GROUP STUDY – FIBER OPTICS GROUP STUDY – FIBER OPTICS
1.
1. What iWhat is the s the freqfrequency uency of aof an LED n LED at 1.at 1.9eV?9eV? a
a.. 44559 9 GGHHzz bb. . 66445 5 GGHHzz c. c. ! ! ""HHzz ##. . 44559 9 ""HHzz $.
$. %n absor&%n absor&tion 'ostion 'oss cause# by (a's cause# by (a'ence e'eence e'ectroctrons in the si'ica )ans in the si'ica )ateriateria' fro)' fro) *hich the +bers are )anufacture#.
*hich the +bers are )anufacture#. a
a.. ,,oo##aa' ' ##iiss&&eerrssiioonn bb. . --nnffrraarree## cc. . ''ttrraa((iioo''eett ##. . --oonn /esonance
/esonance .
. "he *a("he *a(e'en0e'en0th of 'i0th of 'i0hts are (ehts are (ery short anry short an# can be )ea# can be )easure# isure# in ter)s of n ter)s of a
a.. ,,ii''''ii))eetteer r bb. . aann00ssttrroo)) cc. . ))eetteerr ##.. centi)eter
centi)eter 4.
4. What What is tis the rhe refracefracti(e ti(e in#ein#e of of air?air? a
a.. 22..1144 bb.. 22..$$55 cc.. 11 ##.. $$ 5.
5. "he LED r"he LED requirequires 3333es 33333 bia3 bias in or#s in or#er to i'er to i''u)ina'u)inatete a
a. /. /ee((eerrssee bb. . zzeerroo c. c. ffoorr**aarr## ##. . ++ee## 6.
6. a'ca'cu'ate the critu'ate the critica' an0ica' an0'e of inci#e'e of inci#ence bet*nce bet*een $ substanceeen $ substances *ith #iers *ith #ierentent refracti(e in#ices *here n1 1.5 an# n$ 1.46.
refracti(e in#ices *here n1 1.5 an# n$ 1.46. a
a.. !!44..9 9 ##ee00rreeeess bb. . !!55..6 6 ##ee00rreeeess cc. . !!99..9 9 ##ee00rreeeess ##.. !6.! #e0rees
!6.! #e0rees !.
!. -t is a ty&e of +ber o&t-t is a ty&e of +ber o&tic cab'ic cab'e *here *herein an in#e cein an in#e chan0es frhan0es fro) the coro) the core to thee to the c'a##in0.
c'a##in0. a
a.. 77ttee& & iinn##ee bb. . ssiinn00''e e ))oo##ee cc. . 00rraa##ee# # iinn##ee #. )u'ti)o#e
#. )u'ti)o#e 8.
8. "hat #ie"hat #ie'ectri'ectric )ateric )ateria' of an o&tica' of an o&tica' +ber surra' +ber surroun#ioun#in0 the coren0 the core.. a
a.. 77hhiiee''## bb. . oo((eerr cc. . %%rr))oorr #. #. ''aa####iinn00 9.
9. Which of thWhich of the fo''oe fo''o*in0 is no*in0 is not an a#(antt an a#(anta0e of a +ba0e of a +ber o&tier o&tic cab'c cab'e?e? a
a.. aann##**ii##tthh bb. . **eeii00hhtt cc. . ))oobbii''iittyy ##. . ccrroossssttaa'':: 12./eferre# to as a 'i0ht source of +ber o&tic cab'e *hich su&&'ies a &o*er 'e(e' 12./eferre# to as a 'i0ht source of +ber o&tic cab'e *hich su&&'ies a &o*er 'e(e'
of 5 to ! )*
of 5 to ! )* an# ha(in0 a narro* s&ectru) of e)ission.an# ha(in0 a narro* s&ectru) of e)ission. a
a.. ;;hhoottoo##iioo##ee bb. . rryyssttaa' ' ##iioo##ee cc. . --LLDD ##. . LELEDD 11.What #o you ca'' the 'oss in si0na' &o*er as the 'i0ht tra(e's #o*n the +ber? 11.What #o you ca'' the 'oss in si0na' &o*er as the 'i0ht tra(e's #o*n the +ber?
