All-Optical Wavelength Conversion for NRZ-OOK Signal based on - - PowerPoint PPT Presentation

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All-Optical Wavelength Conversion for NRZ-OOK Signal based on - - PowerPoint PPT Presentation

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All-Optical Wavelength Conversion for NRZ-OOK Signal based on Four-Wave Mixing in a Silicon Waveguide Simon Lindsthl & Elias Riedel Grding Supervisors: Prof. Gao Shiming and Yang Xiong, Laser group Centre for Optical and Electromagnetic

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SLIDE 1

All-Optical Wavelength Conversion for NRZ-OOK Signal based on Four-Wave Mixing in a Silicon Waveguide

Simon Lindståhl & Elias Riedel Gårding

Supervisors: Prof. Gao Shiming and Yang Xiong, Laser group Centre for Optical and Electromagnetic Research, Zhejiang University

June 28 – July 15, 2016

Simon & Elias (Laser group) Wavelength conversion by FWM June 28 – July 15, 2016 1 / 13

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SLIDE 2

Introduction

Fibre optical communications

Advantages High bandwidth Low loss but All-optical systems not fully developed Cannot transfer high power

Simon & Elias (Laser group) Wavelength conversion by FWM June 28 – July 15, 2016 2 / 13

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SLIDE 3

Introduction

OOK signals & wavelength conversion

On-off keying (OOK) No light is 0, light is 1. Simplest modulation format NRZ-OOK vs RZ-OOK Wavelength conversion To convert a beam to another wavelength preserving the signal. Allows wavelength division multiplexing Some components need specific input wavelengths

Simon & Elias (Laser group) Wavelength conversion by FWM June 28 – July 15, 2016 3 / 13

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SLIDE 4

Introduction

Four-wave mixing (FWM)

Nonlinear effect: depends on P = ε0χe E + PNL Parametric (instantaneous) process Two photons (ω1, ω2) in, two photons (ω3, ω4) out

Energy and momentum conservation

ω1 + ω2 = ω3 + ω4 frequency matching

  • k1 +

k2 = k3 + k4 phase matching

  • k = n(ω)ω

c

  • When ω1 = ω2: Degenerate FWM (ωi = 2ωp − ωs)

Simon & Elias (Laser group) Wavelength conversion by FWM June 28 – July 15, 2016 4 / 13

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SLIDE 5

Introduction

Components

Passive

◮ Attenuators ◮ Isolators (ISO) ◮ Optical couplers ◮ Polarization controllers (PC) ◮ Wavelength division multiplexers (WDM) ◮ Modulators ⋆ Mach-Zehnder modulator (MZM) (amplitude modulator)

Active

◮ Tunable lasers (TL) ◮ Amplifiers ⋆ Erbium doped fibre amplifier (EDFA) Simon & Elias (Laser group) Wavelength conversion by FWM June 28 – July 15, 2016 5 / 13

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SLIDE 6

Preparatory experiments

Generally educational

1 Fibre fusion splicing 2 Properties of passive components 3 Construction of a fibre laser 4 Properties of an optical amplifier

Directly preparatory

1 Continuous wave wavelength conversion (in fibre) 2 Modulation of an OOK signal Simon & Elias (Laser group) Wavelength conversion by FWM June 28 – July 15, 2016 6 / 13

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SLIDE 7

Main experiment

Setup

Simon & Elias (Laser group) Wavelength conversion by FWM June 28 – July 15, 2016 7 / 13

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SLIDE 8

Main experiment

Setup

TL1 ISO PC1 HP-EDFA1

Data in Bias

MZM TL2 ISO WDM1

COM Pass (1553.38 nm) Refl. Discard

HP-EDFA2

HP-ISO

WDM2

COM

PC3 PC2

Refl. Pass (1550.80 nm)

PC4 SOI PBS Output Signal Generator Microwave Amplifier

Clock out Data out

HP-ISO

Simon & Elias (Laser group) Wavelength conversion by FWM June 28 – July 15, 2016 8 / 13

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SLIDE 9

Main experiment

Measurements (optical spectrum analyser)

TL1 ISO PC1 HP-EDFA1

Data in Bias

MZM TL2 ISO WDM1

COM Pass (1553.38 nm) Refl. Discard

HP-EDFA2 HP-ISO WDM2

COM

PC3 PC2

Refl. Pass (1550.80 nm)

PC4 SOI PBS Output Signal Generator Microwave Amplifier

Clock out Data out

HP-ISO

(a) Continuous (b) OOK signal (c) Filtered OOK signal

Simon & Elias (Laser group) Wavelength conversion by FWM June 28 – July 15, 2016 9 / 13

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SLIDE 10

Main experiment

Measurements (power levels)

TL1 ISO PC1 HP-EDFA1

Data in Bias

MZM TL2 ISO WDM1

COM Pass (1553.38 nm) Refl. Discard

HP-EDFA2 HP-ISO WDM2

COM

PC3 PC2

Refl. Pass (1550.80 nm)

PC4 SOI PBS Output Signal Generator Microwave Amplifier

Clock out Data out

HP-ISO

(dBm) CW OOK Signal after PBS 17.84 15.7 Pump after PBS 25.1 26.16 Combined after SOI 23.3 23.71 Converted signal: −20 dBm = 10 µW PdBm = 10 log10

  • P

1 mW

  • 0 dBm

30 dBm 1 mW 1 W

Simon & Elias (Laser group) Wavelength conversion by FWM June 28 – July 15, 2016 10 / 13

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SLIDE 11

Main experiment

Measurements (oscilloscope)

TL1 ISO PC1 HP-EDFA1

Data in Bias

MZM TL2 ISO WDM1

COM Pass (1553.38 nm) Refl. Discard

HP-EDFA2 HP-ISO WDM2

COM

PC3 PC2

Refl. Pass (1550.80 nm)

PC4 SOI PBS Output Signal Generator Microwave Amplifier

Clock out Data out

HP-ISO

(a) Before EDFA (b) After EDFA (c) After WDM2

None available for the converted signal!

Simon & Elias (Laser group) Wavelength conversion by FWM June 28 – July 15, 2016 11 / 13

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SLIDE 12

Thank you!

Simon & Elias (Laser group) Wavelength conversion by FWM June 28 – July 15, 2016 12 / 13

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SLIDE 13

Image sources

By http://www.ictas.vt.edu - http://www.ictas.vt.edu, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=45474605 http://www.geeky-gadgets.com/wp-content/uploads/2011/09/ wicked-lasers-krypton.jpg http://pigselectronics.com/images/ INFINITER-100-Red-Laser-Pointer-Silver-Perfect-Gift-Ideas-for- jpg

Simon & Elias (Laser group) Wavelength conversion by FWM June 28 – July 15, 2016 13 / 13