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

Optoelectronics dr Konstanty Marszałek DWDM filter

Optoelectronics dr Konstanty Marszałek Incoming light Reflected light 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

Optoelectronics dr Konstanty Marszałek Contents: White light source Single common detector (InGaAs) OMS monochromator 750 MMO nm temperature stabiliser for 750 MMO OMS 3000

Optoelelectronics dr Konstanty Marszałek Ion current density

Optoelectronics dr Konstanty Marszałek CTE   C [10 -6 /K] Young Modulus E [GPa] 1550 nm [pm/K] Substrate ,0 Substrate ,2 Substrate ,0 Substrate 4(-) -1,3 Substrate ,9 Substrate properties for DWDM DWDM deposition space Space anode/cathode APS Ta 2 O 5 Controll of the deposition parameters SiO 2 Ta 2 O 5 Position of the substrate

Optoelectronics dr Konstanty Marszałek 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 (  )  0,001 [nm/  C] Radius of working surface  15 [mm]

Optoelectronics dr Konstanty Marszałek Single channel characteristic 50 GHz Characteristic of a single, 4 cavity channel 100 GHz

Optoelectronics dr Konstanty Marszałek Mapping station for investigations of thin films filter parameters

Optoelectronics dr Konstanty Marszałek EDFA – Amplifier GFF – [Gain Flattening Filter] Final characteristic of the EDFA amplifiers and filter GFF.

Optoelectronics dr Konstanty Marszałek

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: nm T-shift [  C] - dopuszczalne 6 nm : 4 channels 2,5 Gbit/s Current: 10 channels 10 Gbit/s

Optoelectronics dr Konstanty Marszałek SYRUSpro C1200