All-optical AND gate with improved extinction ratio using signal induced nonlinearities in a bulk semiconductor optical amplifier

Abstract

An all-optical AND gate based on optically induced nonlinear polarization rotation of a probe light in a bulk semiconductor optical amplifier is realized at a bit rate of 2.5Gbit/s. By operating the AND gate in an up and inverted wavelength conversion scheme, the extinction ratio is improved by 8dB compared with previously published work.

A method of developing frequency encoded multi-bit optical data comparator using semiconductor optical amplifier

“…The principle of frequency routing by SOA based add/drop multiplexer has already been explained in our earlier works [18,-20] and the work by Raybon et al [21]. The principle of frequency conversion based on nonlinear state of polarization rotation of the probe beam in SOA has also been well explained in our previous works [20,22], the works by Guo and Connelly [23,24] and the work by Liu [24]. In addition to the above mentioned two principles, to implement a multibit comparator unit, single bit comparator units are to be coupled via 'MZI-SOA' interferometric switches in which (iii) MZI-SOA interferometers are acting as a two output ports (bar and cross ports) optical switch.…”

“…Thus both the input pump beam is injected at 'S 1 ' whereas other SOAs get at most one pump beam. Therefore, both the pump beams of 'S 1 ' can significantly rotate the state of polarization of input data beam 'X 1 ' injected at the 'port-1' and an optical polarizer at the output end can detect the nonlinear polarization rotation in terms of intensity difference [20,22,24]. As a result, 'S 1 ' will give filtered 'X 1 ' beam of frequency 'n S ' at the output end (Y) via the port 1 0 , after passing through filter and polarizer placed successively at the end of SOA denoted as 'S 1 '.…”

Characterization of the semiconductor optical amplifier for amplification and photonic switching employing the segmentation model

“…Therefore, the carrier density will be reduced thus causing a drop in the SOA gain. The carrier non-equilibrium is governed mainly by the spectral hole burning effect [13,14]. The distribution recovers to the equilibrium by the carrier-carrier scattering.…”

Impact of signalwavelength on the semiconductor opticalamplifier gain uniformity for high speed optical routers employing the segmentation model

“…After the departure of the incident beam from the waveguide, the carrier density recovers by means of series of effects that will take place, namely, carrier-carrier scattering [6], two-photon absorption, the optical Kerr effects and quasi-equilibrium distribution [7].…”