グラビトン List of Products and Services

The "DLP-1" is a dual balance differential amplifier type O/E converter. Designed for OCT applications, it achieves reduced end-face reflection, wide bandwidth, and low noise while being compact. You will notice a significant difference as the observation light intensity decreases. Additionally, it is a suitable product for SS-OCT imaging systems with a wide bandwidth of DC to 400MHz. 【Features】 ■ Reduced end-face reflection ■ Uses an FC receptacle compatible with APC polished fiber ■ Wide bandwidth: DC to 400MHz ■ Low noise: NEP below 5pW/Hz in the region below 100MHz ■ Dimensions: 60×60×23mm (excluding protrusions) *For more details, please refer to the PDF document or feel free to contact us.

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Graviton Inc.'s O/E converter allows for easy optical measurement by attaching it to the input terminals of your oscilloscope or spectrum analyzer. This document introduces five types of products, including the "SPD series," as well as the "SPA series," "SPS series," "LPD series," and "LPS series." You can choose a model based on the light reception wavelength range, reference wavelength, light reception area, light reception NA range, and conversion frequency bandwidth. Please use this information for product selection. [Contents] ■ Selection Guide ■ SPD Series (SPD-1_650nm, SPD-3, SPD-4, etc.) ■ SPA Series (SPA-2_650nm, SPA-3, SPA-4) ■ SPS Series (SPS-1, SPS-2) ■ LPD Series (LPD-1, LPD-2) ■ LPS Series (LPS-1, LPS-2) *For more details, please refer to the PDF document or feel free to contact us.

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The "SPS Series" is an OE converter that achieves high sensitivity and low noise performance. We have developed a FET input type transimpedance amplifier. It ensures a wide bandwidth characteristic of 100MHz for the 10kV/W model and 15MHz for the 100kV/W model. The "SPS-2" features a uniquely designed optical system that achieves a light receiving core diameter range of φ1.0mm and a maximum receiving NA of 0.5. Upon request, we can also accommodate specifications for even higher conversion sensitivity. 【Features】 <SPS-1> ■ High Sensitivity 　・10kV/W 　・100kV/W ■ High Focusing Ability 　・φ0.8mm, NA=0.2 *For more details, please refer to the PDF document or feel free to contact us.

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The "SPD-1" is an OE converter that converts optical signals into electrical signals over a wide bandwidth. It is capable of observing the intensity modulation components of the input optical signal. It has a high collection capability that allows for observation in various fields, including CDs. Additionally, we offer "SPD-2," which is suitable for GI (high-speed) POF, as well as "SPD-3" and "SPD-4," which are compatible with multiple wavelengths. 【Features】 ■ For short wavelengths (visible light range) ■ Wide bandwidth ■ Available for 650nm and 850nm according to application ■ DC to 1.2GHz ■ Well-suited for observing red laser pickups and more *For more details, please refer to the PDF materials or feel free to contact us.

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The "SPA Series" is an OE converter capable of capturing and observing all emitted light from large-diameter optical fibers such as GI-POF and high-speed POF. The optical system is entirely composed of our unique design. Starting with the "SPA-2_650nm," which adopts a universal connector compatible with SC, ST, F05, and FC connectors, we also offer the "SPA-3," suitable for observing blue laser pickups, and the "SPA-4," which supports wideband and multi-wavelength applications. 【Features】 ■ Capable of capturing and observing all emitted light from large-diameter optical fibers ■ The optical system is entirely composed of our unique design *For more details, please refer to the PDF document or feel free to contact us.

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At Graviton Co., Ltd., we handle the OE converter 'SPD/SPA/LPD series'. By attaching it to the input terminals of your oscilloscope or spectrum analyzer, you can easily achieve optical measurement. It converts input optical waveforms into electrical output waveforms in a wide bandwidth, balancing a small body with a large light receiving diameter and receiving NA. It can be used for observing optical waveforms such as optical pickups and optical links. 【Features】 ■ Compact and lightweight ■ Easy attachment and connection ■ Excellent light collection capability ■ Wideband conversion from DC to GHz *For more details, please refer to the PDF materials or feel free to contact us.

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The "LPS-1_20KV/W" is a high-sensitivity long-wavelength OE converter that uses an InGaAs PIN PD. It employs a FET input type transimpedance amplifier (our unique design). It is suitable for various fiber sensor applications such as distortion detection and vibration detection. Additionally, we also offer the "LPS-2_20KV/W," which achieves both a large receiving field of view and high sensitivity of 20,000V/W. While the bandwidth may narrow, we can also produce products with even higher sensitivity, so please feel free to consult us. 【Features】 ＜LPS-1_20KV/W＞ ■ FET input type transimpedance amplifier adopted ■ Uses InGaAs PIN PD ■ Passband: DC to 100MHz ■ Conversion sensitivity: 20,000mV/W ■ Wavelength range: 900 to 1,650nm *For more details, please refer to the PDF materials or feel free to contact us.

