| 摘要 |
<p>An apparatus and method for modulating an optical signal. The two interferometer arms (521, 523) of a Mach-Zehnder interferometer section (540) are directly coupled to the dual input ports of a directional coupler switch section. Optical pulses transmitted through the interferometer arms are phase shifted in proportion to an analog signal applied (V(T)) at the electrical input port (570) of the Mach-Zender interferometer section. The phase-shifted pulses in each interferometer arm are coupled in the directional coupler switch section and are directed to the dual outpur ports of the directional switch section (540) based upon the binary code applied to the electrical input port (573) of the directional coupler switch section. The directional switch section (540) has an optical length designed to provide a net phase shift of 3 π/4.</p> |
