Multiplexing

Multiplexing/De-MultiplexingPhoto imprinted Bragg Grating

Faisal Nadeem Department of Physics and Mathematics

University of Eastern Finland

Nov 27,2012

Faisal Nadeem An All Fiber Dense wavelength Division Multiplexer/De-Multiplexer using photoimprinted Bragg Gratings

Outline of Talk

• Motivation• Introduction• Operation • Results• Simulation• Fabrication of the• Devices• Conclusion• Questions


Motivation

Wavelength link with 100 GHz channel

spacing at 1550 nm

Extraction coupling efficiency

99.4%

individual wavelength channels

Return loss >23db

Adjacent channel Isolation

>20dB

Loss <.5dB


Introduction


• High performance wavelength Multiplexing/De-Multiplexing device.• Based on Mach zehnder interferometer with

photo induced Bragg gratings in the interferometer arm.

• Can be used to extract/or add wavelength channel from the transmission line.

Operation

• De-Multiplexer • Multiplexer


Operation as De-Multiplexer

input

Tab

1

2

3

4 output

λ6λ4

0

-25

-50

λ1λ2λ3λ4 λ6λ5 λ7

0

-50

-25

λ1λ2λ3λ4λ5 λ7

0

-25

-50(mdB

))out

putTap(dB m

)Input(dB m

)


UV Trimming

Identical Bragg Gratings resonant at λ4

3dB fused coupler

3dB fused coupler

Operation as Multiplexer

input

Tab

1

2

3

4 output

λ4

0

-25

-50

Input(dB m)


UV Trimming


3dB fused coupler

3dB fused coupler

λ1λ2λ3λ4λ5 λ7

0

-25

-50

Input(dB m)

λ1λ2λ3λ4 λ6λ5 λ7

0

-50

-25

(mdB

))out

put

Add

Due to Symmetry Cross

Talk occurs

Tap Efficiency Measured at Port 2


Seven Channel WDM Simulation

input

Tab

1

2

3

4 output


UV Trimming


3dB fused coupler

3dB fused coupler

Fabrication of the device


Interferometric Photowriting Setup


Grating writing Techniques


C.Y. Wei et al (2002)AFM observation of surface topography of fiber Bragg gratings fabricated in germanium–boron codoped fibers and hydrogen-loaded fibers, Optical Materials , Vol:20, P 283-294

http://www.sciencedirect.com/science/article/pii/S0925346702000708


Fiber Bragg grating based devices


R.T. Schermer et al., Opt. Exp., 19, 6, 5371 (Mar. 14, 2011).Jharna Mandal et al. (2005) Fiber laser-based temperature sensor systems using uniform wavelength-matched Bragg grating reflectors, Sensors and Actuators A: Physical,Vol.120, Pages 451-461



http://www.sciencedirect.com/science/journal/09244247

http://www.sciencedirect.com/science/journal/09244247

Conclusion

• Multiplexing/Demultiplexing device for 100 GHz dense wavelength at 1550 nm.

• Mux/de Mux showed high preformance• Can be improved further by writing more than

one grating pair.


Questions????


oh oh- i am Control Freak

"Recommend that you change YOUR course 15 degrees to the South to

avoid a collision."

Multiplexing

Investor Relations

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