Photonic Integrated Circuit

Dear Colleagues,

I am pleased to invite you to contribute to this Special Issue on the topic of photonic integrated circuits (PICs). PICs are transforming the field of optics and photonics by providing multiple complex functionalities, which were previously confined to bulk optic or fiber components in a compact chip, such as light generation, isolation, stabilization, modulation, routing, filtering, detection, and quantum functionalities, as well as enabling new functionalities such a matrix multiplication for computation.

PICs have dense photonic functionalities, reducing size, weight and power requirements while enabling high-volume production by leveraging fabrication techniques developed in CMOS fabs. These are enabling high-capacity transceivers and interconnects to carry out high-speed and high-bandwidth datacenter communication. Moreover, the stagnation of Moore’s law and explosion of computing capacity requirements necessitate alternative computing approaches, and PIC-based analog or hybrid analog opto-electronic computing strategies can provide interesting pathways for future computation. PICs are also enabling low swap devices for sensing, spectroscopy, and metrology that will enable widespread, low-cost deployment and improved sensitivity. Nonlinear phenomena in waveguides are opening up new ways to generate and manipulate a wide range of wavelengths on chips in passive devices as well as introducing novel applications.

This Special Issue, entitled "Photonic Integrated Circuits", welcomes the contribution of original research and review papers that provide fundamental research, studies on innovative applications, interdisciplinary research, etc. The scope of this Special Issue includes, but is not limited to, the following topics:

• Exploring on-chip optical isolators, which are a crucial component for integrating lasers with other on-chip components and routing for integrated lasers.
• The investigation of different techniques for the heterogeneous integration of lasers.
• The investigating novel designs of Kerr frequency micro-combs, their integration with other optical on-chip components and their applications.
• Exploring integrated modulators for high-data-rate communication and novel applications.
• Novel optical designs providing on-chip stabilization for lasers.
• Exploring PICs and combined PICs with electronics for different specialized analog computing applications.
• Investigating PICs for generation, transmission and use of quantum states to achieve quantum communication and computing.
• PICs to enable interaction with atoms and ions towards providing compact systems for cold atom physics and scalable cold atom and trapped ion-based quantum computing.
• Exploring nonlinear phenomena for novel applications.
• The investigation and demonstration of high-sensitivity on-chip sensors.

I look forward to receiving your contributions.

Dr. Nitesh Chauhan
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

• photonic integrated circuit
• electro optic devices
• optical communications
• integrated devices
• frequency combs
• nonlinear optics
• photonic sensing