Short-pulse controlled optical switch using external cavity based single mode Fabry-Pérot laser diode

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.

Integrated photonic chips based on Sagnac interference

“…where the Sagnac interferometers perform as reflection mirrors similar to those in FP laser diodes [68,69]. In the MZI has the lowest quality (Q) factor (defined as the ratio of the resonance wavelength to the resonance 3-dB bandwidth).…”

Reflection Mirrors, Optical Gyroscopes, Filters, and Wavelength Interleavers Based on Sagnac Interference in Integrated Photonics

“…where the Sagnac interferometers perform as reflection mirrors similar to those in FP laser diodes [68,69]. In Figure 4, we compare the performance of a MZI, an add-drop RR (AD-RR), and a resonator formed by two cascaded Sagnac interferometers (2-CSIR).…”

All-optical majority gate based on an injection-locked laser

“…For instance, in telecommunications, the lasers have been used for enhancement of modulation bandwidth 21 , carrier phase recovery and regeneration 22 , phase-preserving amplitude limiting 23 , and orthogonal separation of amplitude and phase 24 . In the field of all-optical computing, the injection-locked gain-modulated lasers (later referred as the gain-modulation method ) have been used to demonstrate a number of logic gates (NOT 25–27 , NOR 25–28 , AND 26,28 , OR 26,28 , NAND 26,29–31 , XNOR 29 , XOR 28 ), switches 32–36 , a bit-error monitor 37 , a digital adder 29 , a comparator 38 , flip-flops 39–41 , and data packet header processing 33,34 .…”