Hisao Go

Distortion-free Optical Fiber Amplifier for Analog Transmission Based on Hybrid Erbium-doped Fiber Configuration

In optical analog transmission systems, spectral gain tilt of a constituent erbium-doped fiber amplifier(EDFA) is known to degrade signal distortions in combination with laser chirping[1]. It has been suggested that the gain-tilt-induced signal distortions can be suppressed by reducing the EDF length [2] or inserting a tilt compensating filter [3] at the expense of an output power.

Low power consumption molded gigabit fiberoptic transceiver module

The standardization task of gigabit Ethernet by IEEE802.3z working group is attracting a great deal of attention. The demands for the modules compliant with the standardized specification will be increased. We have successfully developed gigabit fiberoptic transceiver modules compliant with 1000BASE-LX, proposed specification in gigabit Ethernet. The main feature of this module is 3.3 V operation which leads to low power consumption, while most of the conventional modules operate at 5.0 V. We used the newly designed package with lower profile 9.4 mm in height. The carefully designed modules package was formed by transfer mold encapsulation techniques which contribute to the cost reduction. In this paper, the design, assembling process, and characteristics of the developed module are described.