Iridian Spectral Technologies Ltd (Iridian) – Ottawa, ON, Canadawww.iridian.ca – Iridian Spectral Technologies Ltd is a diversified optical filter manufacturer that is an international leader in filter design and manufacture especially for application in the fields of fiber optic communications, optical spectroscopy, 3D entertainment, and in aerospace. Iridian Spectral Technologies Ltd was ranked as one of the top 150 high technology companies in Canada in the 2011 and 2012 Branham300 rankings and won the 2010 Canada Export Achievement Award for the province of Ontario sponsored by Profit magazine together with Export Development Corporation (EDC). Iridian Spectral Technologies Ltd is a global supplier with distributors in many countries particularly in Asia.   Follow us on Twitter @IridianSpectral


Optical Filters And Etalons For Datacom Applications
Data center evolution is driving demand for ever-higher data transmission rates, necessitating innovation in data center optical interconnect component design.  Continue Reading..
The Application Of WDM Channel Skip Filters
Channel skip filters enable precision band splitting in telecommunications options, offering improved performance over edge pass filters at a cost adaptable to any project budget.  Continue Reading..
Advantages Of Multiple Band Pass Filters In Telecommunications Applications
Multi band filters help optimize price-performance balance while also conserving space, simplifying design, and improving (or offering equivalent) performance versus single band filters.  Continue Reading..
Iridian Spectral Technologies
Wavelength Budgeting For Optical Filters
Considerations when specifying transition pass bands, blocking bands, and transition widths include filter manufacturing tolerances, thermal tolerances and source/detector variations among others. These factors must be taken into account properly and completely in order to achieve the spectral performance required for an application.  Continue Reading..
Hybrid Gain Flattening Filters In Optical Fiber Amplifiers
Hybrid GFFs save space, simplify system layouts, cost less than a two-filter setup, and offer unparalleled reliability. Meet the new standard in optical fiber amplifier components.  Continue Reading..
Messages From Above — Optical Satcom Lights The Way
The next advances in communications, 5G and machine-to-machine communications, will require “help from above” to blanket literally every corner of our planet with high-speed, ultra-low latency, secure networks — telecom meet satcom.  Continue Reading..
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Remote Sensing With LiDAR Requires Optical Filter Trade-Offs
Engineers and designers working on LiDAR applications should consider critical filter issues early on.  Continue Reading..
Specifying Surface Figure And Wavefront Distortion For Multi-layer Optical Filters
Specifying Surface Figure And Wavefront Distortion For Multi-layer Optical Filters
This white paper helps the reader understand where, when, how, and how much to specify wavefront distortion to ensure that functional requirements of filters are guaranteed while unnecessary and costly constraints are avoided.  Continue Reading..
LiDAR And Optical Filters – Helping Autonomous Vehicles See More Clearly
The evolution of sensing and imaging systems, combined with the desire to create safer, more efficient transportation systems, is driving the development of autonomous vehicles. LiDAR is a key technology that will eventually help carry this growth through to “Level 5” autonomy.  Continue Reading..
Imaging Color Filters
The Right Filter Is Key To Lower Cost And Faster Time-To-Market MWIR Equipment
Midwave infrared (MWIR) light is important in many hardware applications, and optical filters are critical to success. Some simple practices can help avoid over-specifying filter characteristics and driving up costs.  Continue Reading..
Optical Interconnects For Data Centers – Lighting The Cloud
Optical Interconnects For Data Centers — Lighting The Cloud
The demand for storage and data transfer capacity has increased dramatically over the last decade. The need to constantly access and transfer data to and from, as well as within, data centers has placed a huge load on the interconnects connecting the backplanes of data servers.   Continue Reading..
Frequently Asked Questions: Optical Thin Film Filters
Frequently Asked Questions: Optical Thin Film Filters
This article answers an array of frequently asked questions about optical thin film filters. It provides in-depth information on what they are, how they are created, how they perform, and what to look for when selecting an optical thin film filter supplier.  Continue Reading..
The Eyes Of The Instruments: Using Optical Filters To Observe And Measure Earth From A Different Perspective
An improved ability to manage or understand the natural or influenced phenomena is critical to ensuring that we maintain a healthy planet capable of sustaining humanity as part of its diverse biomass. But understanding these phenomena and how they are changing over time requires measurement.  Continue Reading..
Large-Format, Narrow Band Pass Filters (NBPF) – A Uniformity Challenge
Large-Format, Narrow Band Pass Filters (NBPF) – A Uniformity Challenge
Within so many diverse optical filtering applications, large-format (>100 mm diameter), narrow bandpass filters (NBPF) are required to be used alongside large collection optics in order to facilitate specific and selective analysis of a phenomena or the substance of interest.  Continue Reading..
Enhancing Endoscopy With Optical Filters
While white-light reflectance (WLR) imaging has become the standard for in vivo diagnosis using “conventional endoscopy,” this white paper details three alternatives — or supplements — to WLR that leverage the wavelength selectivity provided by optical filters.  Continue Reading..
Optical Filters: Right In Front Of Your Eyes
Continued improvements in multilayer thin film filter (TFF) design and manufacturing methods — such as in-situ optical monitoring and automated coater control with dynamic design adjustment — have enabled successful production of optical filters with increasing control over the spectral shape.   Continue Reading..
optical filters
Clear The Air: New Optical Filters For Sensors And Detectors
Environmental air quality; proximity control; crowd counting; climate change; the “Internet of Things”.  Our world has become an increasingly monitored place where the proliferation of sensors and detectors allows us, and our devices, to better understand and interact with our environments.    Continue Reading..
Optical Filters For Raman Analysis: Finding The Needle In The Haystack
Most Raman microscopy applications seek to maximize access to the Raman fingerprint of the molecule of interest, requiring filters that provide “more signal with less background.” This article discusses optical filters for Raman analysis, addressing filters for both bench-top and portable Raman applications.  Continue Reading..
How To Specify A Filter
How To Specify A Filter
In general, typical filter optical specifications will include the wavelength ranges over which to reflect and transmit light, clear aperture of the filter, the polarization state of light for non-normal angles of incidence, light coherency (laser or white light), optical beam size and cone angle of light, and more.   Continue Reading..
“Fingerprint” Vs. Handheld Raman Applications And The Different Optical Filters That Enable Them
When combined with microscopy, Raman spectroscopy can be used as a noninvasive, noncontact solution for exploring specific cellular structures and functions. It is no wonder that Raman has established a presence as an invaluable analytical technique both in labs and in the field.  Continue Reading..
Understanding Edge Filters For Raman Spectroscopy
Since the excitation source laser intensity is often six to eight orders of magnitude greater than the Raman scattered signal, edge pass filters are required to block the wavelength of the scattered laser beam while transmitting the wavelength shifted Raman scattered signal.  Continue Reading..
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Solving PCR Filter Challenges For High-Performance qPCR Instruments
qPCR instrument users need high sensitivity and pristine signal clarity to achieve numerous delicate tasks. The right combination of optical filters significantly improves this functionality.  Continue Reading..


