All-optical frequency-encoded inversion operation with tristate logic using reflecting semiconductor optical amplifiers

A novel all optical method of implementing an n-bit wavelength encoded complete digital data comparator using nonlinear semiconductor optical amplifiers

“…This is due to our encoding technique in which the different binary logics are coded by the different wavelengths of the signal rather than the intensity labels. Our system will also enjoy the potential advantages of the wavelength encoding technique over the other encoding mechanisms [11,14]. To maintain the state of polarization (SOP) of the input data signals, polarization controllers are to be used in appropriate positions.…”

“…But these coding processes have some inherent problems. To avoid those problems very recently frequency encoding scheme has been established very efficiently [11][12][13][14][15][16]. The prime beauty of the scheme is that as frequency is the fundamental property of the wave so it can preserve its identity irrespective of the absorption, reflection, transmission during its propagation through different systems as well as communicating media.…”

An alternative approach of developing a frequency encoded optical tri-state multiplexer with broad area semiconductor optical amplifier (BSOA)

“…Here A and B are the control input signals, which are sent through the two ADMs (ADM1 and ADM2, respectively). The ADMs drop the 3 different frequencies in 3 different directions and each of them separately appears as either a pump or a signal beam at the input of the different broad area SOAs [marked by [1][2][3][4][5][6][7][8][9] (1,2,3,4,5,6,7,8,9), respectively. This is shown in Fig.…”

“…Many optical gates, digital optical devices like multiplexer and demultiplexer logic systems, etc. are already proposed using semiconductor optical amplifier SOA as a optical switch [1][2][3][4][5] used in several gain modes like XGM, XPol, and wavelength conversion. Broad area SOA has the special advantage to separate a converted signal frequency from the frequencies of pump and input data signals.…”

Method of implementation of all-optical frequency encoded logic operations exploiting the propagation characters of light through semiconductor optical amplifiers

“…It is known that if '1' and '0' logic states are encoded by two different frequencies then one can ensure the states of a signal during transmission. That is if '0' state is encoded by a frequency 'v 1 ' and the '1' by 'v 2 ' then 'v 1 ' and 'v 2 ' will remain unaltered throughout the transmission of data, whether it suffer from reflection, attenuation loss or refraction [8,9,12].…”