I think the idea is that by varying say, two variables, independently so that each variable is optimized without correlation to the other is not as optimized as varying both at the same time and taking into consideration the correlation. For instance, you can consider walking on a triangular pyramid, where the line drawn from one corner of the triangular base to the center of the base is 45 degrees with both the x and y axis. The corner of the triangle to the top of the pyramid forms one of the edges of the pyramid. If you were to start near this edge but away from the top of the pyramid along the x direction, you would rise until you reach the edge. Similarly, if you were to walk back and forth along the y direction, you would rise until you reach the same point. However, were you to walk along the line y=x, you would walk directly up to the top of the pyramid, a point which is higher than the point you were previously at when you were walking along x and y independently. Unfortunately, the above analogy does not work for a square pyramid, because of the orthogonality of the x and y directions. However, you can choose two directions which are not at right angles with one another which the same idea holds. What is the result of such pyramids? I would say it is the orientations of the mirrors and the directions in which the fine knobs move the mirrors. Alternatively, you can take the surface to be an upside down pyramid, so that the value of the surface function represents the distance between the center of the fiber coupler and the point which the laser crosses on a hypothetical plane located at the fiber coupler and normal to the designed incident entrance direction.
In critical applications like coupling into a single mode fiber 2 mirrors are absolutely required. When coupling into a multimode fiber with core large enough, one mirror can be sufficient.
I hear human voices an was diagnosed with fibermyalger miss spelled.. These deceitful diseases caused by a idiot behind the scenes attacking my head an body... Sounds to me like it might be a oceanologist an math expert.. Gone wild... Put this on your facebook time line an sow a good seed to end human trafficking, radio active rf
