Abstract-A novel all-optical 2R regenerator based on a multimode interference coupler (MMI) semiconductor optical amplifier is presented. Static measurements of the transfer function reveal a digital transfer characteristic and a high increase in extinction ratio. The experiments are in good agreement with simulations, which have been done using a modified beam propagation method program. The device has a high tolerance to the MMI length. It has been fabricated in an all-active layout, avoiding the need for active/passive integration and is very compact.
Abstract:Here we propose novel active multi-mode-interferometer (MMI) laser diodes (LDs) for 14XX nm fiber amplifier pump applications. The waveguide of the LDs is consisted from 1x1-MMI couplers integrated with 1 st order-mode permitted waveguides to enhance the total active area. Although there is no single-mode waveguide region inside the cavity, the novel active MMI-LDs emitted in stable singletransverse-mode output up to maximum output power. Moreover, they achieved high output power of 1.46 W, and low driving voltage of only 1.75 V at 1 W output power.
In this chapter the different means for all鈥恛ptical signal regeneration are outlined. 3R regeneration implies signal reshaping and retiming and is based on optical decision circuits and devices for optical clock extraction respectively. In what follows, it will become clear that most of the optical decision circuits are based on active interferometers while devices for clock recovery are generally self鈥恜ulsating laser diodes.
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