Optical waveguides – Polarization without modulation
Patent
1995-06-07
1996-07-23
Healy, Brian
Optical waveguides
Polarization without modulation
385 14, 385 27, 385 28, 385 31, 385131, 385132, 359192, 359195, 437 51, 437225, G02B 610, H01L 2170
Patent
active
055398456
ABSTRACT:
Integrated optical polarization converter provided with a channel-type waveguide (B) defined by a strip-type structure (S.sub.4) supported by a substrate (S) and having a periodic concatenation of two different part strips having side walls which are at different angles with the plane of the substrate. The two part strips have as cross-sections either a trapezium (EFGH with .DELTA..sub.1, .DELTA..sub.2 .noteq.0) and a rectangle (EFGH with .DELTA..sub.1 =.DELTA..sub.2 =0), or both of them a right-angled trapezium with oblique sides situated opposite one another (EFGH with .DELTA..sub.1 0 and .DELTA..sub.2 .noteq.0, and EFGH with .DELTA..sub.1 .noteq.0 and .DELTA..sub.2 =0). Oblique and vertical side walls on such a strip-type structure supported by a substrate are fabricated, in the case of suitable crystal orientation, by means of two mutually complementary mask patterns, using etching steps, employing wet-chemical and dry etchants respectively.
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Healy Brian
Koninklijke PTT Nederland N.V.
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