a
a.. eenn##iinn00 bb. . ssccaatttteerriinn00 cc. . aatttteennuuaattiioonn ##.. &ro&a0ation
&ro&a0ation 1$.Which of
1$.Which of the fo''o*in0 #escribes the 'i0ht 0atherin0 ca&abi'ities of a +ber?the fo''o*in0 #escribes the 'i0ht 0atherin0 ca&abi'ities of a +ber? a
a.. DDiiss&&eerrssiioonn bb. . ##iirraaccttiioon n iinn##ee cc. . rreeffrraaccttii((e e iinn##ee ##. . nnuu))eerriiccaa'' a&erture
a&erture 1.% ty&e of
1.% ty&e of +ber 'oss #ue to the +ber 'oss #ue to the s)a'' surface irre0u'arities in the c'a##in0s)a'' surface irre0u'arities in the c'a##in0 *hich causes the 'i0ht to be
*hich causes the 'i0ht to be re<ecte# at an0'es *here there is no furtherre<ecte# at an0'es *here there is no further re<ections.
re<ections. a
a.. ,,iiccrroobbeenn## bb. . ))aaccrroobbeenn## cc. . ssccaatttteerriinn00 ##.. absor&tion
absor&tion
14.a'cu'ate the ener0y of the
14.a'cu'ate the ener0y of the &hoton of infrare# 'i0ht ener0y at 1.55 u).&hoton of infrare# 'i0ht ener0y at 1.55 u). a
a.. 11..9 9 1122ee&&==114 4 >>bb. . 11..$$$ $ 1122ee&&==116 6 >> cc. . 11..$$8 8 1122ee&&==119 9 >> ##. . 11..66 12 e&=19 >
12 e&=19 >
15."he )ost co))on #e(ice use# as a 'i0ht #etector in +ber o&tic 15."he )ost co))on #e(ice use# as a 'i0ht #etector in +ber o&tic
co))unication syste). co))unication syste). a
a.. LLEEDD bb. . ##aarr''iinn00ttoon n &&hhoottoottrraannssiissttoorr cc. . %%;;DD ##. . ;;-- #io#e
16.% 'a* that states the re'ationshi& bet*een inci#ent an# refracte# rays.
a. "yn#a'' eect b. 7ne''@s La* c. Do&&'er@s La* #. Ae&'er@s La*
1!.Which of the fo''o*in0 is not consi#ere# as one of the causes for the 'oss of si0na' &o*er as 'i0ht tra(e's throu0h the o&tic +ber?
a. -nter)o#u'ation b. 7catterin0 c. %bsor&tion #. Biber en#in0
18.Cne of the fo''o*in0 is not a)on0 the ty&e of +ber o&tic cab'es use# in e'ectronic co))unications.
a. 7in0'e )o#e b. ste& in#e c. se)i 0ra#e# #. 0ra#e# in#e
19."he ratio of the s&ee# of 'i0ht in a (acuu) to the s&ee# of 'i0ht in a )ateria'. a. ;er)itti(ity b. #ie'ectric constant c. refracti(e in#e #.
(e'ocity factor
$2."he Euro&ean stan#ar# for hi0h #ata rate trans)ission of si0na's in +ber o&tic co))unications.
a. 7CE" b. ;DH c. 7"7=1 #.
7DH
$1.Which of the fo''o*in0 is not use# as one of the techno'o0ies for +ber o&tics L%?
a. BDD- b. Ethernet c. 7CE" #. Gi0E $$."his ta:es &'ace *hen 'i0ht stri:es a surface an# is con(erte# into heat
throu0h an echan0e of ener0y *ith the ato)s of the surface.
a. Diraction b. absor&tion c. scatterin0 #. #is&ersion
$."y&e of +ber that has the hi0hest )o#a' #is&ersion.
a. Gra#e# in#e )o#e c. 0ra#e# in#e )u'ti)o#e b. 7te& in#e )u'ti)o#e #. ste& in#e sin0'e )o#e
$4.;ro&ose# the use of c'a# 0'ass +ber as a #ie'ectric *a(e0ui#e. a. Aar&on an# oc:ha) c. oc:ha) an# Aao b. Aao an# Aec: #. Aar&on an# Aec:
$5.-t is )a#e fro) se)icon#uctor )ateria' such as %'u)ini)=0a''iu)=arseni#e or 0a''iu)=arseni#e=&hos&hi#e.
