Fiber lasers and optoelectronic devices based on few layers of graphene Workshop CPqD / Bristol University Program Lúcia A. M. Saito Mackgraphe - Centro de Pesquisas Avançadas em Grafeno, Nanomateriais e Nanotecnologia Mackenzie Presbyterian University 2014
19
Embed
Fiber lasers and optoelectronic devices based on few layers of graphene - Lucia Akemi
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Fiber lasers and optoelectronic devices based on few layers of
graphene
Workshop CPqD / Bristol University Program
Lúcia A. M. SaitoMackgraphe - Centro de Pesquisas Avançadas em Grafeno,
Nanomateriais e NanotecnologiaMackenzie Presbyterian University
2014
Outline
Part I - Previous work:
• Actively mode-locking Erbium fiber lasers with meters and kilometers long
• In-field and in-laboratory 50 km ultralong Erbium-doped fiber lasers
Part II - Future Interests:
• Graphene Properties
• Graphene-based optical modulators
– Electroabsorption modulator based on monolayer graphene
Pulse Width as a function of Dispersion and Cavity Length
6
Analysis of Dispersion and Nonlinearity LengthSetup Lcav LD (km) LNL (km) Lcav / LD Lcav / LNL Analysis
1 16.4 m 36.59 3.06 0.0005 0.0054 I – Neither dispersive nor
nonlinear effects2 51.6 m 12.54 2.41 0.0041 0.0214
3 218.0 m 12.74 2.61 0.0171 0.0835
4 1.4 km 11.63 2.56 0.1204 0.5469 II – Nonlinearity-dominant regime
(Lcav ~ LNL)5 3.0 km 13.49 2.73 0.2224 1.0989
6 12.6 km 14.36 2.80 0.8774 4.5000III – Dispersion
(Lcav ~ LD)and nonlinearity-dominant regime
(Lcav > LNL)
7 25.3 km 18.82 3.26 1.3443 7.7607
8 50.6 km 44.26 4.92 1.1432 10.2846
9 75.7 km 65.85 6.00 1.1496 12.6167
10 100.8 km 83.74 6.76 1.2037 14.9112
7
Possibility of soliton formation in all cavity setups.
Analysis of Soliton Power and Soliton Period as a function of D and Lcav
The parameter Z / Lcav is constant (~1.35) for ultralong cavities.
Analysis of Output Spectrum
The profiles of the spectrums confirm the dynamics of pulses in ultralong cavities. 8
9
In-field(Kyatera Network)
50 km Ultralong Erbium Fiber Lasers(in-lab and in-field)
10
Dispersion and nonlinear effects change the pulse duration at low modulation frequency.
Pulse duration is shorter than
expected by theory
Output Pulse Width as a functionof Modulation Frequency
Future Interests:Optoelectronic devices based on
few layers of graphene
K. S. Novoselov et al., Nature Vol. 490, p.192 (2012).
Graphene-based photonics applications:Possible application timeline, enabled by continued advances in graphene technologies, based on projections of products requiring advanced materials such as graphene. The figure gives an indication of when a functional device prototype could be expected based on device roadmaps and the development schedules of industry leaders.
12
Graphene Properties• High-speed operation. Graphene-based electronics may have the
potential to operate at THz, depending on the carrier density and graphene quality.
• Strong light-graphene interaction. In comparison to compound semiconductors, a monolayer of graphene possesses a much stronger interband optical transition.
• Broadband operation (300 to 2500 nm for SLG). The optical absorption of graphene is independent of wavelength.
M. Liu et al., Nature, Vol. 474, p.64 (2011).
Objective: to investigate optoelectronic properties and to develop the photonic devices based on few layers of graphene.