A Novel Variable-Length Header Extraction Scheme Based on Ring Laser for All-Optical Packet Switching Network

In this paper, a novel header extraction scheme based on semiconductor ring laser is proposed and simulated for proof of principle. This scheme is to be used in all-optical packet switching network which can extract return-to-zero (RZ) format modulation data packet with variable header/payload length and intensive spacing. Simulations and numerical analysis for a 3-byte header and 128-byte payload show that this structure can extract the headers with more than 20 dB contrast ratio. Additionally, the structure simplicity and its small size is proper candida to integration in all-optical circuits.

Одночастотные кольцевые полупроводниковые лазеры с волоконным резонатором

Представлены результаты исследований перестраиваемых одночастотных кольцевых полупроводниковых лазеров на длине волны 1 550 и 1 650 нм с волоконным резонатором. Изложены принципы конструирования кольцевых полупроводниковых лазеров с волоконным резонатором с сохранением поляризации и без сохранения поляризации. Обоснован одночастотный режим работы и перестройки длины волны полупроводникового кольцевого лазера. Обсуждаются основные характеристики полупроводниковых кольцевых лазеров и области их применения. The results of studies of tunable single-­frequency ring semiconductor lasers at a wavelength of 1550 and 1650 nm with a fiber cavity are presented. The principles of designing ring semiconductor lasers with a fiber cavity with conservation of polarization and without conservation of polarization are stated. The single-­frequency operation and tuning of the wavelength of a semiconductor ring laser is substantiated. The main characteristics of semiconductor ring lasers and their applications are discussed.

Optical Feedback Sensitivity of a Semiconductor Ring Laser with Tunable Directionality

We discuss the sensitivity to optical feedback of a semiconductor ring laser that is made to emit in a single-longitudinal mode by applying on-chip filtered optical feedback in one of the directional modes. The device is fabricated on a generic photonics integration platform using standard components. By varying the filtered feedback strength, we can tune the wavelength and directionality of the laser. Beside this, filtered optical feedback results in a limited reduction of the sensitivity for optical feedback from an off-chip optical reflection when the laser is operating in the unidirectional regime.

Properties of Phase Solitons in an Optically Driven Semiconductor Ring Laser

A semiconductor ring laser with a long cavity supports propagating localised structures with a chiral charge, named phase solitons. In this paper we study the dependence of the velocity and of the duration of the phase solitons on the characteristic time scales of the laser, namely the photon lifetime and the carrier lifetime. We show numerically that phase solitons are stable over a large range of those parameters and verify that the propagation velocity decreases linearly with the ratio of the carrier lifetime to the photon lifetime, while the duration is proportional to the ratio of the carrier lifetime to the cavity roundtrip time.

Recognition of the optical packet header for two channels utilizing the parallel reservoir computing based on a semiconductor ring laser

In this paper, an all-optical parallel reservoir computing (RC) system with two channels for the optical packet header recognition is proposed and simulated, which is based on a semiconductor ring laser (SRL) with the characteristic of bidirectional light paths. The parallel optical loops are built through the cross-feedback of the bidirectional light paths where every optical loop can independently recognize each injected optical packet header. Two input signals are mapped and recognized simultaneously by training all-optical parallel reservoir, which is attributed to the nonlinear states in the laser. The recognition of optical packet headers for two channels from 4 bits to 32 bits is implemented through the simulation optimizing system parameters and therefore, the optimal recognition error ratio is 0. Since this structure can combine with the wavelength division multiplexing (WDM) optical packet switching network, the wavelength of each channel of optical packet headers for recognition can be different, and a better recognition result can be obtained.