PISÉO employed these specific abilities in the service of the company EASii-IC in January 2021 to create an integrated circuit (ASIC) dedicated to air-based telecommunication applications (Li-Fi).

Customer requests and constraints

EASii-IC is an electronics manufacturer developing an ASIC allowing optical communication between two mobile devices. They needed to validate the maximum power of the light source in order to comply with regulations on optical risks. At the end of 2020, PISÉO was called upon to assist.

The ASIC must ensure communication between the two devices, sharing information and data. It will drive the emitting light source and the receiving photodiode. To ensure an optimal user experience, it is necessary to guarantee a bandwidth of 200 MHz for a data rate of 1 Gbps. EASii-IC wanted to compare different solutions based on LED or laser light sources. It therefore became a question of determining the optimal compromise between technical performance and optical risk. The final product must have the greatest possible range between the two devices while respecting the standards in force and the users’ health.

Indeed, LEDs can emit high levels of radiation at short wavelengths (blue light), which have physiological effects on the body. Lasers, in turn, can cause severe eye damage, in particular. Therefore, choosing one or the other technology is crucial to ensure compliance with French and European standards and regulations that protect users.

The PISÉO approach: preliminary studies and recommendations

PISÉO committed to its client to:
• conduct a market inventory of transmitters and receivers adapted to the signal (wavelength, sensitivity, frequency, etc.)
• compare the different technologies available to determine the best solution

PISÉO’s experts first analyzed the LED and laser light sources (VCSEL) which met the minimum technical constraints requested. They have been innovative in adapting to their client’s unique needs by developing their own digital computational model. Coupled with optical simulations carried out using Zemax software, this enabled them to identify the ocular optical risks of both LED and laser solutions and the advantages and disadvantages of each technology. EASii-IC was thus able to choose the most efficient technological combination while complying with the applicable optical safety standards: EN 62471 for LEDs or EN 60825 for lasers.

Finally, the exceptional knowledge of the market for artificial light sources and photodetectors also enabled PISÉO to be a driving force. Their work with their clients ranges from analysis to the recommendation of photonic components and their implementation in products.

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This phenomenon due to the reaction of riboflavin sensitive to UV and blue light is characterized by the appearance of a smell of “wet dog” called “Taste of light”.

The use of white LEDs containing blue light therefore presents a significant risk for the lighting of wine cellars.

Performed services

• Definition and realization of a protocol and means of experimentation.
• Studies of physical interactions between optical characteristics (spectral distribution, power, duration of use) of the LEDs and the appearance of the light taste.
• Support for the definition of specifications for the lighting of Champagne cellars. (CIVC)
• Testing and qualification of products.

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The 15 partners of the consortium, including PISEO, succeeded in demonstrating that it was possible to create digital optical-electric-thermal models of these components, and set up at the international level the normative bases (JDEC, CIE) which will allow LED manufacturers to make these models available to integrators.

Application

General lighting, automotive lighting…

Objective

As a Europena consortium, the objective is to develop a standardized method to create multi-domain (thermal-optical-electrical) LED based design and simulation tools for the solid-state lighting industry.

Performed services

• Characterization of about 100 different LED packages : High power, mid-power, CoB…
• Test results intercomparison between 5 european labs.
• Design, assembly and characterization of several luminaire prototypes developped using a brand new physical model of Cree XPG3 LED package.
• Dissemination of project outcome to professional and general public.

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Performed services

• Performance measurements using the PISEO LMT goniophotometer: flux, light distribution, power consumption
• Disassembly and critical analysis of product design and manufacturing: LED components used, optics, electronic design, mechanics, seals, etc.
• Summary and correlations between performance and design with regard to the intended application.
• Report and presentation of results to the Client.

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