Elements Of Photonics, For Fiber And Integrated...
The arrayed waveguide grating (AWG) which are commonly used as optical (de)multiplexers in wavelength division multiplexed (WDM) fiber-optic communication systems are an example of a photonic integrated circuit which has replaced previous multiplexing schemes which utilized multiple discrete filter elements. Since separating optical modes is a need for quantum computing, this technology may be helpful to miniaturize quantum computers (see linear optical quantum computing).
Elements of Photonics, For Fiber and Integrated...
With semiconductor technology becoming ever more powerful and pervasive, applications of semiconductor technology increasingly include optical functions. One example of optical elements for photonic devices is the increasing use of lasers and fibers in combination with integrated circuits for innovative sensing and communication applications.
TeraXion, an indie Semiconductor company, is a leading manufacturer of innovative components incorporating fiber Bragg gratings, low noise lasers, and integrated photonic elements. Fiber Bragg gratings have been at the heart of our products for 20 years; we also offer this technology in four different markets, reaffirming its potential for countless cutting-edge applications.
Millimeter-wave (mm-wave) phased arrays can realize multi-Gb/s communication links but face challenges such as signal distribution and higher power consumption hindering their widespread deployment. Hybrid photonic mm-wave solutions combined with fiber-optics can address some of these bottlenecks. Here, we report an integrated photonic-assisted phased array transmitter applicable for low-power, compact radio heads in fiber to mm-wave fronthaul links. The transmitter utilizes optical heterodyning within an electronically controlled photonic network for mm-wave generation, beamforming, and steering. A photonic matrix phase adjustment architecture reduces the number of phase-shift elements from M N to M + N lowering area and power requirements. A proof-of-concept 2 8 phased array transmitter is implemented that can operate from 24-29 GHz, has a steering range of 40, and achieves 5 dBm EIRP at an optical power of 55 mW without using active mm-wave electronics. Data streams at 2.5 Gb/s are transmitted over 3.6 km of optical fiber and wirelessly transmitted attaining bit-error rates better than 10-11.
This sub-committee seeks original submissions in fiber photonics, including fiber lasers and amplifiers, linear and nonlinear effects, devices, fiber materials and fabrication. Example topics include:
One problem, however, is that Si is not a direct band-gap material, making it very difficult to use to create lasers, semiconductor optical amplifiers (SOAs), or other gain elements. Thus, the industry began searching for ways to integrate the best III-V lasers and gain elements with Si. The traditional solution to this problem, and how most of photonic systems are built today, has been to use discrete III-V laser chips and other optical components to create and amplify light and then bring that light into the Si PIC using optical fiber, usually by aligning the fiber with grating structures on the PIC to guide the light into the horizontal plane of the Si PIC.
More recently, fabrication by inkjet printing of an elliptical mirror on a planar waveguide was reported for lateral coupling with a lensed VCSEL [21]. The use of polymer-lensed fibers instead of standard ones was also proposed to improve tolerances [22] as well as the polymer bonding of 90 connectors [23]. In the past several years, diverse assembly designs including a 45 end facet optical guide equipped with an integrated mirror close to the VCSEL surface were reported to achieve coupling and deflection with no need for a lens [24]. A fully flexible optoelectronic foil based on such direct coupling configuration was also recently demonstrated [25]. Despite significant advances on alignments tolerances, hybrid assembly remains sensitive to positioning errors and is not totally collective. Therefore, direct integration of microoptical elements on VCSEL surface can constitute a better solution for packaging cost reduction.
Photonic devices, such as a laser or optical fiber, use light to perform useful work and integrated devices include many different elements. Photonics are used widely in telecommunications, and ongoing research is making them smaller and more versatile.
The Masters of Science degree in Photonics is an interdisciplinary degree that is designed to provide students with a broad training experience in the various aspects of photonics, including topics in Physics, Electrical Engineering and Materials Science and Engineering. It covers both theoretical and practical topics in areas such as fiber optics, integrated optics, lasers, nonlinear optics and optical materials to prepare the students to work in industry directly after graduation. The program is also designed so as to make it possible for students who wish to continue on for a Ph.D. to still satisfy the requirements of their individual departments for the more advanced degree. For details on this program, see the separate catalog section under Interdisciplinary Graduate Study and Research.
Recent developments of photonic integrated circuits for the mid-infrared band has opened up a new field of attractive applications for group IV photonics. Grating couplers, formed as diffractive structures on the chip surface, are key components for input and output coupling in integrated photonic platforms. While near-infrared optical fibers exhibit large mode field diameters compared to the wavelength, in the long-wave regime commercially available single-mode optical fibers have mode field diameters of the order of the operating wavelength. Consequently, an efficient fiber-chip surface coupler designed for the long-wave infrared range must radiate the power propagating in the waveguide with a higher radiation strength than a conventional grating coupler in the near-infrared range. In this article, we leverage the short electrical length required for long-wave infrared couplers to design a broadband all-dielectric micro-antenna for a suspended germanium platform at 7.67 µm. The design methodology is inspired by fundamental grating coupler equations, which remain valid even when the micro-antenna has only two or three diffractive elements. A simulated coupling efficiency of 40% is achieved with a 1-dB bandwidth broader than 430 nm, which is almost twice the typical fractional bandwidth of a conventional grating coupler. In addition, the proposed design is markedly tolerant to fiber tilt misalignments of 10. This all-dielectric micro-antenna design paves the way for efficient fiber-chip coupling in long-wavelength mid-infrared integrated platforms. 041b061a72