Accession Number : ADP007029

Title :   Amplified Integrated Star Couplers with Zero Loss,

Corporate Author : AT AND T BELL LABS HOLMDEL NJ

Personal Author(s) : Presby, Herman M. ; Giles, C. R.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Passive star couplers play a central role in the architecture of many high-speed, multiple-access optical networks. Although the use of a star coupler is possible under ideal conditions for networks with a large number of users, in practice, the size of the system is limited by the inherent 1/N splitting and excess loss of the coupler, the limited sensitivity of the receiver, and the finite available source power. A way to increase the number of users in a star network is with the use of erbium-doped fiber (EDF) amplifiers to compensate, at least to some degree, for the splitting and excess loss of the stain. Full compensation for the loss of large stars can be achieved by incorporating an EDF amplifier in each output port to amplify the signal. With such an arrangement, however, each output port requires its own EDF and associated pump laser and pump/signal combiner at a cost which can be prohibitive. Recently, an economical means of simultaneously pumping EDF'S, placed at the input or output ports of the coupler, with a single laser source distributed through the star coupler itself was proposed. In this way, many amplifiers can share the cost of a single pump laser and with the star acting as the pump/signal combiner, the need for a large number of these components is eliminated as well.

Descriptors :   *AMPLIFIERS, *COUPLERS, *OPTICAL EQUIPMENT, ACCESS, ARCHITECTURE, COMPENSATION, COSTS, ERBIUM, FIBERS, INPUT, LASERS, MULTIPLE ACCESS, NETWORKS, NUMBERS, OUTPUT, POWER, PUMPING, PUMPS, RECEIVERS, RECREATION, SENSITIVITY, SIGNALS, SPLITTING, STARS, VELOCITY, ERBIUM.

Subject Categories : Electrical and Electronic Equipment
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE