Optical: systems and elements – Optical amplifier – Particular active medium
Patent
1998-02-24
2000-04-04
Hellner, Mark
Optical: systems and elements
Optical amplifier
Particular active medium
385 33, H01S 0300, G02B 632
Patent
active
060468424
ABSTRACT:
The invention relates to an optoelectronic device (1) with a laser amplifier (3) at one side of which are present in the radiation path in that order: a lens (8), a polarization-changing element (17), and a mirror (9) which together with the element (17) forms an orthogonal reflector. Both the radiation to be amplified and the amplified radiation issue from the device at the other side of the amplifier (3). Such a device (1) has a very low sensitivity to the polarization of the radiation to be amplified and is particularly suitable for use at very high bit rates.
A disadvantage of the known device is that its efficiency is not particularly high and not well reproducible.
According to the invention, the lens (8) comprises a magnifying lens (8), and the mirror (9) is present substantially in the image plane of the magnifying lens (8). As a result, the alignment of the amplifier (3) with respect to the lens (8) is much less critical, so that the efficiency is higher and more reproducible. The device is thus not only more suitable for the application mentioned above, but can also be manufactured in a comparatively simple manner. The positioning of the mirror (9) can be used on the one hand for correcting any inaccuracy in the alignment of the amplifier (3) with respect to the magnifying lens (8). Positioning of the mirror (9) is in addition simple, because it is limited to the direction of the radiation path. The angle enclosed by the mirror (9) and the radiation path has substantially no influence on the performance. Preferably, the amplifier (3) itself is already substantially insensitive to polarization. The device (1) according to the invention can thus have a particularly low polarization sensitivity.
REFERENCES:
patent: 4941738 (1990-07-01), Olsson
patent: 5089786 (1992-02-01), Tamura
patent: 5396365 (1995-03-01), Gustavsson
patent: 5712940 (1998-01-01), Van Roemburg et al.
"Polarization-Independent Configuration Optical Amplifier" By N.A. Olsson, Electronic Letters, Aug. 18, 1998, vol. 24, No. 17, pp. 1075-1076.
Glenn Michael A.
Hellner Mark
JDS Uniphase
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