its wavelength, whereas frequency-division multiplexing typically applies to a radio carrier which is more often described by frequency. This is purely conventional because wavelength and frequency communicate the same information. Specifically, frequency (in Hertz, which is cycles per second) multiplied by wavelength (the physical length of one cycle) equals the velocity of the carrier wave. In a vacuum, this is the speed of light, usually denoted by the lowercase letter, c. In glass fiber, it is subst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iolon
Iolon Inc. was a manufacturer and designer of tunable lasers and optical devices. Its headquarters were in San Jose, California. Its products included the Apollo line of lasers, as well as optical switches, polarization controllers, tunable filters, spectral monitors, and universal transponders. Iolon raised over US$85 million in capital during the dot-com bubble of 1995–2001, but faltered as the telecommunications market tightened after the bubble burst. Iolon's remaining assets were bought by Coherent in 2005, for $5 million. In 2006, Luna Technologies acquired the rights to sell a version of the Apollo laser for use in fiber optic An optical fiber, or optical fibre in Commonwealth English, is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair. Optical fibers are used most often as a means t ... test and measurement instrumentation, and sensing applications. They are selling the modified Apol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nortel
Nortel Networks Corporation (Nortel), formerly Northern Telecom Limited, was a Canadian multinational telecommunications and data networking equipment manufacturer headquartered in Ottawa, Ontario, Canada. It was founded in Montreal, Quebec, in 1895 as the Northern Electric and Manufacturing Company. Until an antitrust settlement in 1949, Northern Electric was owned principally by Bell Canada and the Western Electric Company of the Bell System, producing large volumes of telecommunication equipment based on licensed Western Electric designs. At its height, Nortel accounted for more than a third of the total valuation of all companies listed on the Toronto Stock Exchange (TSX), employing 94,500 people worldwide. In 2009, Nortel filed for bankruptcy protection in Canada and the United States, triggering a 79% decline of its corporate stock price. The bankruptcy case was the largest in Canadian history and left pensioners, shareholders and former employees with enormous losses. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thermoelectric Cooling
Thermoelectric cooling uses the Peltier effect to create a heat flux at the junction of two different types of materials. A Peltier cooler, heater, or thermoelectric heat pump is a solid-state active heat pump which transfers heat from one side of the device to the other, with consumption of electrical energy, depending on the direction of the current. Such an instrument is also called a Peltier device, Peltier heat pump, solid state refrigerator, or thermoelectric cooler (TEC) and occasionally a thermoelectric battery. It can be used either for heating or for cooling, although in practice the main application is cooling. It can also be used as a temperature controller that either heats or cools. This technology is far less commonly applied to refrigeration than vapor-compression refrigeration is. The primary advantages of a Peltier cooler compared to a vapor-compression refrigerator are its lack of moving parts or circulating liquid, very long life, invulnerability to leaks, smal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
JDSU
JDS Uniphase Corporation (JDSU) was an American company that designed and manufactured products for optical communications networks, communications test and measurement equipment, lasers, optical solutions for authentication and decorative applications, and other custom optics. It was headquartered in Milpitas, California. In August 2015, JDSU split into two different companies – Viavi Solutions and Lumentum Holdings. History Uniphase was started in 1979 in a San Jose, California garage, and made lasers for chip makers and scanners. In 1981, JDS Optics was founded in Canada by Philip Garel-Jones, Gary Duck, Jozef Straus, and Bill Sinclair. The "JDS" is short for Jones, Duck and Straus/Sinclair. The company became JDS Fitel when it formed a partnership with Fitel, a fiber optic and optical connector company. In 1999, JDSU was formed by the merger between JDS Fitel and Uniphase, and it became known as JDS Uniphase subsequent to the merger. Three other major fiber companies were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oclaro
Oclaro was a United States, US-based business manufacturing and selling optical, optical components. Oclaro was formerly listed on the London Stock Exchange and was a constituent of the FTSE 100 Index. The company is now part of Lumentum (LITE) after being acquired in December 2018. History The Company was founded in the United Kingdom in 1988 as ''Bookham Technology''. It became the first company to make optical, optical components that can be integrated into a silicon integrated circuit. In 2002 the Company expanded substantially when it acquired the optical components businesses of Marconi Company, Marconi and Nortel Networks. In 2003 it acquired Cierra Photonics of Santa Rosa, California, and New Focus, a United States, US business, for £118 million. In 2004 it acquired Onetta, Inc. and became a United States, US-Domicile (law), domiciled company. In March 2006, Bookham acquired Avalon Photonics based in Zurich, Switzerland Avanex Corporation was incorporated in 1997 and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Internet
The Internet (or internet) is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices. It is a '' network of networks'' that consists of private, public, academic, business, and government networks of local to global scope, linked by a broad array of electronic, wireless, and optical networking technologies. The Internet carries a vast range of information resources and services, such as the inter-linked hypertext documents and applications of the World Wide Web (WWW), electronic mail, telephony, and file sharing. The origins of the Internet date back to the development of packet switching and research commissioned by the United States Department of Defense in the 1960s to enable time-sharing of computers. The primary precursor network, the ARPANET, initially served as a backbone for interconnection of regional academic and military networks in the 1970s to enable resource shari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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