Patent ID: 7515832
Filing Date: 2009-04-07
Classification: H04B,H04L

Abstract:
1. Optical transmission equipment comprising: an optical modulation unit including a plurality of optical modulators coupled to an internal optical transmission path; and an electric circuit unit for generating a plurality of high-speed serial digital signal streams to be supplied to said optical modulation unit, wherein said electric circuit unit includes: a plurality of parallel signal paths each for transferring an N-bit-parallel low-speed digital signal stream (N is an integer more than 1); a plurality of multiplexing circuits each for converting the N-bit-parallel low-speed digital signal stream received from one of said parallel signal paths into a high-speed serial digital signal stream to be supplied to said optical modulation unit; and a delay control buffer circuit inserted in at least one of said parallel signal paths to receive the N-bit-parallel low-speed digital signal stream, wherein said delay control buffer circuit performs delay adjustment on the N-bit-parallel low-speed received digital signal stream, with a timing unit of a bit period of the high-speed serial digital signal stream or with the timing unit corresponding to an integral fraction of the bit period and outputs the resultant digital signal stream to the parallel signal path.