The Growth Of LiDAR For Autonomous Vehicles - Image
The Growth Of LiDAR For Autonomous Vehicles
What is a steering wheel? This might not be such an odd question for drivers in the near future. As autonomous vehicles begin to dominate our roads, LiDAR will be an important technology that will allow them to navigate and respond in a safe manner.  Continue Reading..
Iridian Spectral Technologies: The #1 Choice For OEM Manufacturers
Iridian Spectral Technologies: The #1 Choice For OEM Manufacturers
Iridian Spectral Technologies offers advanced thin film optical filter technology for telecom, spectroscopic instrumentation and lasers, as well as biophotonics, micro-optics, and aerospace applications.  Continue Reading..
Datacom Filters: Lighting The Cloud
As Datacom applications become more widespread, greater requirements are placed on optical filter reliability, storage capabilities, smaller sizes, and costliness. At Photonics West 2018, Jason Palidwar of Iridian Spectral discussed the importance of the use of optical filters in regards to how they help transfer, store, and access data from the Cloud<>  Continue Reading..
You Cannot Manage What You Cannot Measure: Optical Filter Manufacturing
You Cannot Manage What You Cannot Measure: Optical Filter Manufacturing
On the first day of DCS 2017, Jason Palidwar, with Iridian Spectral Technologies, spent a few minutes with us talking about the 3 key criteria that apply to all of the filters his company manufactures – surface quality, spectral characteristics, and durability and reliability.  Continue Reading..
The Challenges Of Using And Manufacturing Optical Filters In Earth-Observation
The Challenges Of Using And Manufacturing Optical Filters In Earth-Observation
Optical filters play a key part in providing wavelength selections in earth-observation systems, but they provide a unique challenge in space-based applications. Jason Palidwar with Iridian Spectral talked to us about some of those challenges, and how his organization has addressed them.  Continue Reading..


