Optical Fibers and Cables - University of Houstoncourses.egr.uh.edu/ECE/ECE6323/Class...
Transcript of Optical Fibers and Cables - University of Houstoncourses.egr.uh.edu/ECE/ECE6323/Class...
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ECE 6323
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Introduction and concepts
Types of devices
Passive splitters, combiners, couplers
Wavelength-based devices for DWDM
Modulator/demodulator (amplitude and
phase), compensator (dispersion)
Others: switch, high-functional modules,
photonic integrated circuits (PIC)
Summary
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What uses are of photonic devices
and circuits?
The new (DWDM) vs. the old optical
communication
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Old vs. new optical network
Laser transmitter
EO regenerator
Optical amplifier
Baseband electronic circuit switch, TDM TM, ADM, DXC (SONET/SDH, ATM, IP)
(C,D,UD)wavelength division mux.
Lambda-switch/route, optical circuit switch, OADM, OXC, + electronic capabilities
Old
New
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DWDM & OA for trunking
Trunking technology!
100 channel x 20 Gb/s = 2 Tb/s
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The enabling technology…
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Optical/DWDM networking technology
Transmitter WDMux Fiber Optical amplifier
Optical switch Receiver
•Convent. fiber •DSF, NZDSF •Improved fiber
•Path switch •Add/Drop mux • l-router •Cross connect •Couplers •circulators
•Laser -DFB, DBR, VCSEL -Tunable, fiber
•TF filters •Fiber Bragg G •Array wave-guide grating •Diffraction G •Other gratings
•Erbium-doped Fib. Amp (EDFA) •Semicond. (SOA) •Others (Raman)
•Ultrafast PD
Modulator -Electro-optic -Electroab-sorption
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What uses are of photonic devices and circuits?
More than just being transmitted and received, light signals need processing: Signal combining, splitting
Controlling of wavelength, amplitude, phase
Switched
Other processing (e. g. 3R, 4R)
Photonic devices and circuits enable the processing of light signals
Knowing what it does (more important than how it works)
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Introduction and concepts
Types of devices
Passive splitters, combiners, couplers
Wavelength-based devices for DWDM
Modulator/demodulator (amplitude and
phase), compensator (dispersion)
Others: switch, high-functional modules,
photonic integrated circuits (PIC)
Summary
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The simplest among devices: just split a signal into many channels: lower power (1/N), but same everything else. Reverse for the combiner.
Can be done with fibers or on a planar waveguide
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Splitter/combiner/coupler Simplest 1-2 or 2-1 coupler
Coupler – 1 x N or Nx1
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Splitter/combiner/coupler
Star coupler – N x M
Fiber star coupler – N x M
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Example applications of passive s/c
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Wavelength-based devices for DWDM
Functional concepts:
Basic: filtering: select/separate one wavelength or a
wavelength range from the rest
More general concept: Wavelength division
multiplexing/demultiplexing: separate or combine
many wavelength channels into
Devices:
Thin-film interference filter
Grating: planar, array waveguide, Bragg
Wavelength-division coupler (mux/demux)
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Example of applications
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Thin-film interference filter
• Principle of Fabry-Perot cavity (similar to laser)
• Very thin film, short cavity ~l/2, l, 3l/2 …
• Multiple-coupled cavities, from 3 to 7 or more
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Thin film filter for WDM
200 GHz
•90 to 150 layers, 3 to 7 cavities
•Plasma assisted deposition (covalent-like bonding instead of Van der Walls)
•Advanced in-situ monitoring
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Thin-film interference filter applications
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WDM channel filter
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Grating: fiber Bragg (FBG)
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Grating: fiber Bragg (FBG)
Source: NEL, Infibers
FBG: Use in numerous apps: WDM coupler, disp. comp., sensors
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Review: Other applications of Bragg grating
• Also with integrated Bragg grating (BG) BUT different from DFB:
DBR is used as a narrow band mirror
• Similar with DFB about fabrication sensitive: but slightly more
tolerance
• Also fine tuning frequency with temperature or internal phase
segment when operated
• Less popular than DFB, but a variation is with Bragg fiber grating is
also useful
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Grating: Diffraction Grating
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Diffraction grating equation
l md sinsin
(note: the angles are algebraic: CCW: positive, CW negative)
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Grating: diffraction grating for WDM
Application:
• Split a multi-wavelength channel into many channels,
each with a unique wavelength (demux)
• And vice versa (mux)
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GRIN lens Special diffractive optical element (phase plate)
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Diffraction grating: other applications
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DG : Example of other application:
tunable laser
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Array waveguide grating
• Same principle as diffraction grating, except that
