G - Physics – 02 – F
Patent
G - Physics
02
F
G02F 1/21 (2006.01) G02F 1/015 (2006.01) G02F 3/02 (2006.01)
Patent
CA 2082939
An asymetric Fabry-Perot (FP) modulator includes a quan- tum well structure having wider (approximately 150.ANG.) than usual (about 100.ANG.) wells. The FP cavity has a resonance at a wave- length of an excitonic absorption peak of the QW structure. Al- though the maximum change in absorption under applied bias is less with 150° wells than with 100° wells, the characteristics of the electroabsorption are also altered, with the result that the lar- gest change occurs at the wavelength of the band-edge el-hhl ex- citon at zero bias. Absorption can be reduced by biasing the QW and hence the AFPM can have a normally-off (zero bias, zero ref- lectivity) characteristic. Such an arrangement makes possible higher contrast modulation and/or lower operating voltages. The FP modulator may be used in SEEDs.
Gowling Lafleur Henderson Llp
Ipg Photonics Corporation
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