Fiber Optic Wiki

Implementation of optical hybrids

September 30, 2011

For laboratory purposes, the 90° optical hybrid has traditionally been constructed using two 50/50-beam splitters and two beam combiners, plus one 90° phase shifter (See Figure 2). These optical hybrids can be implemented using all-fiber, planar waveguide technologies or free-space technology.

Optical performance monitoring

September 30, 2011

Optical performance monitoring (OPM) is used for managing high capacity dense wavelength division multiplexing (DWDM) optical transmission and switching systems in Next Generation Networks (NGN). OPM involves assessing the quality of data channel by measuring its optical characteristics without directly looking at the transmitted sequence of bits. It is a potential mechanism to improve control of transmission and physical layer fault management in optical transmission systems.

Novus Entertainment

September 30, 2011

Founded in 1996, the company provides high-speed internet, digital and cable television and telephone service, mostly in Vancouver's Yaletown, Coal Harbour and downtown neighbourhoods.

Dynamic circuit network

September 30, 2011

A dynamic circuit network (DCN) is an advanced computer networking technology that combines traditional packet-switching communication based on the Internet Protocol, as used in the Internet, with circuit-switching methodologies that are characteristic of traditional telephone network systems. This combination allows user-initiated ad-hoc dedicated allocation of network bandwidth for high-demand, real-time applications and network services, delivered over an optical fiber infrastructure.

Optical interleaver

September 30, 2011

An optical interleaver is a 3-port passive fiber-optic device that is used to combine two sets of dense wavelength-division multiplexing (DWDM) channels (odd and even channels) into a composite signal stream in an interleaving way. For example, optical interleaver takes two multiplexed signals with 100 GHz spacing and interleaves them, creating a denser DWDM signal with channels spaced 50 GHz apart. The process can be repeated, creating even denser composite signals with 25 GHz or 12.5 GHz spacing.

How time-stretch analog-to-digital converter works

September 28, 2011

A time-stretch analog-to-digital converter (with a stretch factor of 4) is shown. The original analog signal is time-stretched and segmented with the help of a time-stretch preprocessor (generally on optical frontend). Slowed down segments are captured by conventional electronic ADCs. The digitized samples are rearranged to obtain the digital representation of the original signal.

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