Low-cost compact optical isolators

Details Low-cost compact optical isolators Low-cost compact optical isolators

1996-01-17

1998-09-15

Dzierzynski, Paul M.

Optical: systems and elements

Polarization without modulation

Polarization using a time invariant electric, magnetic, or...

359900, 372703, 385 27, 385 35, G02B 110

Patent

active

058087931

ABSTRACT:
An optical isolator unit is aligned, assembled, and subsequently diced into smaller isolator chips for placement in a micro-optical bench, along with input and an output fiber coupling ball lenses. Polarizers (for polarization-dependent isolators) or birefringence walkoff crystals (for polarization-independent isolators) are aligned and then glued together with 45.degree. Faraday rotators using an optical-grade adhesive. The surfaces of the components are AR-coated to match the index of the optical-grade adhesive. An optical isolator unit formed in this manner is then diced into a plurality of optical isolator chips with a high-speed wafer saw. The optical isolator unit is preferably mounted on any one of its sides in such a way that only a smallest possible cutting depth is required for dicing, i.e., it is mounted such that a thinnest dimension of the isolator is presented for cutting, such that material loss due to cutting is reduced and delamination of the optical isolator chips is prevented.

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Chang et al., "Polarization Independent Isolator Using Spatial Walkoff Polarizers," IEEE Photonics Technology Letters, vol. 1, No. 3, Mar. 1989.
Chang et al., "High-performance single-mode fiber polarization-independent isolators," Optics Letters, vol. 15, No. 8, Apr. 15, 1990.

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