| 摘要 |
Conventional transformers for coupling a transmission line to a laser diode have an upper frequency limit of about 600 MHz. In order to extend bandwidth up to 860 MHz, an improved transformer features a first winding W1 and a second winding W2 twisted together and wrapped through apertures L1 and L2 of a double-aperture ferrite core DK. The twisting together of the windings suppresses stray inductances which would otherwise limit bandwidth. Preferably, a first grounding C1 is connected to the input terminal E and a second grounding capacitor C2 is connected to the output terminal O. Further, at the output terminal O, a laser diode LD is connected. The improved structure will perform anywhere within a bandwidth from 47 MHz up through 860 MHz.
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