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Patent
Bandwidth10 inc and The Regents Of The University Of California | Date: 2014-05-29

A dual usage HCG VCSEL detector is provided with a high contrast grating (HCG) reflector first reflector that has a two dimensional periodic structure. The two dimensional structure is a periodic structure that is a symmetric structure with periodic repeating. The symmetrical structure provides that polarization modes of light are undistinguishable. A second reflector is in an opposing relationship to the first reflector. A tunable optical cavity is between the first and second reflectors. An active region is positioned in the cavity between the first and second reflectors. The photodetector is polarization independent. An MQW light absorber is included converts light to electrons. A dual usage HCG VCSEL-detector includes a high contrast grating (HCG) reflector first reflector, and a second reflector in an opposing relationship to the first reflector. A tunable optical cavity is between the first and second reflectors. An active region is positioned in the cavity between the first and second reflectors. The dual usage HCG VCSEL-detector that operates as a dual usage HCG VCSEL and as a tunable photodetector.


Patent
Bandwidth10 inc and The Regents Of The University Of California | Date: 2014-05-29

A photodetector is provided with a high contrast grating (HCG) reflector first reflector that has a two dimensional periodic structure. The two dimensional structure is a periodic structure that is a symmetric structure with periodic repeating. The symmetrical structure provides that polarization modes of light are undistinguishable. A second reflector is in an opposing relationship to the first reflector. A tunable optical cavity is between the first and second reflectors. An active region is positioned in the cavity between the first and second reflectors. The photodetector is polarization independent. An MQW light absorber is included converts light to electrons.


Grant
Agency: NSF | Branch: Fixed Price Award | Program: | Phase: | Award Amount: 199.88K | Year: 2014

Intellectual Merit

This Small-Business ERC Collaborative Opportunity transitioning agile broadband
transmitter for integrated access networks to market will address the challenge of achieving high
bandwidth (100+ Gb/s), low power, low cost wavelength division multiplexed (WDM) optical
communications links of distances up to 2 km for applications such as data centers and
aggregation networks. These links are necessary for next generation data center and
supercomputing applications that are a focus of the CIAN ERC?s research.
Specifically, this project will improve the lasers in these systems, which drive much of
the cost, performance, and power requirements for the links, to meet current commercial
specifications. The tunable VCSELs offer a 10X reduction in power and cost over conventional
solutions and enable high bandwidth links within data centers that not economically feasible with
current technologies.

Broader Impacts

The broader impact/commercial potential of this project is a drastic reduction in the cost
and energy requirements of optical links inside of data centers and supercomputers. Companies
such as Google, Microsoft and other large data-centric companies have been clamoring for this
type of product in the last year to maintain the rate of growth in their data center facilities.
Present WDM laser array solutions using DFB lasers require 10X the power and 10X the cost of
a VCSEL-based approach and are not economically feasible. Present 850-nm VCSEL-based
links, on the other hand, cannot be made into a WDM source without power-hungry TEC coolers
due to their lack of precise, gridded, wavelength control, limiting the overall link speed. Using a
1550 nm tunable VCSEL solves both the problem of gridded wavelength control and allows the
use of low cost single mode fiber and the developed infrastructure for 1550 nm WDM optical
links. The realization of tunable VCSELs in WDM systems will result in a 10X reduction in
both cost and energy requirements in high-speed optical links for data centers, enabling the
further scaling of computational power for next generation data center and supercomputer
applications.

Besides the technological impact, this collaboration program will offer CIAN students
insight and experience with the real world commercial product development process. The
students will be testing and giving feedback into the product development process, enhancing
their educational experience. The enhanced capabilities of the VCSELs will enable new
applications and enhance CIAN in it?s mission of supporting transparency wherever possible
with flexible wavelength conversion and optical switches, and supporting dynamically
reconfigurable heterogeneous traffic in the network.


Grant
Agency: Department of Defense | Branch: Missile Defense Agency | Program: SBIR | Phase: Phase I | Award Amount: 125.00K | Year: 2015

Bandwidth10 (BW10) proposes to design and implement its high-speed wavelength tunable vertical cavity surface emitting laser (VCSEL) technology at 1060 nm for use as a seed source for high energy laser systems using ytterbium-based (Yb) fiber amplifiers. Presently, the output power in ytterbium fiber amplifiers is typically limited by stimulated Brillioun scattering (SBS). By varying the seed source in the fiber amplifier either through phase or wavelength variation, the SBS can be significantly suppressed, allowing for significantly higher total output power from the laser system. Since the VCSELs are wavelength tunable, they are easily extendable to create a multi-channel system, which can be spectrally combined for an overall higher system power. Bandwidth10 has demonstrated wavelength-tunable lasers with wavelength tuning speeds in excess of 20 MHz, operating at 850 nm. Under this program, the company proposes to redesign their high-speed wavelength tunable VCSEL to operate at 1060 nm, making it compatible with high power ytterbium (Yb) fiber amplifier technology. The goal of this program is to deliver a low cost, low power, compact 1060 nm tunable VCSEL seed source with integrated phase/wavelength modulation suitable for ultra high power laser systems. Approved for Public Release 14-MDA-8047 (14 Nov 14)


Chase C.,Bandwidth10 inc | Rao Y.,Bandwidth10 inc | Huang M.,Bandwidth10 inc | Chang-Hasnain C.,Bandwidth10 inc | Chang-Hasnain C.,University of California at Berkeley
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

We demonstrate wavelength-tunable SFF transceivers operating at 1550 nm using a tunable VCSEL with a high contrast grating (HCG) as the output mirror. Tunable HCG VCSELs with a ∼25 nm mechanical tuning range and over 2 mW output power were realized. Error-free operation of an optical link using directly-modulated tunable HCG VCSELs transmitting at 1.25 Gbps over 18 channels spaced by 100 GHz and transmitted over 20 km of single mode fiber is demonstrated, showing the suitability of the HCG tunable VCSEL as a low cost source for next generation DWDM communications systems in access networks and data centers. © 2013 Copyright SPIE. Source

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