| 摘要 |
A beam-splitter 54 receives an input light beam 52 which is split down two or more waveguides 56 58 that each direct a split beam to photodetectors 62 64 connected via amplifiers 66 68 to a signal processor 70 that determines the input beam wavelength based on the photodetector outputs. The beam splitter 54, waveguides 56 58, amplifiers 66 68 and photodetectors 62 64 may all be fabricated on the same silicon chip 50 using integrated optics for the beam-splitter and waveguides. At least one of the waveguides also comprises a periodic transmission- wavelength function modulation section 60. If three sets of waveguides and photodetectors are present then two of the waveguides may have modulation sections that have different operating frequencies. The modulation section is substantially based on interference effects and may comprise Fabry-Perot cavity or Mach-Zender interferometer devices (see figures 2 to 6). |
