6. A single mode fiber has a material dispersion of 18
ps/nm-km and a waveguide dispersion of -15
ps/nm-km. What is the total chromatic dispersion?
6. A single mode fiber has a material dispersion of 18 ps/nm-km and a waveguide dispersion...
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).
3. An instantaneous pulse travels through a SM fiber that is 50 Km long. The fiber has a chromatic dispersion of 9 ps/nm-km. The laser source has a spectral width of 0.5 nm. What is the length of the pulse at the end?
Consider a step index single mode fiber with a length of 100km. The core index being 1.46, and the cladding index 1.45 and a loss of .20dB/km at a wavelength of 1550nm. The dispersion coeffcient of this fiber at 1550nm is D = 1.5. For a high speed data with .8nm spectral width what is the group velocity delay?
1. An instantaneous pulse travels through 25 km of MM fiber with a total dispersion of 9ns/km. What is the pulse length at the end of the fiber?
A fiber manufacturer specifies a PMD coefficient of 0.05 ps km-1/2. (a) What is the average Differential Group Delay, DGD, after transmission through 200 Km of this fiber. (b) What is the average pulse spread after transmission through 200 Km of this fiber. (c) What is the estimate for maximum Bitrate of data that can be transmitted through this fiber if the only dispersion mechanism was PMD? (c) What is the bit period for 10 Gb/s of data? (d) If...
A fiber has a loss of 0.5 dB/km at a wavelength of 1550 nm. How much power is transmitted through such a fiber (at a wavelength of 1550 nm) if the length of the fiber is 1 km, 10 km, or 100 km if 5 mW is coupled into the fiber?
A fiber has a loss of 0.5 dB/km at a wavelength of 1550 nm. How much power is transmitted through such a fiber (at a wavelength of 1550 nm) if the length of the fiber is 1 km, 10 km, or 100 km if 5 mW is coupled into the fiber?
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...
2.7 Optoelectronics and Photonics
2.7 Consider a dielectric slab waveguide that has a thin GaAs layer of thickness 0.2 μm Dielectric slab waveguide between two AlGaAs layers. The refractive index of GaAs is 3.66 and that of the AlGaAs layers is 3.40. What is the cutoff wavelength beyond which only a single mode can propagate in the waveguide, assuming that the refractive index does not vary greatly with the wavelength? If a radiation of wavelength 870 nm (corresponding to bandgap...
i) A fiber has an optical loss of 0.3 dB/km. What is the optical loss of a 150 km length of this fiber in units of dBs? ii) If 1 mW of optical power at a wavelength of <lambda> = 1550 nm is coupled into this fiber, what will the output power be after 50 km?