Demonstration of single mode fiber holographic interconnect with reconfigurable photothermoplastic holograms

Philippe Gravey; Leon Bonnel

doi:10.1117/12.206211

12 April 1995 Demonstration of single mode fiber holographic interconnect with reconfigurable photothermoplastic holograms

Philippe Gravey, Leon Bonnel

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Proceedings Volume 2406, Practical Holography IX; (1995) https://doi.org/10.1117/12.206211
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1995, San Jose, CA, United States

Abstract

An experimental 16 to 16 single mode fiber interconnect is being implemented. The switch structure involves the deflection of the incoming channels by two successive photothermoplastic holograms situated among two linear arrays of sixteen 650 by 650 micrometers holograms, with a 750 micrometers spacing. A reconfiguration time shorter than 10 ms for one couple of interconnection holograms has been demonstrated, with a diffraction efficiency exceeding 20% at a readout wavelength of 1.32 micrometers . Linear fiber and microlens arrays are required to perform a global collimation of all incoming and outgoing beams. We have interconnected two 16 fiber arrays situated at a distance of 12 cm (compatible with the holographic switch design) with 8 dB connection losses by using arrays of refractive microlenses of 2.9 mm focal length. Thus, in the final system the overall losses can be kept lower than 25 dB, which is compatible with optical amplification. An optical addressing system has been designed for the reconfiguration of the holograms. It involves two bi- dimensional deflection subsystems. The first one is based on two acousto-optic deflectors and performs the control of the grating period; the second one involves to moving mirrors and allows to select what hologram is to be exposed. The global reconfiguration time (for the 32 holograms) is expected to be lower than 100 ms.

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Philippe Gravey and Leon Bonnel "Demonstration of single mode fiber holographic interconnect with reconfigurable photothermoplastic holograms", Proc. SPIE 2406, Practical Holography IX, (12 April 1995); https://doi.org/10.1117/12.206211

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KEYWORDS

Holograms

Holography

Diffraction

Microlens array

Collimation

Optical design

Switching

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