a. %;D b. LED c. -LD #. ;- #io#e $6.BDD- stan#s for
a. Biber Di0ita' Data -nterface c. Biber Distribution De'ay -nterface b. Biber Distribute# Data -nterface #. Brequency=Di(ision Data -nterface $!. 7CE" stan#s for
a. 7i)&'e C&tica' et*or: c. 7ynchronous C&tica' et*or: b. 7tan#ar# C&tica' et*or: #. none of the abo(e
$8.DWD, stan#s for
a. Di0ita' Wa(e'en0th=Di(ision ,o#u'ation b. Dense Wa(e'en0th=Di(ision ,o#u'ation c. Doub'e Wa(e'en0th=Di(ision ,o#u'ation #. Dense Wa(e'en0th=Di(ision ,u'ti&'ein0 $9. % 7o'iton is a
a. #efect in the 0'ass c. ty&e of &u'se b. ty&e of &artic'e #. ty&e of o&tica' net*or:
2.C"D/ stan#s for
a. C&tica' "i)e=De'ay /es&onse c. C&tica' "i)e=Do)ain /e<ecto)eter b. C&tica' "i)in0 De'ay /equire)ent #. C&tica' "i)e=Di(ision /e'ay
1. 7DH stan#s for 33333333333333333333.
a. 7y))etric Data Hierarchy c. 7y))etric Di0ita' Hierarchy b. 7ynchronous Di0ita' Hierarchy #. 7ynchronous Data Hierarchy $.%n inci#ent ray can be #e+ne# as
a. % 'i0ht ray re<ecte# fro) a <at surface c. % #iuse# 'i0ht ray
b. % 'i0ht ray #irecte# to*ar# a surface #. % 'i0ht ray that ha&&ens &erio#ica''y ."he ter) #is&ersion #escribes the &rocess of
a. se&aratin0 'i0ht into its co)&onent frequencies b. re<ectin0 'i0ht fro) a s)ooth surface
c. the &rocess by *hich 'i0ht is absorbe# by an une(en rou0h surface #. 'i0ht scatterin0
4.Which of the fo''o*in0 ter)s #escribes the reason that 'i0ht is refracte# at #ierent an0'es?
a. ;hoton ener0y chan0es *ith *a(e'en0th
b. Li0ht is refracte# as a function of surface s)oothness c. "he an0'e is #eter)ine# &art'y by a an# b
#. "he an0'e is #eter)ine# by the in#e of the )ateria's 5."he ter) critica' an0'e #escribes
a. the &oint at *hich 'i0ht is refracte#
b. the &oint at *hich 'i0ht beco)es in(isib'e
c. the &oint at *hich 'i0ht has 0one fro) the refracti(e )o#e to the re<ecti(e )o#e
#. the &oint at *hich 'i0ht has crosse# the boun#ary 'ayers fro) one in#e to another
6."he c'a##in0 *hich surroun#s the +ber core a. is use# to re#uce o&tica' interference
b. is use# to &rotect the +ber
c. acts to he'& 0ui#e the 'i0ht in the core
#. ensures that the refracti(e in#e re)ains constant
!."he ter)s sin0'e )o#e an# )u'ti)o#e are best #escribe# as a. "he nu)ber of +bers &'ace# into a +ber=o&tic cab'e
b. "he nu)ber of (oice channe's each +ber can su&&ort c. "he nu)ber of *a(e'en0ths each +ber can su&&ort #. "he in#e nu)ber
8."he hi0her the in#e nu)ber a. "he hi0her the s&ee# of 'i0ht b. "he 'o*er the s&ee# of 'i0ht
c. Has no eect on the s&ee# of 'i0ht
#. "he shorter the *a(e'en0th &ro&a0ation
9."he three )aor 0rou&s in the o&tica' syste) are a. "he co)&onentsF the #ata rate an# res&onse ti)e b. "he sourceF the 'in:F an# the recei(er
c. "he trans)itterF the cab'eF an# the recei(er #. "he sourceF the 'in:F an# the #etector
42."he abru&t chan0e in refracti(e in#e fro) core to c'a##in0 of +ber=o&tic cab'e is ca''e# the
a. "ota' interna' re<ection b. u)erica' a&erture c. Dis&ersion #. 7te& in#e
41.% technique that is use# to )ini)ize the &u'se #is&ersion eect is to
a. se a hi0her frequency 'i0ht source c. ,ini)ize the core #ia)eter b. se &'astic c'a##in0 #. %'' the abo(e
4$.Which is not an i)&ortant characteristic of a 'i0ht #etector?
