Fiber Optic Communications Communication Systems
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1 INTRODUCTION TO FIBER-OPTIC COMMUNICATIONS A fiber-optic system is similar to the copper wire system in many respects. The difference is that fiber-optics use light pulses to transmit information down fiber lines instead of using electronic pulses to transmit information down copper lines. The basic elements of any point-to-point communication system are a transmitter that generates the signal (LEDs or LASERs), a transmission medium that carries the signal (Fiber-Optic Waveguide) and a receiver that detects the signal and converts it into a useful form (photo detector). Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 1
2 THE OPTICAL SYSTEM AND SPECTRUM What we call light is only a small part of the spectrum of electromagnetic radiation. Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page
3 1) Enormous potential bandwidth. ADVANTAGES OF FOC ) Very high frequency carrier wave. (10 14 Hz). 3) Low Loss (attenuation as low as 0. db/km for glass) 4) Repeaters can be eliminated => low cost and reliability 5) Secure; cannot be trapped without affecting signal. 6) Electrically neutral; no shorts / ground loop required. applicable in dangerous environments. 7) Tough but light weight, Expensive but tiny. Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 3
4 FIBRE OPTIC CABLES What is a fiber optic cable? A fiber optic cable is a cylindrical pipe. It may be made out of glass or plastic or a combination of glass and plastic. It is fabricated in such a way that this pipe can guide light from one end of it to the other. A fiber optic cable is composed of two concentric layers termed the core and the cladding. The core and cladding have different indices of refraction with the core having n 1 and the cladding n. Light is piped through the core. A fiber optic cable has an additional coating around the cladding called the jacket. The jacket usually consists of one or more layers of polymer. Its role is to protect the core and cladding from shocks that might affect their optical or physical properties. It acts as a shock absorber. Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 4
5 SNELL S LAW n 1 sinφ 1 = n sinφ n 1 cosθ 1 = n cosθ Snell s law indicates that refraction can t take place when the angle of incidence is too large. (Let φ 1 =60 0, n 1 =1.5 and n =1.0. Can you calculate φ?) Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 5
6 TOTAL INTERNAL REFLECTION Chandratilak De Silva, LIYANAGE Page 6
7 LIGHT GUIDING Chandratilak De Silva, LIYANAGE Page 7
8 NUMERICAL APERTURE (NA) CALCULATION NA = (n 1 n ) 1/ Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 8
9 OPTICAL FIBER TYPES Fiber optic cable can be one of two types, multi-mode or single-mode. These provide different performance with respect to both attenuation and time dispersion. Chandratilak De Silva, LIYANAGE Page 9
10 OPTICAL FIBER TYPES Fiber optic cable that exhibits multi-mode propagation with a step index profile is characterized as having higher attenuation and more time dispersion than the other propagation candidates have. However, it is also the least costly and hence most widely used. Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 10
11 ATTENUATION When compared with other candidates for the Transmission Medium commonly employed today, Optical Fibre has comparison when it comes to attenuation, interference and bandwidth. Here frequency refers to the data rate. The attenuation of the fiber optic cables is much less. What is more their dependence upon frequency is even flat over quite a large range. You need not be concerned with the change in attenuation every time you decide to tweak the data rate. Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 11
12 ATTENUATION Attenuation is principally caused by two physical effects, absorption and scattering. Absorption removes signal energy in the interaction between the propagating light (photons) and molecules in the core. Scattering redirects light out of the core to the cladding. The three principal windows of operation, when propagating through a cable, are indicated. These correspond to wavelength regions where attenuation is low and matched to the ability of a Transmitter to generate light efficiently and a Receiver to carry out detection. The 'OH' symbols indicate that at these particular wavelengths the presence of Hydroxyl radicals in the cable material cause a bump up in attenuation. These radicals result from the presence of water. Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 1
13 ATTENUATION Mode Material Index of Refraction Profile λ microns Size (microns) Atten. db/km Bandwidth MHz/km Multi-mode Glass Step / Multi-mode Glass Step / Multi-mode Glass Graded / Multi-mode Glass Graded / Multi-mode Glass Graded / Multi-mode Glass Graded / Multi-mode Glass Graded / Multi-mode Glass Graded / Multi-mode Glass Graded / Multi-mode Glass Graded / Multi-mode Glass Graded / Multi-mode Glass Graded / Multi-mode Plastic Step / Multi-mode Plastic Step / Multi-mode Plastic Step / Multi-mode PCS Step / Single-mode Glass Step /80 or Single-mode Glass Step 850 5/80 or Single-mode Glass Step / * Single-mode Glass Step /15 0. * * Too high to measure accurately. Effectively infinite. (As of [4]) Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 13
14 NUMBER OF MODES (N m ) FOR A STEP INDEX FIBER N m is for a step index fiber is given by, N m = core diameter NA π 0.5 λ eg: NA = 0.9 (a typical value) D = 100µm λ = 850nm N m >> 1000 Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 14
15 NUMBER OF MODES (N m ) FOR A STEP INDEX FIBER (cont ) Each mode has its own characteristic velocity through a step index optical fiber. This cause pulses to spread out as they travel along the fiber. This is called modal dispersion. The more modes the fiber transmits, the more pulse spread out it has. The basic requirement for a single mode fiber is that the core be small enough to resist transmission to a single mode. Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 15
