By Cox III C.H.
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Extra resources for Analog optical links
Glass rods with a slightly different thermal expansion coefficient are one method of doing this, as shown in the right photograph of Fig. 9. The stress field makes the two polarization modes distinct, thereby ensuring that light launched into one of the polarization modes will stay in that mode – provided that the fiber is not subjected to external mechanical stresses sufficient to overcome the internal stress field. One easy way to impose external mechanical stresses is to bend the fiber. Typically, as a polarization maintaining fiber is bent, we see degradation of its polarization maintaining ability before we see significant degradation of its optical loss.
Also shown are reported slope efficiencies for several research and commercially available diode lasers. • VSCEl, FP, DFB. Point Authors and date Freq. (GHz) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 M. , 1993 Fujitsu, 1996 B. , 1994 T. , 1990 Y. , 1993 W. , 1990 T. , 1994 H. , 1992 T. , 1995 R. , 1992 L. , 1991 Y. , 1997 J. , 1994 S. 8 3 10 12 12 13 18 20 20 22 28 30 33 40 form of impedance matching between the modulation source and the laser to satisfy the definition of available power. A simple, but as we will see inefficient, way to implement the impedance match is to add a resistor, RMATCH , in series with the laser.
It is possible to derive this curve and the important features of it such as the threshold current and slope efficiency – which will be discussed below – from a coupled pair of differential equations that are known in the laser device field as the rate equations. However, this derivation does not add much insight for the link designer. Hence we choose to develop here the P vs. 1. As the current is increased from zero, initially the optical output is dominated by spontaneous emission and the output increases slowly with current.
Analog optical links by Cox III C.H.