Fiber Optics Test
A multimode graded index fiber exhibits total pulse broadening of 0.2 µsec over a distance of 10Km. Estimate the maximum possible bandwidth assuming that there is no inter-symbol interference.
Avalanche photodiodes are ________.
COBRA (commutateur optique binaire rapide) is an ________.
Dark line defects (DLDs) occur when:
Dark spot defects (DSD's) occur in:
Dispersion in optical fibers causes distortion in _______.
Dispersion is low in the __________.
Dispersion is the lowest in a________.
FDDI can support a data rate of
FDDI is _______.
For a multimode optical graded index fiber, the profile parameter (α) will be equal to:
For a profile parameter (α)=1, the profile shape of refractive index for a graded index fiber will be _______.
For a step index fiber, relationship between numerical aperture (NA) and coupling efficiency (ηc) is ________.
For an ideal photo detector, the absorption coefficient must be ______.
Germanium avalanche photodiodes can be used for _______.
Germanium photodiodes are generally not preferred in the optical fiber system because of _________.
Graded-index fibers have:
Homodyne detection is used for _______.
Hydrogen absorption by optical fiber causes _______.
IEEE 802.5 is a/an ________.
In p-i-n photodiodes "i" stands for:
Index optical fibers are sometimes referred to as:
Intermodal dispersion is less in a __________.
Intersymbol interference (ISI) in optical fibers occurs due to ______.
LASER stands for:
LED is more suitable for analog transmission because of its _______.
Light emitting diodes (LED's) are:
Macro bending losses in optical fibers can be reduced by designing the fibers with ________.
Metallic impurities are eliminated from optical fiber by:
Mirrors are placed in LASER optical sources to maintain conditions for ________.
Near-field scanning method is used to measure:
Numerical aperture (NA) is related to the refractive indexes of core (n1) and cladding (n2) when,
One polarization maintaining fiber operates at a wavelength of 1.5 µm and has a beat length of 0.6mm. Its modal birefringence is given by _______.
Optical bandwidth (OB) relates to electrical bandwidth (EB) when
Optical time domain reflectometry (OTDR) is a/an ________.
Quantum efficiency (η) is defined as
Rayleigh scattering is a ________.
Refer to the figure above. The critical angle at the core cladding interface is given by:
Scattering losses happen due to:
Silicon reach through avalanche photodiodes has _______.
SOLITON is a/an ______.
SONET is _________.
Superluminescent LED's are preferred because of _______.
Surface emitter LEDs have high radiance because _______.
The cutback technique is a/an _______.
The fiber gyroscope is an ______.
The first generation optical fibers are fabricated from:
The information carrying capacity of optical fibers is in the range of:
The LASER is a/an
The Nd:YAG LASER is a/an_______.
The output power of a LASER is greater than that of a LED because of _____.
The population inversion phenomenon in optical sources occurs when _________.
The rays which travel in a helical path through an optical fiber are called ______.
The refractive index is defined as the ratio of ____________.
The vapor-phase deposition technique is used to produce _______.
Total internal reflection takes place at angles ________.
What does TPON stand for?
What happens when dispersion occurs?
What is signal attenuation in an optical fiber where P1=Input power and P0=Output power
What is the relationship between refractive index (n1) of core and refractive index (n2) of cladding for an optical fiber?
What is the thermal noise current it in a resistor R expressed in its mean square value? where, K is Boltzmann's constant, T is absolute temperature and B is the bandwidth
What would the optical return loss (ORL) be defined as when r-fresnal reflection occurs at a fiber-air interface?
When microwave frequency rather than radio frequency subcarriers are employed, the strategy is usually referred to as ______.
When optical power is incident on the photo detector during the 0 bit period, then the system is said to exhibit _______.
Which of the following is a characteristic of an injection LASER?
Which of the following is a fiber dispersion measurement method?
Which of the following is an Optical System Design Software?
Which one of the following is a type of non-linear scattering?
Which phenomenon does not let light rays escape an optical fiber?