a. /es&onsiti(ity b. Dar: current c. ;o*er consu)&tion #. /es&onse s&ee#
4."he #is&ersion of 'i0ht in +ber=o&tic cab'e cause# by a &ortion of the 'i0ht ener0y tra(e'in0 in the c'a##in0 is ca''e#
a. ,o#a' #is&ersion b. ,ateria' #is&ersion c. Wa(e0ui#e #is&ersion #. ab'e #is&ersion
44.Which of the fo''o*in0 consi#erations is i)&ortant *hen #eci#in0 bet*een usin0 a #io#e 'aser or an LED?
a. /es&onse ti)e b. ;o*er 'e(e's c. "e)&erature sensiti(ity #. Bai'ure characteristics
45.-t is the centra' &art of the o&tica' co))unication syste)
a. Li0ht 7ource b. C&tica' Biber c. ;hoto#etector #. none of the abo(e
46."he 'i0ht ener0y that is a'*ays e)itte# or absorbe# in #iscrete units
a. Li0ht /ay b. oson c. uanta #. Li0ht 4!."he theory *hich states that *hen (isib'e 'i0ht or hi0h=frequency
e'ectro)a0netic ra#iation i''u)inates a )eta''ic surfaceF e'ectrons are e)itte#.
a. ;hotoe'ectric eect b. ;'anc:@s 'a* c. ;hotoe)ission eect #. /ay "heory of 'i0ht
48.% &heno)enon in o&tica' +ber co))unication syste) that is cause# by the #ierence in the &ro&a0ation ti)es of 'i0ht rays that ta:e #ierent &aths #o*n the +ber.
a. ;u'se s&rea#in0 b. Wa(e'en0th #istortion c. /ay'ei0h scatterin0 #. ,icroben#in0
49.Gi(en the ener0y 'e(e' of 6.6$412=18 > i)&arte# to an e'ectron strea) by an
=ray #e(iceF ca'cu'ate the frequency in ,Hz
a. 1212 ,Hz b. 1211 ,Hz c. 121$ ,Hz #. 129 ,Hz
52.Which of the fo''o*in0 is not a co))on a&&'ication of +ber=o&tic cab'e? a. 'ose# circuit "V b. onsu)er net*or: c. Lon0 = #istance te'e&hone syste)s #. onsu)er "V
51."ota' interna' re<ection ta:es &'ace if the 'i0ht ray stri:es the interface at an an0'e *ith *hat re'ationshi& to the critica' an0'e?
a. Less than b. Greater than c. Equa' to #. Iero 5$."he o&eration of a +ber=o&tic cab'e is base# on the &rinci&'e of a. /efraction b. /e<ection c. Dis&ersion #. %bsor&tion
5.Which of the fo''o*in0 is not a co))on ty&e of +ber=o&tic cab'e? a. 7in0'e = )o#e ste& = in#e b. ,u'ti)o#e 0ra#e# = in#e
c. 7in0'e = )o#e 0ra#e = in#e #. ,u'ti)o#e ste& = in#e 54.ab'e attenuation is usua''y e&resse# in ter)s of
a. Loss &er foot b. #J:) c. -ntensity &er )i'e #. Vo'ta0e #ro& &er inch
55.Which cab'e 'en0th has the hi0hest attenuation?
