Abstract
We propose and demonstrate a novel scheme for short pulse controlled all-optical switch using external cavity based single mode Fabry- Pérot laser diode (SMFP-LD). The proposed scheme consists of control unit and switching unit as two essential blocks. The basic principle of the proposed scheme is the optical bistability property of SMFP-LD for the control unit and the suppression of the dominant beam of SMFP-LD with injection locking for the switching unit. We also present the analysis of hysteresis width and rising/falling time with change in wavelength detuning which helps to find the optimum wavelength detuning value and power of light beams at different stages of the proposed scheme that gives wide input dynamic power range, high ON/OFF contrast ratio, and low rising/falling time. Input data of 10 Gb/s Non Return to Zero (NRZ) signal is switched at output ports depending upon the control signal generated by the control unit, which comprises of optical SR latch. Output waveforms, clear eye diagrams with extinction ratio of about 11 dB, rising/falling time of about 30 ps and 40 ps, and bit error rate (BER) are measured to validate proposed scheme. No noise floor is observed at output ports up to BER of 10-(12) and the maximum power penalty recorded is about 1.7 dB at a BER of 10-(9) which shows good performance of the proposed short pulse controlled optical switch using SMFP-LDs.
Highlights
Optical signal processing and controlling has received considerable attention since it addresses various challenges such as information acquisition, transmission, storage and processing, and meets the demands of high speed and large capacity requirement of optical communication system
We have proposed and demonstrated a novel approach of short pulse controlled optical switch using self-injected single mode Fabry-Pérot laser diode along with the analysis of wavelength detuning effect on hysteresis width and rising/falling time of single mode FabryPérot laser diode (SMFP-LD)
The analysis provides the information for choosing the wavelength detuning and the optimal power for the different beams to be used in the proposed idea
Summary
Optical signal processing and controlling has received considerable attention since it addresses various challenges such as information acquisition, transmission, storage and processing, and meets the demands of high speed and large capacity requirement of optical communication system. All-optical technology shows promising applications in the field of fast signal processing, higher accuracy sensing, control system in hazardous situations, and electromagnetic interference free system One of these scenario is represented by optical interconnection between chip to chip used for short range photonics interconnection to improve the high performance computing [3]. To overcome the higher cost and high driving current requirements, optical units such as gates and switches have been proposed using commercially available multi-mode Fabry-Pérot laser diodes (MMFP-LD) [16,17,18] and especially designed single mode Fabry-Pérot laser diodes [19,20,21] All these techniques require input control signal to be high for the entire period of data to be blocked at the output ports. Eye diagrams with extinction ratio of more than 11 dB, rising/falling time of about 30/40 ps and no noise floor up to BER of 10−12 are obtained at output ports
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