Optical apparatus

1. An optical system comprising:

a plurality of internal apertures operable to receive a plurality of aperture-specific optical signals, wherein each internal aperture is operable to receive a corresponding aperture-specific optical signal of the plurality of aperture-specific optical signals;

a plurality of external optical assemblies, wherein each external optical assembly corresponds to one of the internal apertures, and each external optical assembly is operable to direct the corresponding aperture-specific optical signal of the corresponding internal aperture in a corresponding external direction, wherein the external direction for each external optical assembly is independently controllable; and

a telescope assembly positioned between the plurality of internal apertures and the plurality of external optical assemblies, wherein the telescope assembly defines a single shared optical train arranged to direct the plurality of aperture-specific optical signals between the plurality of internal apertures and the plurality of external optical assemblies, wherein the shared optical train is arranged to direct the aperture-specific optical signals between each internal aperture and the corresponding external optical assembly, wherein the shared optical train includes a plurality of individual optical elements arranged into an optical sequence whereby each aperture-specific optical signal is directed to each optical element in the plurality of individual optical elements in the optical sequence as that aperture-specific optical signal travels between the corresponding internal aperture and corresponding external optical assembly.

2. The optical system of claim 1 , wherein the telescope assembly defines a central telescope axis, and the optical train is rotationally symmetric about the central telescope axis.

3. The optical system of claim 1 , wherein the optical train comprises a plurality of optical elements, and the plurality of optical elements are concentric.

4. The optical system of claim 1 , wherein the optical train comprises a plurality of mirrors, wherein the plurality of mirrors are concentric.

5. The optical system of claim 1 , wherein the optical train comprises a plurality of lenses, wherein the plurality of lenses are concentric.

6. The optical system of claim 1 , wherein the optical train comprises a plurality of mirrors, wherein each mirror is rotationally symmetric.

7. The optical system of claim 1 , wherein the optical train comprises a plurality of lenses, wherein each lens is rotationally symmetric.

8. The optical system of claim 1 , wherein the optical train comprises at least one lens and at least one mirror wherein the at least one lens and the at least one mirror are concentric.

9. The optical system of claim 1 , wherein the optical train comprises at least one lens and at least one mirror wherein each lens and each mirror is rotationally symmetric.

10. The optical system of claim 1 , wherein:

the telescope assembly defines a telescope field of view; and

each external direction has an angular separation from each and every other external direction that is controllable to an angular separation range greater than the telescope field of view.

11. The optical system of claim 1 , wherein each external optical assembly comprises an adjustable beam deflector operable to direct the corresponding aperture-specific optical signal through a corresponding external communication terminal in the corresponding external direction.

12. The optical system of claim 11 , wherein the beam deflector comprises a coarse pointing assembly.

13. The optical system of claim 1 wherein the optical system is an optical laser communication system.

14. The optical system of claim 1 wherein the telescope assembly includes a single primary mirror and a single secondary mirror.

15. An optical system comprising:

a plurality of internal apertures, wherein each internal aperture is operable to receive a corresponding aperture-specific optical signal;

a plurality of external optical assemblies, wherein each external optical assembly corresponds to one of the internal apertures, and each external optical assembly is operable to direct the aperture-specific optical signal of the corresponding internal aperture in a corresponding external direction, wherein the external direction for each external optical assembly is independently controllable; and

a telescope assembly positioned between the plurality of internal apertures and the plurality of external optical assemblies, wherein the telescope assembly defines a shared optical train arranged to direct the aperture-specific optical signals between each internal aperture and the corresponding external optical assembly, wherein

the shared optical train comprises a single concave parabolic mirror, and each external optical assembly comprises an input sub-aperture arranged facing the single concave parabolic mirror whereby each corresponding aperture-specific optical signal is reflected by the single concave parabolic mirror.

16. The optical system of claim 15 , wherein the telescope assembly defines a central telescope axis, and the parabolic mirror is concentric with the central telescope axis and the parabolic mirror is rotationally symmetric about the central telescope axis.

17. The optical system of claim 15 wherein the telescope assembly includes a single primary mirror and a single secondary mirror.

18. An optical system comprising:

a plurality of internal apertures operable to receive a plurality of aperture-specific optical signals, wherein each internal aperture is operable to receive a corresponding aperture-specific optical signal;

a plurality of external optical assemblies, wherein each external optical assembly corresponds to one of the internal apertures, and each external optical assembly is operable to direct the aperture-specific optical signal of the corresponding internal aperture in a corresponding external direction, wherein each external optical assembly is operable to adjust the external direction along which the aperture-specific optical signal of the corresponding internal aperture is directed, and each external optical assembly is independently controllable to adjust the corresponding external direction; and

a telescope assembly positioned between the plurality of internal apertures and the plurality of external optical assemblies, wherein the telescope assembly defines a shared optical train arranged to direct the plurality of aperture-specific optical signals between the plurality of internal apertures and the plurality of external optical assemblies, wherein the shared optical train is arranged to direct the aperture-specific optical signals between each internal aperture and the corresponding external optical assembly.

19. The optical system of claim 18 wherein:

the telescope assembly defines a telescope field of view; and

each external optical assembly is adjustable to direct the aperture-specific optical signal of the corresponding internal aperture through a range of potential external directions, wherein the range of potential external directions includes external directions with an angular separation from each and every other external direction of every other external optical assembly that is greater than the telescope field of view.

20. The optical system of claim 18 wherein the telescope assembly includes a single primary mirror and a single secondary mirror.