Wavelength Division Multiaccess Network Using Component Centralization, Local Oscillator Injection Locking and Homodyne Detection
Original Publication Date: 1988-Feb-01
Included in the Prior Art Database: 2005-Feb-14
In a centralized wavelength division multiaccess network, local reference copies of unmodulated carries are available. This invention takes advantage of this availability by locking the local oscillator using homodyne coherent reception, thereby improving detectability and reducing circuit complexity. BACKGROUND Fig. 1 shows the typical wavelength division multiaccess (WDMA) network using a fully decentralized architecture. Each transmitter sends on a different wavelength, and (under the command of the controller), each receiver receives the desired transmission by tuning to the right wavelength in the local tunable optical filter just prior to photodetection. The star coupler serves the function of merging and then broadcasting all the transmissions. (Image Omitted) Fig.