so,
so,
Bandwidth
product for an optical fiber m-1 and optical e the bandwidth and length with chromatic dispersion coefficient 8pskm-...
8. A 1550 nm optical link uses a standard single-mode fiber with dispersion parameter of 4 ps/nm/km (Chromatic Dispersion), and a laser source with a linewidth of 0.5 nm. Assuming the link carrier is a 10 Gbits/s binary signal, estimate the maximum length of optical fiber required before dispersion compensation is required. (Assume the maximum spread is half the time interval between each bit).
Photonics and Optical Revision Sheet 1 1. Caculate the photon energy in eV for a wavelength of 1.55 um 2, A 1.55 μm digital communications system operating at 4 GBits/s receives an average power of -24 dBm at the detector. On the assumption that 1 and 0 bits are equally likely to occur how many photons are received within each 1 bit? 3. A1.3 um digital communications system operating at 3 GBits/s receives an average power of -29 dBm at...
1. Plastic optical fiber (POF) is a low-cost alternative to standard fiber optic cable.The core is of either Poly(methyl methacrylate) or Polystyrene and the cladding is usually of silicone resin.Typically POFs have a large core size, making them easy and cheap to connectorize and couple to laser diodes but they have a low bandwidth-distance product and high attenuation. a) Search the web and find typical values for the bandwidth-distance product and attenuation of step index plastic optical fiber. How do...
(a) The optical gain coefficient of a semiconductor laser with 150 μm cavity length is shown in Fig 1. The loss coefficient and the refractive index of the semiconductor laser are 21.6 cm" and 3.5 respectively. Find (i)The minimum gain coefficient required for lasing (ii) The frequency separation between the longitudinal modes of the laser (iii) The number of longitudinal modes emitted (b) This laser is required to produce a single mode output at a wavelength of 1.32 unm If...
A 1 m length dye laser emitting around 500 nm has a 1 nm bandwidth. How many longitudinal modes can the laser have?
1.The minimum wavelength and the minimum wave length for visible light is about 0.4 um and 0.7 um, respectively . Assume that the velocity of light is a constant of 3.0x10^8 m/s and Planck's constant is 4.13x10^-15 eV-s. What kind of material will appear colored? (a)The material with band gap of 1.0eV (b)The material with band gap of 2.0eV (c)The material with band gap of 3.2eV (d)The material with band gap of 3.5eV 2.Which kind of material is most likely...
2-1: GaAs has a refractive index of 3.68 and an absorption coefficient of 1.3x10 m' at 800 nm. Calculate the transmission coefficient and optical density of a GaAs plate of thickness 2.0 micrometers 2-2: The complex dielectric function of a metal at IR frequency can be described by the following: w, +i Eow where E, is the relative static dielectric constant, o is the w and is the angle frequency. Estimate the reflectivity of a silver mirror electrical conductivity, at...
PROBLEM 17.113 The slender rod AB of length L = 1 m forms an angle B = 30° with the vertical as it strikes the frictionless surface shown with a vertical velocity 7 = 2 m/s and no angular velocity. Knowing that the coefficient of restitution between the rod and the ground is e = 0.8, determine the angular velocity of the rod immediately after the impact.
Figure 1 shows a system comprising a bar with mass m=12 kg and
the length of the bar L=2 m, two springs with stiffness k_t=1000
N-m/rad and k=2000 N/m, one damper with damping coefficient c=50
N-s/m and two additive masses at the end of the bar, where each
mass (M) is equal to 50 kg. The rotation about the hinge A,
measured with respect to the static equilibrium position of the
system is θ(t). The system is excited by force...
1. ) An Erbium Doped Fibre Amplifier (EDFA) consists of glass rod of length L = 7 m and effective cross-sectional area A = 12.5 um? (so that the optical volume is AxL). The concentration of Er3+ ions in the glass is N = 109 cm? We can represent Er3+ as a 3-level system as shown in the diagram below. The pump wavelength is 1480 nm and the emission wavelength is 1550 nm. Let Ni and N2 be the concentrations...