WDM

Fakultas Teknik Elektro & Komunikasi 1

WDM

Ref : Keiser, Norio Kashima


WHY WDM ?

• Sumber optis memiliki lebar spektral

sempit

• Fiber memiliki lebar pita sangat lebar

• Peningkatan kebutuhan layanan

• Peningkatan utilitas/efisiensi fiber


Sumber optik tunggal menggunakan sebagian kecil pita

transmisi fiber

Fakultas Teknik Elektro & Komunikasi 4Presented By The Fiber Optic Association

©2004, The Fiber Optic Association, Inc.

Wavelength-Division Multiplexing


Sistem WDM unidirectional


Aplikasi WDM


Sistem WDM bidirectional


Elemen WDM dispersif sudut.


Bragg Grating


Prinsip Kerja FBG


Reflektor multilayer thin-film-filter

(Dichroic Filter)

Thin film : bahan dielektrik


Skema tuneable filtering


Wavelength tunable filter


Contoh WDM device


Perbandingan WDM device

TYPE EXAMPLES COUPLING

LOSS

(SM FIBER)

SIZE MASS PRODUCTION

Bulk Prism

Grating

Interferometer

optical filter

Holography

Passable Poor to

passable

Poor to

passable

Fiber Fused fiber

coupler

Excellent Passable

to good

Good

Waveguide Directional

coupler

Mach-zehnder

interferometer

Good Excellent Excellent


Pertimbangan perancangan WDM

ITEM FACTOR

Wavelength Fiber loss, device loss,

wavelength allocation

WDM device Cost, performance

Crosstalk Quality degradation, security

Service Possibility of interrupt

Bit rate Risetime and loss budget


CWDM

(Coarse)

DWDM

(Dense)

WWDM

(Wide)

Band 1310 – 1610 nm

(1270 – 1610) nm

1492,25 -

1611,79 nm

1310 – 1550 nm

Spacing 20 nm 0,75 nm > 50 nm

Light

Source

Accuracy eased

Whithout w.c.

Device choice

Wlength control

Accuracy eased

Whithout w.c.

WDM Filter Req eased Strict req Req eased

application Access network Core network Access network

WDM Comparison

WDM

Documents

Transcript of WDM