Why are electrical and optical bandwidth different?
The optical bandwidth is higher than the corresponding electrical bandwidth on a frequency response curve. This is simply due to the fact that electrical bandwidth is that frequency at which the voltage gain falls to 0.707 times it’s midband value which is generally considered to be 0 dB.
What is the relation between 3dB optical bandwidth and 3dB electrical bandwidth?
Therefore, when the optical power spectrum has dropped to its -3dB point, the corresponding electrical power spectrum has dropped to its -6dB point at exactly the same frequency. Optical bandwidth = -3 dB optical = -6 dB electrical.
What is bandwidth in optical fiber communication?
Bandwidth refers to the amount of data you can transfer in a unit of time, as well as the range of frequencies used to transmit the data. Fiber-optic bandwidth is high both because of the speed with which data can be transmitted and the range of frequencies over which data can travel without attenuation.
What is electrical bandwidth?
bandwidth, in electronics, the range of frequencies occupied by a modulated radio-frequency signal, usually given in hertz (cycles per second) or as a percentage of the radio frequency. The term also designates the frequency range that an electronic device, such as an amplifier or filter, will transmit.
What is the difference between optical and electrical?
The difference between the two phenomena is that Electrical conduction involves the resistivity of the material while optical conduction involves the dielectric constant of the material (and other parameters as the relaxation time…).
How is optical bandwidth calculated?
Optical bandwidth is defined as the frequency at which half the optical power is incident in the channel. Since power is measured in Watts we use 10*log10(W/Wo) to find the -3dB point. This is referred to as the optical decibel (dBo).
Does Fiber Optic have bandwidth?
Fiber links provide over 1,000 times as much bandwidth as copper and can travel more than 100 times further as well. A typical bandwidth-distance product for multi-mode fiber is 500 MHz/km, so a 500 meter cable can transmit 1 GHz.
What is the difference between bandwidth and linewidth?
While there may be stricter definitions for each term, colloquially bandwidth usually refers to the band of frequencies or wavelengths a laser can output, while linewidth usually refers to the full-width at half-maximum (FWHM) of the emitted light in the optical spectrum.
What is the difference between optical bandwidth and electrical bandwidth?
Optical Bandwidth = 100 MHz, Electrical Bandwidth = 70.7 MHz Formula for relation between fiber Optical Bandwidth and electrical bandwidth Electrical Bandwidth: It is defined as frequency at which ratio of current output with current input drops to value of 0.707.
What are the advantages of a fiber optic system?
Fiber optic systems are superior to metallic conductors in many applications. Their greatest advantage is bandwidth. Because of the wavelength of light, it is possible to transmit a signal that contains considerably more information than is possible with a metallic conductor — even a coaxial conductor.
How does a photodetector reduce the power of an optical signal?
So, if you have some bandwidth restriction in your optical path and it reduces the optical power by 3 dB, after passing through the photodetector the electrical signal power will be reduced by 6 dB.
How do environmental changes affect optical fibers?
Environmental changes affect the light intensity, phase and/or polarization in ways that can be detected at the other end of the fiber. • Power Delivery — Optical fibers can deliver remarkably high levels of power for tasks such as laser cutting, welding, marking, and drilling.