Fiber Optic Wiki

Optical burst switching(1)

September 22, 2011

Optical burst switching (OBS) is a telecommunication technique that allows dynamic sub-wavelength switching of data. Optical Burst Switching is viewed as a compromise between the yet unfeasible full optical packet switching (OPS) and the mostly static optical circuit switching (OCS).

Optical burst switching(2)

September 22, 2011

The purpose of optical burst switching (OBS) is to dynamically provision sub-wavelength granularity by optimally combining electronics and optics. OBS considers sets of packets with similar properties called bursts. Therefore, OBS granularity is finer than optical circuit switching (OCS). OBS provides more bandwidth flexibility than wavelength routing but requires faster switching and control technology. OBS can be used for realizing dynamic end-to-end all optical communications.

Alternate-Phase Return-to-Zero

September 22, 2011

Alternate-Phase Return-to-Zero (APRZ) is an optical signal format.

Utah Telecommunication Open Infrastructure Agency(1)

September 22, 2011

The Utah Telecommunication Open Infrastructure Agency (UTOPIA) is a consortium of 16 Utah cities engaged in deploying and operating a fiber to the premises network to every business and household (about 140,000) within its footprint. Using an active Ethernet infrastructure and operating at the wholesale level, it supports open access and promotes competition in all telecommunications services.

Utah Telecommunication Open Infrastructure Agency(2)

September 22, 2011

UTOPIA bonds for construction costs using sales tax pledges as collateral to secure the bond. Revenues to cover the bonds are then set aside by pledging cities in an interest-bearing account and will only be used should subscriber revenues fail to cover the debt service. Because UTOPIA cities all bond at the same time and use their collective bond ratings and taxing authority, financing is generally seen as low-risk and secures a low interest rate.

DPSK decoding

September 21, 2011

The DPSK decoding method is achieved by comparing the phase of two sequential bits. An incoming DPSK optical signal is first split into two beams with equal intensities, in which one beam is delayed in space by an optical path difference that introduces a time delay corresponding to one bit. The two beams in the two paths are then coherently recombined to interfere each other constructively or destructively. The interference intensity is measured and becomes the intensity-keyed signal. A typical optical system for such a purpose is Mach-Zehnder interferometer or Michelson interferometer, forming an optical DPSK Demodulator.

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