Optoelectronics dr Konstanty Marszałek Dense Wavelength Demultiplexing – DWDM Gain Flattening...

Optoelectronics dr Konstanty Marszałek

• Dense Wavelength Demultiplexing – DWDM

• Gain Flattening Filter – GFF

• Coarse Wavelength Demultiplexing – CWDM

• Microoptics – Fibers ,lenses etc

Applications of thin film filters

Long distance fiber telecomunication lines


DWDM filter


Incoming light

Reflectedlight

Transmitted light

The number of the Cavity layesr in the thin film filter inlfuence of the efficiency. Amplitude characteristic of the filter with greater numbers of cavity layers has more rectangular shape, energy dissipated by reflectance is decreasing and efficiency of the filter is increasing


Contents:•White light source•Single common detector (InGaAs)•OMS monochromator 750 MMO - - 1400-1700 nm• temperature stabiliser for 750 MMO

OMS 3000

Optoelelectronics dr Konstanty Marszałek

Ion current density


CTE 20-80 C[10-6 /K]

Young ModulusE [GPa]

T-shift @ 1550nm [pm/K]

Substrate 1 9.8 55 1,0

Substrate 2 10.1 77 0,2

Substrate 3 10.1 85 0,0

Substrate 4 (-) (-) -1,3

Substrate 5 11.0 96 -1,9

Substrate properties for DWDM

DWDM deposition space•Space anode/cathode APS•Ta2O5

Controll of the deposition parameters•SiO2

•Ta2O5

•Position of the substrate


DWDM technology::•200 GHz – 4 cavity, Single channel•100 GHz – 4 cavity, Single channel•50 GHz – 3 cavity, Single channel

e:•100 GHz – 5 cavity•50 GHz – 4 cavity

Single channel parameters 100 GHz:•Mid frequency in the band C i L•Tolerance of mid frequency in band 0,05 [nm]•Incidence angle 0 •Max. Band transmitance -0,5 [dB]•Width of transmitance band –0,5 dB 0,45 [nm]•Width of transmitance band –25 dB 1,2 [nm]•Wavelength shift (20 - 80 ) 0,001 [nm/ C]•Radius of working surface 15 [mm]


Single channel characteristic 50 GHz

Characteristic of a single, 4 cavity channel 100 GHz


Mapping station for investigations of thin films filter parameters


EDFA – Amplifier

GFF – [Gain Flattening Filter]

Final characteristic of the EDFA amplifiers and filter GFF.


Used technologies depend on the size of the networks: 100 – 300 km Reginal networks IOF DWDM, GFF, CWDM (?)20 – 100 km Acces networks DWDM, GFF, CWDM (?)5 – 20 km Local networks CWDM

CWDM networks distance is larger then 60 km (without EDFA amplifiers).

Comparison DWDM – CWDM technology

DWDM•High costs

Devices :•Regenerators•Optical amlifiers•Lasers with temperature stabilisers•Multiplexsers (DWDM)•Demultiplexsers•Optical Multiplexser add/drop•Switch•Cross connectors•Amplifying correctors•Dispersion compensator

Additional Properties:•band: 1530 – 1625 nm•T-shift < 1 pm/ C•Unlimmited number of chennels 10 Gbit/s

CWDM•Low costs

Devices :

•Lasers without cooling•Multiplexser (CWDM)•Demultiplexsers•Optical Multiplexer add/drop•Switch

Additional Properties:•Band: 1300 - 1600 nm•T-shift [-10..70 C] - dopuszczalne 6 nm•2004-5: 4 channels 2,5 Gbit/s Current: 10 channels 10 Gbit/s


SYRUSpro C1200

Optoelectronics dr Konstanty Marszałek Dense Wavelength Demultiplexing – DWDM Gain Flattening...

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