Abstract:
The optical communication is of great interest in developing extensive, highspeed
networking infrastructures. Optical fibers provide many advantages over
traditional copper cables and wireless links. Among these advantages are high
security, low electromagnetic interference, extremely low loss, very high ban dwidths,
and highly manageable cabling. However, the very small wavelengths associated with
optical radiation require very small waveguide dimensions. Waveguide dimension of
single mode fiber (SMF) are < 10um, resulting in relatively poor yield in device
manufacturing. For most of the last-mile networks topologies, cost constraints limit
the appeal of SMF. Large core fibers allow for less restrictive manufacturing
tolerances; however, they also results in multi mode propagation that exhibit distortion
from the dispersion in propagation among the many modes. The distortion can be
prohibitively large for data rates approaching and exceeding i Gb/s.//
Improvement of the de ployability of these multi mode fibers depends on the
proper design of the multi mode fiber link parameters for the reduction of the over
estimation. Conventional multi mode fiber model ignores all the effects of the different
laser mode profiles in the link simulation and over estimates the penalty. Proposed
modified model for vertical cavity surface emitting laser (VCSEL) based mult imode
fiber (MMF) links considers all effects of different laser mode profiles and compare
the transmitted eye diagrams and Q- Factors with the conventional model.//
Significant differences observed in the eye diagrams and the Q- factors of the
modified model compared to the conventional model with various kinds of graded
index mult imode fibers and VCSEL. 29 % of Q- factor improvement observed in laser
optimized MMF link with rate of 10 Gb/s and distance of 300 m.
