Fiber-optic code division add-drop multiplexers

In this paper, we propose a new fiber-optic code division add-drop multiple xer (ADM) which not only possesses the inherent advantages of the fiber-opt ic code division multiple access (CDMA), but also is fully reconfigurable. Because incoherent optical signal processing is unipolar, the dropping proc ess is accomplished by adding the inversion of the received code. The propo sed ADM is applicable to both the bus and the ring topologies. The correspo nding system performance is calculated with the consideration of thermal no ise, shot noise, and the amplified spontaneous emission (ASE) noise of the optical amplifier. Many interesting and useful conclusions such as the subo ptimum value of various system parameters are presented.