Fig. 1. Experimental setup of CSMOV-based optical data links.

Fig. 2. Simulated intensity distribution of the SMOVs (a) with ℓ=41, 43, 47, 49 and (b) with ℓ=30, 60, 80, 100. (c) Theoretical intensity distribution of the SMOVs with ℓ=30, 60, 80, 100. The peaks around ρ1=2.50  mm refer to the sidelobe rings, the other 4 peaks (ρi=0.50, 0.95, 1.23, 1.53 mm) from left to right refer to the principle rings of the TC from 30 to 100, and the radii ratio is 0.20, 0.38, 0.49, 0.61, respectively. The curve labeled as “Total” in (c) shows the intensity distribution when four states of SMOV are used to form a CSMOV. Since each SMOV owns relatively equal total energy while the circumference of its principle ring increases with TC, the principle ring of the larger TC obtains a lower intensity.

Fig. 3. Bits in channels and their corresponding CCGH, CSMOV, and identified rings. For a given channel, the on/off of the SMOV with the corresponding TC represents 1/0 of information. (a1)–(e1) are the experimental results of CSMOVs carrying information on the top and (a2)–(e2) are the results after Hough transform.

Fig. 4. (a) Relative intensity distribution when the CSMOV channel with TC=80 is on/off; here, the measured radial position is 1.24 mm. (b) The theoretical and experimental results of cross talk of four CSMOV channels with TC=30, 60, 80, 100, respectively.

Table 1. Design Parameters of CSMOV for Each Annular Aperture