16-19, May 2022.Īll rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. A Faraday Isolator is an optical device that provides high transmission of signal light in the forward direction, but strongly blocks. This value is ~1/4 that with the circuit using a conventional mirror (~0.45 dB).Īutomatic gain-control / Semiconductor optical amplifier / Polarization-independent / / / / / Two typical configurations are 1) an optical Master Oscillator Power Amplifier (MOPA) scheme for ps pulses and often with hybrid bulk-fiber design, and 2) a Chirped Pulse Amplifier (CPA) scheme for fs pulses. The polarization dependence of the gain is ~0.12 dB with the circuit using an FRM. It was clarified that the polarization dependence of the gain is decreased with the double-pass type AGC circuit using a circulator and a Faraday rotator mirror. The characteristics that one looks for in a Faraday rotator optic include a high Verdet constant, low absorption coefficient, low non-linear refractive index and high damage threshold. In this paper, the gain control characteristics of a polarization independent configuration of all-optical FF-AGC circuit using a semiconductor optical amplifier are experimentally studied. The most important optical element in an isolator is the Faraday rotator. Kokoro Kitamura ( Shimane Univ.) OFT2022-4Īn all-optical feedforward automatic gain control scheme is applicable to a multicore erbium-doped amplifier. Gain Control Characteristics of a Polarization-Independent Configuration Using a Circulator and a Faraday Rotator Mirror in All-Optical Feedforward Automatic Gain Control Scheme The investigation of Faraday isolators based on NTF crystals cut in 001 and C orientations demonstrated a significant advantage of the critical orientation. Please also see the related technology T-003887.Ken-system: Gain Control Characteristics of a Polarization-Independent Configuration Using a Circulator and a Faraday Rotator Mirror in All-Optical Feedforward Automatic Gain Control Scheme IEICE Technical Committee Submission System The C orientation is determined by the parameter therefore, its accurate measurement is of particular importance. The configuration of the magneto-optical medium distribution can also be optimized to the desired mode profile. achieved by inserting in the loop a system analogous to a Faraday isolator. The resulting optical isolator is compact and exhibits high reverse isolation in the bandwidth between the lowest forward- and backward- cutoff frequencies of the waveguide. This photodetection feedback scheme has been adapted also to the experiment. The scheme of rejecting reverse-propagating waves is based on a direction-dependent waveguide cut-off frequency. Technologyĭuke researchers have designed a novel optical isolator constructed on a single-mode waveguide that uses magneto-optic materials to create a non-homogenous waveguide cross-section. Disadvantageously, such a temperature compensation scheme not only adds to. Therefore there is a need for an improved single-waveguide optical polarizer design that is compatible with integrated nanoscale optical circuitry. To eliminate such noise, an optical isolator, as described for instance in. This optical isolator does not require polarizers, but instead uses high-precision interference for blocking back-propagating light involving two long waveguides hosting reciprocal and non-reciprocal phase shifters. In order to construct guided-wave optical isolators, an asymmetric Mach-Zehnder waveguide interferometer is commonly used. It is also a challenge to build Faraday rotator-type isolator components in guided-optics format, i.e. Because of the size of the Faraday rotator, this type of optical isolator is relatively large.
Conventional optical isolators are based on a Faraday rotator sandwiched between two polarizers. They are used to avoid unwanted back-propagation of light, for example, to avoid destabilization of semiconductor lasers caused by reflected light coming back into the laser cavity. Optical isolators are devices that transmit light in only one direction. Optical isolators are critically important in many applications in optical systems. On-chip waveguide optical isolator Unmet Need
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