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3 WDM * OADM MUX/DEMUX EDFA Er + Doped Fiber Isolator Isolator GFF WDM Coupler 1.48 um LD 1.48 um LD Transmitter Receiver MUX EDFA OADM DEMUX Switch

4 Fiber Optics Micro Optics Waveguide Optics Isolator, Circulator, Collimator O DWDM O O O OADM O O O Attenuator O O O Interleaver O O O Wavelength Locker O O O Tunable Filter O O O Switch O O Power Splitter (Coupler) O O PM Compensator O O Modulator O O

5 Collimator &

6 Performance Reliability Cost / Unit To manufacture Application Thin Film Waveguide Fiber Grating -used for WB and NB -Good for low channel count -passive -Reliability only Dependnt on Packaging -Effective for low Channel counts -MUX/DEMUX -Fixed OADM -Wideband EDFA -50 GHz application with high channel count -requires heater or temperature stabilizer package -Great for high Channel counts -MUX/DEMUX -Great for low channel count applications -requires heater or temperature stabilizer package -provides a hybrid solution for low channel counts -MUX/DEMUX -Tunable OADM

7 l2 l1, l2, l3 l2 Drop l2

8

9 1xN AWG Mux/Demux

10 Fused Fiber Coupler Fused Region Down Taper Up Taper Two coupler combined All-Fiber Mach-Zehnder Interferometer λ1,λ2,λ3,......,λ14,λ15,λ16 λ1,λ3,λ5,... λ13,λ15 λ2,λ4,λ6,... λ14,λ16 Example of 1x16 Multiplex λ1,λ5,λ9,λ13 λ3,λ7,λ11,λ15 λ2,λ6,λ10,λ14 λ4,λ8,λ12,λ16 λ1,λ9 λ5,λ13 λ3,λ11 λ7, λ15 λ2, λ10 λ6, λ14 λ4, λ12 λ8, λ16 λ1 λ9 λ5 λ13 λ3 λ11 λ7 λ15 λ2 λ10 λ6 λ14 λ4 λ12 λ8 λ16 For N wavelength, N-1 coupler needed

11 TYPE $Mil % $Mil % $Mil % Thin film interferometer Bragg Fiber Grating Array Waveguide Grating Other Thechnology Total Source:Electroniccast Corp.

12 l 1 l n l 1 l n circulator Drop Add Drop Add

13 Input l 1 A, l 2, l 3, l 4 Add port l 1 B Drop port l 1 A Output l 1B, l 2, l 3, l 4

14 DEMUX 2x2 switches MUX. Transponder ( Rx + Tx) ADD DROP

15 Million $ Yr.

16 DEMUX 2x2 switches MUX EDFA. VOA VOA EDFA Transponder ( Rx + Tx) ADD DROP

17 - - *

18

19 Optical output PD (b) PD (a) Locking frequency Frequency [GHz]

20 - - * Santec, JDS Uniphase wavelength locker * JDS Uniphase wavelength locker * Nortel

21 power (dbm) Bragg wavelength (nm)

22 λ λ λ λ λ TE TM TM TE LiNbO 3 λ λ λ output TE TM TM TE λ λ Drop signal

23

24

25

26

27 1. 2. ( Eye-pattern) ( Eye-pattern)

28 - *.. - *,, Half-Wave Plate Quarter-Wave Plate Liquid Crystal. * LiNbO3 LiTaO3,. LN wafer mode converter phase shifter

29 Optical Modulator

30 Optical Modulator, :,, LAN, CATV

31 Optical Modulator EA Modulated DFB laser(iii-v) LiNbO3 Modulator Trench Distributed feedback laser section Electroabsor ptionmodulated laser p-inp/ingaas Current Blocking Layers n-inp substrate Grating InGaAsP Multiquantum Well Layers Low driving voltage(2~3v) No polarization maintaining fiber Compact, Cost-effective, Integrated with LD Lucent tech, Alcatel, Samsung Elec. High speed (2.5~40Gbps) Polarization dependents(pmf required) Adjustable chirp, Long distance transmission Lucent tech, Sumitomo cemement,gec

32 JDS uniphase NEL 1 cost. Infra (,,, )

FTTH ๊ธฐ์ˆ ๋ฐœํ‘œ

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