the path delay is controlled by waveguide length
s
g
wg nd
nL
d
d
ll
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Grating: AWG
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Grating: array waveguide (AWG)
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Grating: very large AWG
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Modulator
• Phase modulation is often used to convert into
intensity modulation with a device like a MZ
interferometer or ring resonator
• Light can be modulated on its
intensity, phase or frequency
• For optical communication,
most common is intensity
modulation
• Modulation can be direct on a
laser (rare) or through an
external absorber: electro-
absorption modulation
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Electroabsorption modulator (EAM) • Principle: application of an electric field to
semiconductor QW changes the energy levels, hence
the absorption wavelength spectrum
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EAM device configuration
Waveguide geometry Vertical geometry
• Majority devices are in waveguide geometry, often
integrated with a laser
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Electroabsorption modulator device
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EAM applications
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Some advanced EA modulator design
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Mach-Zehnder interferometer (MZI) electro-
optic modulator
Ern
n2
3
The electro-optic effect:
refractive index changes
as a function of E field
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MZI structure
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Mach-Zehnder Electro-optic modulator
• LiNbO3 still is the #1 seller • Semiconductors in specialized cases
Ch 1 Ch 2
Ch 4
Ch 5 Ch 6
Ch 7 Ch 8
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MZI Electro-optic modulator: advanced
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Ring-resonator electro-optic modulator
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Optical isolator and circulator
• It is desirable to prevent light going backward
(especially into lasers) that causes instability
• A device that allows light to go one way, but not on
reverse is called an optical isolator
• More than the importance of isolating light to
prevent feedback: isolator can be made into
circulator: allowing light to travel (circulate) through
several devices one way but not the other.
• The most important isolator/circulator design is
based on Faraday rotation: a magneto-optical
effect
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Optical isolator and circulator Faraday rotation
In some crystal, light polarization is
rotated when it is applied by a
magnetic field: magneto-optical effects
dBv
Verdet’s constant
d
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Optical isolator based on Faraday
rotation
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Another explanation
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Other optical isolator design
This design is strongly polarization-dependent: it
works only for the indicated polarization (PBS is
sometimes not preferred)
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Other optical isolator design
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Optical circulator
in
out
Coupled port
Coupled port
• Light travels one way, not the other
• Usually 3 or 4 ports can be add/drop
• Designed for low polarization-dependence
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Fiber optics optical circulator design Polarization insensitive
Application 1: amplifier
Application 2: Disp comp.
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Example applications of optical circulator
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Interferometer switch (cross bar)
Source: BBV simulation
• E-O, Thermo-optic, AO switch
• Can also be designed for l-
switching
• Oxide (LiNbO3), EO
organic/polymers, SOI, Polyimide
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1 x 8 Polymeric Digital Optical Switch
55 mm
SW SW SW
heater
1x2 SW
waveguide
10 mm
Si
core (7x7 µm)
clad fluorinated polyimide
0.1°
Source: Hitachi Central Research Lab.
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MEMS mirror switch
Lucent WaveStar™ mirror
Source: Optical Micromachine
• “high-tech” incarnation of electromechanical telephone CO switch
• can be very important in restoration
Source: AT&T Labs
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Photonic wafer and chip
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ROADM: Functional concept
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ROADM in Network applications
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ROAD concepts
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ROADM
Application of Bragg
grating coupler
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ROAD concepts
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ROADM with Optical Cross Connect
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Introduction and concepts
Types of devices
Passive splitters, combiners, couplers
Wavelength-based devices for DWDM
Modulator/demodulator (amplitude and
phase), compensator (dispersion)
Others: switch, high-functional modules,
photonic integrated circuits (PIC)
Summary
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A wide range of devices that perform all key functions in a modern optical communication network: end-to-end
Crucial in enabling advanced network architecture (compared to old optical communication system) by offering unique functionality along with practicality
The shaping, conditioning of light will continue to be the most important technology in future optical communication