a. 1 :) b. $ :) c. 95 ft #. 522 ft
56."he u&&er &u'se rate an# infor)ation=carryin0 ca&acity of a cab'e is 'i)ite# by
a. ;u'se shortenin0 b. %ttenuation c. Li0ht 'ea:a0e #. ,o#a' #is&ersion
5!."he core of a +ber=o&tic cab'e is )a#e of
a. %ir b. G'ass c. Dia)on# #. uartz 58."he core of a +ber=o&tic cab'e is surroun#e# by
a. Wire brai# shie'# b. Ae('ar c. 'a##in0 #. ;'astic insu'ation 59."he s&ee# of 'i0ht in &'astic co)&are# to the s&ee# of 'i0ht in air is a. Less b. ,ore c. "he sa)e #. Iero
62.Which of the fo''o*in0 is not a )aor bene+t of +ber=o&tic cab'e? a. -))unity fro) interference b. Ece''ent #ata security c. o e'ectrica' safety &rob'e)s #. Lo*er cost
61."he )ain bene+t of 'i0ht=*a(e co))unications o(er )icro*a(es or any other co))unications )e#ia are
a. Lo*er cost b. etter security c. Wi#er ban#*i#th #. Bree#o) fro) interference
6$.Which of the fo''o*in0 is not &art of the o&tica' s&ectru)
a. -nfrare# b. 'tra(io'et c. Visib'e co'or #. = rays
6."he *a(e'en0th of (isib'e 'i0ht eten#s fro)
a. 2.8 to 1.6 K) b. 422 to !52 n) c. $22 to 622 n) #. !22 to 1$22 n) 64."he s&ee# of 'i0ht is
a. 182F222 )iJh b. 22F222 )iJh c. 22F222 )Js #. 22F222F222 )Js
65./efraction is the
a. en#in0 of 'i0ht *a(es b. /e<ection of 'i0ht *a(es c. Distortion of 'i0ht *a(es #. Diusion of 'i0ht *a(es
66."he ratio of the s&ee# of 'i0ht in air to the s&ee# of 'i0ht in another substance is ca''e# the
a. 7&ee# factor b. -n#e of re<ection c. -n#e of refraction #. 7&ee# 0ain
6!.Which ty&e of +ber=o&tic cab'e is the )ost *i#e'y use#? a. 7in0'e = )o#e ste& = in#e b. ,u'ti)o#e ste&=in#e
c. 7in0'e = )o#e 0ra#e# = in#e #. ,u'ti)o#e 0ra#e# = in#e 68.Which ty&e of +ber=o&tic cab'e is best for (ery hi0h s&ee# #ata? a. 7in0'e = )o#e ste& = in#e b. ,u'ti)o#e ste&=in#e
c. 7in0'e = )o#e 0ra#e# = in#e #. ,u'ti)o#e 0ra#e# = in#e 69.Which ty&e of +ber=o&tic cab'e has the 'east )o#a' #is&ersion? a. 7in0'e = )o#e ste& = in#e b. ,u'ti)o#e ste&=in#e
c. 7in0'e = )o#e 0ra#e# = in#e #. ,u'ti)o#e 0ra#e# in#e !2.Which of the fo''o*in0 is not a factor in cab'e 'i0ht 'oss?
a. /e<ection b. %bsor&tion c. 7catterin0 #. Dis&ersion !1.% #istance of 8 :) is the sa)e as
a. $.5 )i b. 5 )i c. 8 )i #. 1$.9 )i
!$.% +ber=o&tic cab'e has a 'oss of 15 #bJ:). "he attenuation in a cab'e 1222ft 'on0 is
a. 4.5! # b. 9. # c. $4 # #. 49.$ #
!.Biber=o&tic *ith attenuations of 1.8F .4F 5.9 an# 18 # are 'in:e# to0ether. "he tota' 'oss is
a. !.5 # b. 19.8 # c. $9.1 # #. 652 #
!4.Which 'i0ht e)itter is &referre# for hi0h=s&ee# #ata in a +ber=o&tic syste)? a. -ncan#escent b. LED c. eon #. Laser
!5.,ost +ber=o&tic 'i0ht sources e)it 'i0ht in *hich s&ectru)? a. Visib'e b. -nfrare# c. 'tra(io'et #. = ray !6.oth LEDs an# -LDs o&erate correct'y *ith
a. Bor*ar# bias b. /e(erse bias c. either a or b #. Either a or b !!.7in0'e=frequency 'i0ht is ca''e#
a. ;ure b. -ntense c. oherent #. ,onochro)atic !8.Laser 'i0ht is (ery bri0ht because it is
a. ;ure b. White c. oherent #. ,onochro)atic !9.Which of the fo''o*in0 is not a co))on #etector?
a. ;- #io#e b. ;hoto(o'taic #io#e c. ;hoto#io#e #. %(a'anche &hoto#io#e
82.Which of the fo''o*in0 is the fastest 'i0ht sensor?
a. ;- #io#e b. ;hoto(o'taic #io#e c. ;hototransistor #. %(a'anche &hoto#io#e
81.;hoto#io#es o&erate &ro&er'y *ith
a. Bor*ar# bias b. /e(erse bias c. either a or b #. Either a or b 8$."he &ro#uct of the bit rate an# #istance of a +ber=o&tic syste) is $Gbits=
:)Js. What is the )ai)u) rate at 5 :)?
a. 122 ,bitsJs b. $22 ,bitsJs c. 422 ,bitsJs #. 1222 ,bitsJs
8.Which +ber=o&tic syste) is better?
