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SIGMA

ANALOG & DIGITAL FIBER OPTIC LINK

MODEL FOT100N Mfd.by: -

SIGMA TRAINERSE-103, J! A"b# N$%,

N#% d$" S'())*, T(*+#,

AMEDABAD - 300/.

P()# : 21-4-56/554 756/05

F8 : 21-4-56050

E"!* : 9*#99!$"+%!#%9. ')"

: 9!$"+%!#%99!fy .')"

;#b :

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CAPTERS

1. To study Circuit detail of Analog & Digital fiber optic link.

E=PERIMENTS1. To transmit and receive analog signal using fiber optic cable.

2. To transmit and receive digital signal using fiber optic cable.

3

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INTRODCTION

This trainer has been designed ith a vie to provide practical and e!p erimental knoledge of a general

circuit of analog and digital fiber optic link o n a "#$%' (.C.).

SPECIFICATIONS

1. (oer supply re*uirement + 23,- AC /, 0.

2. )uilt in #C based poer supply.

3. Transmitter+ 2 $o. iber optic 'Ds 4(eak 5avelength of emission 66,mm7

8. 9eceiver+ 2 $o. iber opt ic (hoto Detectors

/ . unct ion %enera to r+

a.1 :h "ine 5ave 4Amplitude ad;ustable7

b. 1 :h "* uare 5a ve 4T T7

6. All parts are soldered on single pin TA%" on single (C) of sie 12< ! =< ith complete circuit diagram

screen printed.

>. "tandard Accessories + 1. A Training ?anual.

2. Connecting (atch cords.

3. iber @ptic Cable 1 meter.

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CAPTER-1

CIRCIT DETAILS ANALOG & DIGITAL FIBER OPTIC LINK

The Analog & Digital fiber optic link consists of folloing sections.

1 . Analog s ignal t ransmit ter

2 . Digital Data transmi tter 3 . Analog s ignal receiver

8 . Digital Data receiver

/ . unct ion %enera to r

6 . ( o er su pp ly.

>1? A*)$ T%9"!++#% 9#'+!) :-

0ere #C >80C,8 and #c 8,8, and T,>8 together used to generate sineave signal. 0ere crystal and #C>80C,8 is used to generate clock fre*uency. Than #c8,8, that is asynchronous )inary 12 bit counter is used to

generate 1:h Clock signal. And this clock signal is given as input o f filter that is made by using #c T,>8. This#C contains for operational amplifier.4#C >817.

$o th e 1kh sin e av e is gi ve n to th e Am pl if ier ck t an d ou tp ut of th is ampli fi er is given to th e ba se of

transistor 2$2222. At the collector of this fiber 'D of B2,nm is connected that coverts the electrical si gnal intothe light signal and this light signal is transmitted through the fiber optic cable.

>5? D!$!+* T%9"!++#% 9#'+!) :-

The output from #C 8,8, that is 1kh TT clock pulse is given to the digital input of the digital transmittersection. And again also at the emitter of the transistor )C/8B fiber led is connected n o the electrical signal is

converted into the light signal using 6/,nm fiber led.

>3?. A*)$ 9!$* %#'#!@#% 9#'+!):-

The received light signal is converted into electrical signal by receiving (hoto diode. Then it is given to to #C

3/3 and 3/1 hich are used to amplify input analog si gnal. The amplified signal is available at output terminal.

>?. D!$!+* 9!$* %#'#!@#% 9#'+!):-

The received light signal is converted into electrical signal by receiving (hoto diode. Then it is given to #C >81

And #C 311 hich are used to amplify input analog signal. The amplified signal is available at output terminal.

>/? P)

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TEST POINT ;AEFORMS

;1. A*)$ !7:-

,./-

,./-

1m s

;5. >+ R#')@#%#d O7P +#%"!*?:-

;3: D!$!+* !+:-

;. D!$!+* )++ + R#')@#%#d O++ +#%"!*:-

6

0 E 1 ms

- E 1., -

Trig E C9@1

0 E 1msdiv

- E 1.,-div

Trig E C9@2

0E1msdiv

-E2volts

0E1msdiv

-E2voltsdiv

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