TATSUTA Electric Wire & Cable Co., Ltd.

Business Units

Optical Fiber Components

Independently developed by TATSUTA, our processing technology in fiber optics has been the base of a history of working together with our customers for more than 20 years. From visible light to light that is invisible to the naked eye, a wide spectrum of optical wave lengths can be manipulated to create not only individual product units with more unique characteristics, but also with combinations of these units, TATSUTA is able to propose and realize products utilized in a broad range of fields from medical treatment to sensing and analysis.

OCT Interferometer Module

What is OCT
Image photo

OCT is a technology that visualizes the tomographic structure of an object using the coherence of light.
It is widely used in the medical field because it can irradiate near-infrared rays and can perform non-invasive and non-contact image.
Especially in the field of ophthalmology, it is an indispensable diagnostic device.
The scope of application of OCT is not only for medical applications such as ophthalmology, cardiology, dermatology, and gastroenterology, but also actively researching, developing and commercializing biotechnology in regenerative medicine and industrial fields such as laser welding monitoring.

Please contact us if you are interested in developing and massproducing of OCT equipments,

OCT construction requires a wide range of technologies. So building an OCT from scratch requires a lot of time, money and effort.
We will help you develop and commercialize OCT equipment with the technology and knowledge we have cultivated in the OCT field for many years with our partner company with a track record in the OCT field.
Please contact us if you are currently mass-producing OCT equipment and have problems in mass production, want to reduce costs, or are struggling to reduce costs,
We will provide optimal solutions based on the know-how we have cultivated so far.

1. Assembly technology using experiences

We have a wide lineup of optical fiber components that can be used in the 840, 1050, 1310, 1550 and 1700nm bands used in OCT.
By combining these, we will provide the optimum fiber interferometer module for your OCT system.

  • Photo:High-end SS-OCT module
    High-end SS-OCT module
  • Photo:SLD integrated SD-OCT unit
    SLD integrated SD-OCT unit
2. The Highest quality optical path length matching

Light sources used in OCT generally have a short coherence length. In order to obtain an interference signal, it is necessary to make the optical path length difference between the sample optical path and the reference optical path as close as possible. On the other hand, when constructing an interferometer by combining fiber components, It is very difficult to precisely control the fiber length difference (optical path length difference) between the sample optical path and the reference optical path.
Therefore, an optical path length variable mechanism (delay line) having a relatively large variable amount for adjusting the optical path length is usually required.
This results in larger systems, higher costs, and unstable performance.
We use our experiences and technology gained from designing and manufacturing many different types of fiber interferometers. Our products are highly praised from our customers by minimizing the problems.
With our modules, interference signals can be easily obtained only by fine-tuning the delay line with a small variable distance built into the sample optical system or reference optical system. If you are building a complicated fiber interferometer with the most advanced OCT research and are having a hard time adjusting the optical path length, or if you are having difficulty adjusting the optical path length in the production process of mass-produced products, please contact us once by all means.

figure:The Highest quality optical path length matching
3. Importance of stable “State of Polarization”(SOP)

Considering the stability of OCT sensitivity, it is important to stabilize the SOP due to changes in environmental temperature.
Optical fiber couplers made by other companies had the problem that the sensitivity of OCT fluctuated because the SOP greatly changed with temperature.
Therefore, in order to solve this problem, we have developed a unique and highly reliable optical fiber coupler for OCT applications that minimizes the fluctuation of the SOP due to temperature changes.
The graph below shows how the polarization state changes over time when the temperature is changed between 5 and 75°C. Compared to other companies' optical fibers, the fluctuation of the SOP with respect to temperature is greatly suppressed, indicating that it is extremely stable. At present, this optical fiber coupler is used by many companies and universities that conduct R&D and manufacturing of OCT, and the results have been reported (Reference 1).

Reference1 : Shinnosuke Azuma, Yoshiaki Yasuno et al. Clinical multi-functional OCT for retinal imaging Biomedical Optics Express(2019)

graph:Importance of stable “State of Polarization”(SOP)
High-performance custom case
1. SD (Spectral Domain) -OCT System configuration example
Mach-Zehnder interferometer
figure:SD-OCT System Mach-Zehnder interferometer
Michelson Interferometer
figure:SD-OCT System Michelson Interferometer
2.SS(Swept Source)-OCT System
Mach-Zehnder interferometer
*Mainly used for 1050nm band SS-OCT
figure:SS-OCT System Mach-Zehnder interferometer
Mach-Zehnder interferometer (using Circulator)
*Mainly used for 1300, 1550nm band SS-OCT
figure:SS-OCT System Mach-Zehnder interferometer (using Circulator)
3. Custom Module For SS-OCT System

Please contact us, if you meet the followings, and you are not satisfied with the current high performance SS-OCT.

  • If you are using an SS light source without a built-in k-Clock
  • Those who are dissatisfied with the performance of k-Clock with built-in SS light source
  • Those who are not satisfied with the stability of the electrical trigger output from the light source (for details on use cases, see Reference2)

Reference2 : Satoshi Sugiyama, Yoshiaki Yasuno, et al. Birefringence imaging of posterior eye by multi-functional Jones matrix optical coherence tomography Biomedical Optics Express(2015)

Configuration example of custom module for SS-OCT
figure:Configuration example of custom module for SS-OCT
Related products

Advanced melt drawing technology supports infrared wavelength range optimal for OCT Optical fiber coupler, FBG, optical fiber collimator, VOA, circulator are available.

Operating Wavelength
Band Width
Item specification
840nm ±40nm Coupler for OCT SPEC SHEET
1050nm ±50nm Coupler for OCT SPEC SHEET
1310nm ±60nm Coupler for OCT SPEC SHEET
1550nm ±60nm Coupler for OCT SPEC SHEET
1700nm ±60nm Coupler for OCT SPEC SHEET
1050/550nm - WDM Coupler for OCT SPEC SHEET
1300/660nm - WDM Coupler for OCT SPEC SHEET
1310nm - Circulator SPEC SHEET
1550nm - Circulator SPEC SHEET
790–  910nm - FBG for OCT SPEC SHEET
980–1120nm - FBG for OCT SPEC SHEET
1260–1750nm - FBG for OCT SPEC SHEET
For inquiries about Optical Fiber Components