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PRESENTED BY:-

RAVI PRAKASH MISHRA

EC-2 B1 (0709131081)

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Advanced Communication Technology.Advanced Communication Technology.

It transmit data in form of laser for free space optics andIt transmit data in form of laser for free space optics and

infra red light for opticalinfra red light for optical fibrefibre communication.communication.It is also known as free space optics.It is also known as free space optics.

TeraTera Hz optical network works on the same basic principleHz optical network works on the same basic principle

as infrared remote controls ,wireless keyboard oras infrared remote controls ,wireless keyboard or wirwlesswirwless

palm device.palm device.

It has very short distance optical network.It has very short distance optical network.

Introduced by Alexander Graham BellIntroduced by Alexander Graham Bell

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Optical modulator works by modulating electrical signal

with laser of predefined wavelength.

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Unlike radio and microwave systems, THz Optical Network isan optical technology and no spectrum licensing or frequencycoordination with other users is required.

point-to-point laser signal is extremely difficult to intercept,and therefore secure.

THz Optical Network systems with very low error rates can beimplemented.

extremely narrow laser beam widths ensure that there isalmost no practical limit to the number of separate THzOptical Network links that can be installed in a givenlocation.

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It does not need any licence

of bandwidth limitation.

It is possible to mount THzOptical Network systems

inside buildings, reducing

the need to compete for

roof space.

The only essential

requirement for THz Optical Network

transmission is line of sight between the two ends of the link.

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The increasing demand for high bandwidth in metro

networks is relentless and service providers pursuit of a

range of applications.Enterprise LAN-to-LAN connectivity.

Because the current RF bandwidth ceiling is 622

megabits so it cannot scale to optical capacities of 2.5

gigabits.As bandwidth demands increase and businesses turn to

high-speed LANs.

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Optical wireless systems offer many features, principalamong them being low start-up and operational costs,rapid deployment, and high fiber-like bandwidths.

Currently THz uses two wavelength systems that operatenear 800 nm and those that operate near 1550 nm.

There are compelling reasons for selecting 1550 nm THzOptical Network systems due to laser eye safety, reduced

solar background radiation, and compatibility withexisting technology infrastructure.

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Laser beams with wavelengths in the range of 400 to 1400nm emit light that passes through the cornea and lens andis focused onto a tiny spot on the retina .

While wavelengths above 1400 nm are absorbed by thecornea and lens, and do not focus onto the retina.

It is possible to design eye-safe laser transmitters at boththe 800 nm and 1550 nm wavelengths but the allowable

safe laser power is about fifty times higher at 1550 nm.it provides up to 17 dB additional margin, allowing the

system to propagate over longer distances, through heavierattenuation, and to support higher data rates.

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THz Optical Network systems offer a flexible

networking solution that delivers on the promise of

broadband virtually unlimited bandwidth.Freedom from licensing and regulation translates into

ease, speed and low cost of deployment.

Since THz Optical Network optical wireless

transceivers can transmit and receive through

windows, it is possible to mount THz Optical

Network systems inside buildings.

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Fog substantially attenuates visible radiation and it has asimilar affect on the near-infrared wavelengths that areemployed in THz Optical Network systems.

THz Optical Network optical wireless radiation is entirelyanalogous to the attenuation and fades suffered by RFwireless systems due to rainfall.

THz Optical Network products which have widely spaced

redundant transmitters and large receive optics willeliminate interference concerns from objects such as birds.

Any small obstacle does not have any impact on THznetwork.

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Laser beams cannot be detected with spectrumanalyzers or RF meters.

Laser transmissions travel along a line of sight path

that cannot be intercepted easily.It requires a matching transceiver carefully aligned

to complete the transmission. Interception is verydifficult and extremely unlikely.

The laser beams are narrow and invisible, makingthem harder to find and even harder to intercept andcrack .

Data can be transmitted over an encryptedconnection adding to the degree of security .

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In clear weather the transmit power is greatly reduced,

enhancing the laser lifetime by operating the laser at very

low-stress conditions.In severe weather, the laser power is increased as needed

to maintain the optical link - then decreased again as the

weather clears.

A TEC controller that maintains the temperature of thelaser transmitter diodes in the optimum region will

maximize reliability and lifetime.

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THz Optical Network provides a low cost, rapidly

deployable method of gaining access to the fiber optic

backbone.As a truly protocol-independent broadband conduit, THz

Optical Network systems complement legacy network

investments and work in harmony with any protocol.

THz Optical Network eliminates the need to obtain costlyspectrum licenses or meet further regulatory requirements.

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