Iridian Spectral Technologies

2700 Swansea Crescent

Ottawa, ON K1G6R8


Phone: 613-741-4513

Contact: Jason Palidwar


  • Iridian offers over 20 years of experience in producing industry leading optical telecommunication and datacom filters for terrestrial systems. Commercial satcom networks will consist of constellations of 100’s to 1000’s of satellites in an interconnected low earth orbit (LEO) mesh. Many of these systems rely on an optical intersatellite link (OISL) architecture to connect satellites via laser based optical communications. Optical filters provide wavelength selectivity to these systems addressing different functional needs from solar rejection windows to beam steering wavelength selective dichroic filters.

  • Iridian Spectral Technologies offers LiDAR laser sensor systems with common laser wavelengths including 532 nm, 905 nm, 1064 nm, and 1550 nm. These filters provide more signal with less background and are ideal for laser sensor applications, including airborne laser scanning and other methods of capturing 3D data of large areas.

  • In Raman spectroscopy applications, emitted light is very close in wavelength range to the excitation light. In order to attenuate a laser’s signal from reaching the detector while at the same time transmitting the weak emitted light signal, notch or edge pass Raman filters are required. Because of their high transmittance and extended deep blocking, Raman laser line filters are also required to ensure that only the desired wavelength is actually illuminating the sample being tested. This page provides an overview of Iridian Spectral Technologies' line of filters for Raman spectroscopy.

  • Iridian Spectral designs and manufactures optical filter solutions for long haul and metro access fiber-optic telecom customers. Iridian also applies the same proven thin film filter technology to address the growing needs for Datacom optical filtering providing wavelength selectivity to DCI devices such as transceivers and tunable laser assemblies (TLA).

  • In astronomical observations, optical filters are able to provide the wavelength selectivity needed to enable telescopes to discriminate signal from background information. These filters often require larger sizes, higher uniformity, and excellent surface quality and surface figure.

  • Iridian Spectral Technologies ships anywhere between 10,000 to 40,000 telecom filters per week. These filters are used in a wide variety of telecom applications, including wavelength multiplexing and de-multiplexing,  optical amplification/gain flattening, laser wavelength stabilization, pulse dispersion compensation, fiber-to-the home/business, and fiber line monitoring. More details on the applications can be found below.

  • Iridian offers excitation, dichroic, and emission fluorescence spectroscopy filters for confocal microscopy, flow cytometry, and other biomedical applications. These dichroic (FLD) and emission (FLE) filters deliver more signals with less background noise, and are compatible with common excitation sources and fluorophores. They also feature high transmission and reflection levels, low ripple, steep edges, and deep blocking outside of the pass band.

  • Iridian Spectral Technologies' MLWIR (mid-long wave infrared) bandpass filters provide narrow and high transmission in the 2-10µm wavelength region, ultimately enabling an optical systems’ ability to detect a gas and its concentration in environmental and process analysis.

  • Iridian Spectral offers edge, notch, and band pass optical filters covering the 300nm (UV) to 10µm (LWIR) wavelength range for biomedical instrumentation, and medical devices for endoscopy and laparoscopy.



  • Iridian Spectral Technologies delivers an array of ultra-performance filters for real-time PCR applications. These ultra-PCR fluorescence filter sets are designed to provide a high signal-to-noise ratio of the probes embedded in PCR samples when illuminated with an LED light source. These customized emission, excitation, and dichroic filters deliver more signal with less background noise to the fluorescent users and OEMs.

  • Iridian Spectral Technologies delivers fluorescence emission filters, excitation filters, fluorescence filter sets, and fluorescence multi-band filters for fluorescence analysis instruments, fluorescence imaging instruments and fluorescence microscopes. The available emission, excitation and dichroic filters provide more signal, less background noise, high transmission and reflection levels, low ripple, steep edges, and deep block to fluorescence instrument users and OEMs.

  • Iridian Spectral Technologies delivers an array of optical filter solutions, including bandpass filters, edge pass filters, and dichroic filters for Raman spectroscopic applications. Iridian also offers partnership opportunities to develop custom filter solutions.

  • Iridian Spectral Technologies offers optical filter solutions to address the growing needs for Datacom optical filtering applications. These Datacom filter solutions can now address needs like wavelength division multiplexing (WDM) in transceivers, broad bandpass filters transmitting the entire O, C, or L-band, and silicon (Si) etalons for TLA. D

  • Iridian Spectral Technologies offers a line of fluorescence optical filters for $395 a set. These hard-coated dielectric filter solutions provide optimal wavelength discrimination for the detection of commonly used fluorophores in fluorescence microscopy.