a. re&eaters b. 8 re&eaters c. 11 re&eaters #. $2 re&eaters
84.% sin0'e +ber can han#'e as )any (oice channe' as
a. a &air of co&&er con#uctors b. a 1522=&air cab'e c. a 522=&air cab'e #. a 1222=&air cab'e 85.%n inci#ent ray can be #e+ne# as
a. a 'i0ht ray re<ecte# fro) a <at surface b. a 'i0ht ray #irecte# to*ar# a surface c. a #iuse# 'i0ht ray #. a 'i0ht ray that ha&&ens &erio#ica''y
86."he ter) dispersion #escribes the &rocess of a. se&aratin0 'i0ht into its co)&onent frequencies b. re<ectin0 'i0ht fro) a s)ooth surface
c. the &rocess by *hich 'i0ht is absorbe# by an une(en rou0h surface #. 'i0ht scatterin0
8!.Which of the fo''o*in0 ter)s #escribes the reason that 'i0ht is refracte# at #ierent an0'es?
a. ;hoton ener0y chan0es *ith *a(e'en0th
b. Li0ht is refracte# as a function of surface s)oothness
c. "he an0'e is #eter)ine# &art'y by a an# b
#. "he an0'e is #eter)ine# by the in#e of the )ateria's 88."he ter) critica' an0'e #escribes
a. the &oint at *hich 'i0ht is refracte#
b. the &oint at *hich 'i0ht beco)es in(isib'e
c. the &oint at *hich 'i0ht has 0one fro) the refracti(e )o#e to the re<ecti(e )o#e
#. the &oint at *hich 'i0ht has crosse# the boun#ary 'ayers fro) one in#e to another
89."he c'a##in0 *hich surroun#s the +ber core a. is use# to re#uce o&tica' interference
c. acts to he'& 0ui#e the 'i0ht in the core
#. ensures that the refracti(e in#e re)ains constant 92."he re<ecti(e in#e nu)ber is
a. a nu)ber *hich co)&ares the trans&arency of a )ateria' *ith that of air b. a nu)ber assi0ne# by the )anufacturer to the +ber in question
c. a nu)ber *hich #eter)ines the core #ia)eter #. a ter) for #escribin0 core e'asticity
91."he ter)s single mode an# multimode are best #escribes as a. the nu)ber of +bers &'ace# into a +ber=o&tic cab'e
b. the nu)ber of (oice channe's each +ber can su&&ort c. the nu)ber of *a(e'en0ths each +ber can su&&ort #. the in#e nu)ber
9$."he hi0her the in#e nu)ber a. the hi0her the s&ee# of 'i0ht b. the 'o*er the s&ee# of 'i0ht
c. has no eect on the s&ee# of 'i0ht
#. the shorter the *a(e'en0th &ro&a0ation
9."he three )aor 0rou&s in the o&tica' syste) are a. the co)&onentsF the #ata rate an# res&onse ti)e b. the sourceF the 'in:F an# the recei(er
c. the trans)itterF the cab'eF an# the recei(er #. the sourceF the 'in:F an# the #etector
94."he 'oss MattenuationN of si0na' in o&tica' +ber is #ue to
a. 7catterin0 b. %bsor&tion c. ,acroben#in0 #. %'' the abo(e
95.a'cu'ate the o&tica' &o*er 122 :) fro) a 2.5 )W source on a sin0'e )o#e +ber that has 2.12 # &er :) 'oss.
a. 52 nW b. 522 nW c. 5 KW #. 52 KW 96."he #is&ersion in +ber o&tics is ter)e#
a. ,o#a' b. hro)atic c. ;o'arization )o#e #. %'' the abo(e
9!.Biber o&tic connections suer hi0h 'oss #ue to
a. %ir 0a&s b. %ia' )isa'i0n)ent c. %n0u'ar )isa'i0n)ent #. %'' the abo(e
98.Biber o&tic techno'o0y is use# in a&&'ications of
a. Loca' area net*or:s ML%sN b. ab'e "V M%"VN syste)s c. "e'e&hone net*or:s #. %'' the abo(e
99."he #is&ersion of 'i0ht in +ber=o&tic cab'e cause# by a &ortion of the 'i0ht ener0y tra(e'in0 in the c'a##in0 is ca''e#
a. ,o#a' #is&ersion b. ,ateria' #is&ersion c. Wa(e0ui#e #is&ersion #. ab'e #is&ersion
122. "he inner core of an o&tica' +ber is 33333 in co)&osition. a. G'ass or &'astic b. o&&er c. i)eta'ic #. Liqui#