16 Chandratilak De Silva, LIYANAGE Page 16 NUMBER OF MODES (N m ) FOR A GRADED INDEX FIBER ( ) ( ) a r n n n a r a r n r n = = for for 1 ) ( α where r = radial distance from the fiber axis, a = the core radius, n 1 = refractive index of core axis n = refractive index of cladding. α = the shape of the index profile n n n n n n =
17 NUMBER OF MODES (N m ) FOR A GRADED INDEX FIBER (cont ) For α n() r n1 (step index) 1 α NA( r) = 0 where axial NA is defined as: [ ] n ( r) n NA(0) 1 ( r ) 1 [ ] ( n (0) n = n n ) n NA ( 0) = a for for r a r > a The number of modes for this case is given by, α N m = a k n1 where, k = π. α + λ Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 17
18 ELECTROMAGNETIC WAVE THEORY To analyze optical waveguides it is required to consider Maxwell s equations that give the relationship between electrical and magnetic fields. Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 18
19 CIRCULAR WAVEGUIDES TE (Transverse Electric) Mode The lower cutoff frequency (or wavelength) for a particular TE mode in circular waveguide is determined by the following equation: π r λ c,mn = (m) p mn where p' mn is m p' m1 p' m p' m Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 19
20 TM (Transverse Magnetic) Mode The lower cutoff frequency (or wavelength) for a particular TM mode in circular waveguide is determined by the following equation: π r λ c,mn = (m) p mn where p mn is m p m1 p m p m However detailed analysis of this will not be carried out here. Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 0
21 Fiber Optic Communications Communication Systems CIRCULAR WAVEGUIDE MODES Chandratilak De Silva, LIYANAGE Page 1
22 LEAKY MODES Some modes can propagate short distances in the optical fiber. Hence there are guided and unguided modes with respect to a given optical fiber. Modes that are just beyond the threshold for propagating in a multimode fiber can travel for short distances in the fiber cladding. The difference between the highest-order modes guided in a multimode fiber and the lowest order modes that are not guided is quite small. Hence slight changes in conditions may allow light in a normally guided mode to leak out of the core. Slight bends of a multimode fiber are enough to allow escape of these leaky modes. Likewise some light in the cladding mode may be recaptured due to the bends. Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page
23 TRANSMITTERS IN OPTICAL FIBER SYSTEMS The Transmitter component of an OF system serves two functions. First, it must be a source of the light coupled into the fiber optic cable. Secondly, it must modulate this light so as to represent the binary data that it is receiving from the Source. With the first of these functions it is merely a light emitter or a source of light. With the second of these functions it is a valve, generally operating by varying the intensity of the light that it is emitting and coupling into the fiber. The Transmitter can be thought of as Electro-Optical (EO) transducer. An LED or a LD (Laser Diode) generates an optical beam with such dimensions that it can be coupled into a fiber optic cable. However, the LD produces an output beam with much less spatial width than an LED. This gives it greater coupling efficiency. Each can be modulated with a digital electrical signal. Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 3
24 TRANSMITTERS IN OPTICAL FIBER SYSTEMS Two methods for modulating LEDs or LDs are shown above. More on LED and LD will be studied separately. Chandratilak De Silva, LIYANAGE Page 4
25 RECEIVERS IN OPTICAL FIBER SYSTEMS The Receiver component of of an OF system serves two functions. First, it must sense or detect the light coupled out of the fiber optic cable then convert the light into an electrical signal. Secondly, it must demodulate this light to determine the identity of the binary data that it represents. In total, it must detect light and then measure the relevant Information bearing light wave parameters in the fiber optic data link context intensity in order to retrieve the Source's binary data. The very heart of the Receiver is the means for sensing the light output of the fiber optic cable. Light is detected and then converted to an electrical signal. Chandratilak De Silva, LIYANAGE Page 5
26 RECEIVERS IN OPTICAL FIBER SYSTEMS The demodulation decision process is carried out on the resulting electrical signal. The light detection is carried out by a photodiode. This senses light and converts it into an electrical current. However, the optical signal from the fiber optic cable and the resulting electrical current will have small amplitudes. Consequently, the photodiode circuitry must be followed by one or more amplification stages. Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 6
27 RECEIVERS IN OPTICAL FIBER SYSTEMS A complete Receiver must have high detectability, high bandwidth and low noise. It must have high detectability so that it can detect low level optical signals coming out of the fiber optic cable. The higher the sensitivity, the more attenuated signals it can detect. It must have high bandwidth or fast rise time so that it can respond fast enough and demodulate, high speed, digital data. It must have low noise so that it does not significantly impact the BER of the link and counter the interference resistance of the fiber optic cable Transmission Medium. Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 7
28 WAVELENGTH DIVISION MULTIPLEXING (WDM) Chandratilak De Silva, LIYANAGE Page 8
29 MULTILAYER THINFILM REFLECTOR USED FOR WDM Chandratilak De Silva, LIYANAGE Page 9
30 REFERENCES [1] Gerd Keiser, Optical Fiber Communications, McGraw-Hill. [] Jeff Hecht, Understanding Fiber Optics, Prentice Hall. [3] Fiber Optic Cable Tutorial, [4] K S Schnelder, Fiber Optic Data Communications for the Premises Environment, Chandratilak De Silva, LIYANAGE (L.desilva@massey.ac.nz) Page 30
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