Fiber Optics Questionnaire

GROUP STUDY – FIBER OPTICS

1. What is is the frequency frequency of an an LED at 1.9eV? 1.9eV? a. 459 GHz b. 645 GHz c. ! "Hz #. 459 "Hz $. %n absor&tion absor&tion 'oss 'oss cause# by (a'ence (a'ence e'ectro e'ectrons ns in the si'ica )ateria )ateria'' fro) *hich the +bers are )anufacture#. a. ,o#a' #is&ersion b. -nfrare# c. 'tra(io'et #. -on /esonance . "he *a(e'en0 *a(e'en0th th of 'i0hts 'i0hts are (ery (ery short an# an# can be )easure# )easure# in in ter)s of  a. ,i''i)eter b. an0stro) c. )eter #. centi)eter 4. What is the the refrac refracti(e ti(e in#e in#e of air? a. 2.14 b. 2.$5 c. 1 #. $ 5. "he LED requir requires es 33333 33333 bias bias in or#er or#er to i''u)ina i''u)inate te a. /e /e(erse b. zero c. for*ar# #. +e# 6. a'cu'ate a'cu'ate the critica' critica' an0'e an0'e of inci#ence inci#ence bet*een bet*een $ substances substances *ith #ierent #ierent refracti(e in#ices *here n1  1.5 an# n$  1.46. a. !4.9 #e0rees b. !5.6 #e0rees c. !9.9 #e0rees #. !6.! #e0rees !. -t is a ty&e of +ber o&tic o&tic cab'e cab'e *herein *herein an in#e chan0es chan0es fro) fro) the core core to the c'a##in0. a. 7te& in#e b. sin0'e )o#e c. 0ra#e# in#e #. )u'ti)o#e 8. "hat #ie'ectri #ie'ectric c )ateria' )ateria' of an o&tica' o&tica' +ber surroun#i surroun#in0 n0 the core. core. a. 7hie'# b. o(er c. %r)or #. 'a##in0 9. Which of the the fo''o*in0 fo''o*in0 is not not an a#(anta0e a#(anta0e of a +ber +ber o&tic o&tic cab'e? cab'e? a. an#*i#th b. *ei0ht c. )obi'ity #. crossta': 12./eferre# to as a 'i0ht source of +ber o&tic cab'e *hich su&&'ies a &o*er 'e(e' of 5 to ! )* an# ha(in0 a narro* s&ectru) of e)ission. a. ;hoto#io#e b. rysta' #io#e c. -LD #. LED 11.What #o you ca'' the 'oss in si0na' &o*er as the 'i0ht tra(e's #o*n the +ber? a. en#in0 b. scatterin0 c. attenuation #. &ro&a0ation 1$.Which of the fo''o*in0 #escribes the 'i0ht 0atherin0 ca&abi'ities of a +ber? a. Dis&ersion b. #iraction in#e c. refracti(e in#e #. nu)erica' a&erture 1.% ty&e of +ber 'oss #ue to the s)a'' surface irre0u'arities in the c'a##in0 *hich causes the 'i0ht to be reb. 1.$$  12e&=16 > c. 1.$8  12e&=19 > #. 1.6  12 e&=19 > 15."he )ost co))on #e(ice use# as a 'i0ht #etector in +ber o&tic co))unication syste). a. LED b. #ar'in0ton &hototransistor c. %;D #. ;- #io#e

16.% 'a* that states the re'ationshi& bet*een inci#ent an# refracte# rays. a. "yn#a'' eect 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. 7CE" 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. BDDb. Ethernet c. 7CE" #. Gi0E $$."his ta:es &'ace *hen 'i0ht stri:es a surface an# is con(erte# into heat throu0h an echan0e of ener0y *ith the ato)s of the surface. a. Diraction 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 $!. 7CE" 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&'ein0 $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