High precision N-bit dimmable delay
A technology of optical delay and delay device, which is applied in the direction of light guide, optics, instruments, etc., can solve the problems of small number of bits of delay device, large transmission loss of waveguide light, and high sensitivity of chip process, and achieves improvement of delay accuracy, The effect of improved delay step size and strong process feasibility
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[0028] The present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings:
[0029] The invention proposes a novel adjustable optical delay device of "optical switch + free space optical delay", which adopts a binary topology structure. like figure 1 As shown, the optical delay unit at each level has two delay channels, and the difference between the two delay lengths is ΔL, 2ΔL, 4ΔL... 2 n-1 ΔL, where n is the bit number of the delayer, and ΔL is the tuning step size of the delayer. The 1st and N+1th optical switches in the figure can also be replaced by 2×2 optical switches.
[0030] figure 2 A schematic structural diagram of an example of a 9-bit optical delay device disclosed in the present invention is given. In the figure, 1 is an optical switch chip, which consists of 10 2×2 optical switch arrays, 2 is a collimating lens array, 3 is a mirror, 4 is a mirror base platform, and 5 is an input / output fi...
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