MODULATION OF SEMICONDUCTOR LASER

摘要: PURPOSE:To obtain a uniform light outpvut regardless to the bit pattern of signal by method werein semiconductor laser is driven current obtained superposition DC offset current, bias which varies periodically and synchronized with current. CONSTITUTION:A 5 1s ID Io, Ib Is currcnt Ib. For instance, transmitted coded an encoder 1 ia voltage-current converter 4. On other hand, synchronizing delgyed delay circuit 2 converted 3 be applied as periodical Those two currents Ia are supplied 5. The lo directly injected into With this constitution, residual carrier density each end can kept constant so that output signal.