Wavelength Converters Wavelength Converters Presented by Eduardo - - PowerPoint PPT Presentation

Wavelength Converters Wavelength Converters

• Presented by Eduardo

Presented by Eduardo Gonzalez, Electrical Gonzalez, Electrical Engineering, Sr. Engineering, Sr.

• Mentor: Joe Summers

Mentor: Joe Summers

• Faculty Adviser: Daniel J.

Faculty Adviser: Daniel J. Blumenthal, Blumenthal, Ph.D Ph.D

• Funding: D.A.R.P.A.

Funding: D.A.R.P.A.

The Big Picture The Big Picture

• A

A Wavelength Wavelength Converter Converter is a device is a device that converts data from that converts data from

• ne incoming wavelength
• ne incoming wavelength

to another outgoing to another outgoing wavelength. wavelength.

• They are used in Fiber

They are used in Fiber Optic Communication Optic Communication Systems. Systems.

• WDM (Wavelength

WDM (Wavelength Division Multiplexing) Division Multiplexing) Networks: Transmit data Networks: Transmit data simultaneously at multiple simultaneously at multiple carrier wavelengths (or carrier wavelengths (or equivalently frequency). equivalently frequency).

Research Goals and Objectives Research Goals and Objectives

• Monolithically integrate widely tunable

Monolithically integrate widely tunable laser and a wavelength converter. laser and a wavelength converter.

• Demonstrate that any input wavelength

Demonstrate that any input wavelength can be converted to any output can be converted to any output wavelength. wavelength.

• Design Multimode Interference (MMI)

Design Multimode Interference (MMI) Devices (Optical Splitter). Devices (Optical Splitter).

• Test devices for optimization.

Test devices for optimization.

BeamProp Simulation and Data BeamProp Simulation and Data

• This software

This software monitors light monitors light through a chosen through a chosen pathway. pathway.

• Vary width and

Vary width and length to minimize length to minimize device area. device area.

• Look for 50%

Look for 50%

• utput on each arm.
• utput on each arm.
• Waveguide end

Waveguide end tapered to eliminate tapered to eliminate coupling. coupling.

Data in Converted Signal Out

π phase shift

Cross-Phase Modulation Principle

• Semiconductor optical

amplifiers used to achieve π phase shift

• Incoming data disturbs

phase balance ⇒ data conversion

Interferometer Interferometer -

• cross

cross phase modulation phase modulation

CW in No CW light out

Laser Tuning and Reflection Spectrum Laser Tuning and Reflection Spectrum

– – Changing the current in each Changing the current in each mirror changes it’s index. mirror changes it’s index. – – We make use of the reflection We make use of the reflection spectra to observe the spectra to observe the periodic mirror maxima. periodic mirror maxima. – – Inducing small index changes Inducing small index changes in one mirror relative to the in one mirror relative to the

• ther causes adjacent
• ther causes adjacent

reflectivity maxima to come reflectivity maxima to come into alignment. into alignment. – – Lasing occurs at the pair of Lasing occurs at the pair of maxima that are aligned. maxima that are aligned.

Front Mirror Front Mirror Gain Gain Phase Phase Rear Mirror Rear Mirror

B ack Front

1 2 3

Reflectanse Power

Wavelength

Laser Tuning Laser Tuning

1566 1566 20 20 3 3 1559 1559 1552 1552 3.7 3.7 24 24 1542 1542 4 4 1533 1533 20.2 20.2 21 21 1528 1528 20 20 24 24 (nm) (nm) ( (mA mA) ) ( (mA mA) ) Wave Wave-

• length

length I:Back I:Back Mirror Mirror I:Front I:Front Mirror Mirror

Future Plans Future Plans

• Test devices to observe successful

Test devices to observe successful wavelength conversion. wavelength conversion.

• Observe errors in data transmission using

Observe errors in data transmission using the BER detector. the BER detector.

• Test the devices at 40

Test the devices at 40 Gbps Gbps (Gigabits per (Gigabits per second) second)

Acknoledgements Acknoledgements

• Joe Summers, Daniel J. Blumenthal,

Joe Summers, Daniel J. Blumenthal, Ph.D Ph.D, , and Milan and Milan Masanovic Masanovic, Ph.D. , Ph.D.

• INSET Group: Trevor

INSET Group: Trevor Hirst Hirst, Nick Arnold, , Nick Arnold, Nick Northern, Liu Nick Northern, Liu-

• Yen Kramer, and

Yen Kramer, and Evelyn Evelyn Hu Hu. .