Fiber Optic Wiki

DPSK Demodulator / Delay Line Interferometer

September 21, 2011

Optical differential-phase shift keying (DPSK) provides a desired modulation format that offers high receiver sensitivity, high tolerance to major nonlinear effects in high-speed transmissions, and high tolerance to coherent crosstalk. In DPSK, data information is carried by the optical phase difference between adjacent bits. For direct detection of DPSK signal (by conventional intensity detectors), a DPSK demodulator is needed to convert the phase-coded signal into an intensity-coded signal.

Delay Line Interferometer

September 21, 2011

Tunable DPSK demodulator: A tunable DPSK demodulator is the DPSK demodulator whose spectral response can be tuned along the frequency axis while keeping the FSR unchanged.

FTTLA

September 21, 2011

FTTLA is the acronym of the English term Fiber To The Last Amplifier. The network cables being able to use several amplifiers, the FTTLA aims at replacing the coaxial cable to the last amplifier (towards the subscriber) by optical fibre. It acts as a new technology aiming at re-using the network cables existing in particular on the final part while installing of optical fibre more closer to the subscriber while using the coaxial cable of the networks cables for the "last mile" or "last meters" connected with the subscriber.

Offset time

September 21, 2011

In optical burst switching, offset time is the time between the burst header/control packet.

Synchronous Optical Networking

September 20, 2011

Synchronous Optical Networking (SONET) or Synchronous Digital Hierarchy (SDH) are standardized multiplexing protocols that transfer multiple digital bit streams over optical fiber using lasers or light-emitting diodes (LEDs). Lower rates can also be transferred via an electrical interface.

Encyclopedia:Difference from PDH

September 20, 2011

Synchronous networking differs from Plesiochronous Digital Hierarchy (PDH) in that the exact rates that are used to transport the data are tightly synchronized across the entire network, using atomic clocks.

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