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The "LPD-1" is an OE converter that converts optical signals in the range of 900 to 1650 nm into electrical signals over a wide bandwidth. Simply attach this device to the signal input terminal of an oscilloscope or similar equipment, and connect a fiber optic cable carrying the optical signal you wish to observe to the optical input connector. You can observe the intensity modulation component of the input optical signal. Additionally, we also offer the large-diameter long-wavelength OE converter "LPD-2." 【Features】 <LPD-1> ■ For long wavelengths ■ Converts optical signals into electrical signals over a wide bandwidth ■ Passband: DC to 1.5 GHz ■ Conversion sensitivity: 500 mV/mW @ 1300 nm ■ Wavelength range: 900 to 1650 nm *For more details, please refer to the PDF document or feel free to contact us.

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The "DLP-2" is a dual balanced O/E converter for OCT, newly developed based on our long-established I/V conversion circuit technology, featuring a bandwidth of over 1GHz, including DC, and capable of providing sufficient output voltage amplitude stably. Through optimal device selection and substrate design based on simulations and our track record, we have achieved symmetry in voltage amplitude characteristics. It ensures linearity across all amplitudes, allowing for the acquisition of clear, low-noise images without sacrificing resolution. 【Features】 ■ Ensures linearity across all amplitudes ■ Capable of acquiring clear, low-noise images without sacrificing resolution ■ Two connectors, Pos. and Neg., are mounted at an angle of 120 degrees to each other on the housing ■ Multiple engineering samples available *For more details, please refer to the PDF document or feel free to contact us.

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We handle the 'O/E Converter' that transforms your company's electronic measuring instruments into optical measuring instruments. Equipped with a uniquely designed optical system, it captures light signals from large-diameter fibers and high NA fibers without loss. Additionally, by attaching it to the input terminals of your oscilloscope or spectrum analyzer, you can easily achieve optical measurements. Please feel free to contact us if you have any requests. 【Features】 ■ Compact and lightweight ■ Easy to attach and connect ■ Excellent light collection capability: equipped with a uniquely designed optical system ■ Wideband conversion from DC to GHz * For more details, please download the PDF or feel free to contact us.

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The "MM1000S" is a 1-inch mirror mount that achieves drift-free performance and long-term stability immediately after adjustment, which was difficult with conventional mirror mounts. The new mechanism "M-Ring" realizes backlash-free operation. It features a compact design while also allowing for fine adjustments, combining two contradictory functions and maintaining excellent operability and remarkable long-term stability. 【Features】 ■ Received the "Contribution Award" at the 2015 Laser Society Industrial Awards ■ Ultra-high performance *For more details, please download the PDF or feel free to contact us.

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The pulse observation of laser processing machines, as well as the observation of lightning surges and ignition plugs, can be realized by constructing a dynamic optical power meter in combination with our high-performance O/E converter.

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It transforms your electronic measuring instrument into an optical measuring instrument. By attaching it to the input terminals of your oscilloscope or spectrum analyzer, you can easily achieve optical measurement. Its compact size fits in the palm of your hand. Weighing only about 130 grams, it is very lightweight, so it does not put a strain on the input connector. 【Features】 ■ Transforms electronic measuring instruments into optical measuring instruments ■ Achieves optical measurement by attaching to oscilloscopes and spectrum analyzers ■ Weighs only about 130 grams, making it very lightweight *For more details, please request documentation or view the PDF data available for download.

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In the SPD series, in order to capture emitted light from a fiber with as large a diameter as possible while using a PD with a small light-receiving diameter, the reduction ratio of the light-receiving optical system was set to 0.4 times. This allowed for the projection of emitted light from a fiber with a core diameter of 500 [µm] onto a PD light-receiving surface with a diameter of 0.2 [mm]. As a result, the maximum fiber NA value that could be received was limited to 0.25. In the SPA series, by changing the reduction ratio of the light-receiving optical system to 0.8 times, the maximum receiving NA was increased to 0.5. For example, using a PD with a receiving diameter of 0.8 [mm] in the SPA-2 at 650 nm, we successfully captured emitted light from a plastic fiber with a core diameter of 1 [mm] and NA=0.5, while maintaining a bandwidth from DC to 1.0 [GHz] during O/E conversion.

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- Ideal for testing POF, MOST devices, IDB-1394 devices, and gigabit Ethernet devices using POF. - Excellent light collection performance: Capable of capturing 100% of the emitted light from POF with a numerical aperture of 0.5 and a core diameter of 1.0 mm. - Wide bandwidth: Conversion frequency range from DC to 1.0 GHz. - Operates on a single power supply of +12V to +18V. - Supports all SC, ST, F05, and FC connectors by adopting a universal connector (model number: G_OCN, optional).

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For the observation of emitted light from optical communication devices, an O/E conversion sensitivity of several hundred V/W is not required to be very high. On the other hand, high conversion sensitivity is necessary for observing discharge light from PDPs and for optical measurement applications. The SPS series has been developed to achieve high conversion sensitivity with low noise while securing a certain bandwidth by newly designing the first stage TIA and providing two models with variations in the optical system.

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■Photodetector: InGaAs PIN PD ■Receiving Wavelength Range: 900[nm] to 1650[nm] (LPD-1) 950[nm] to 1650[nm] (LPD-2) ■Compatible Fiber Diameter: 80[um] or less (LPD-1) 500[um] or less (LPD-2) ■Receiving NA Range: Up to 0.2 (LPD-1) Up to 0.25 (LPD-2) ■Receiving Sensitivity: 500[mV/mW] @1310[nm] (LPD-1) 1000[mV/mW] @1310[nm] (LPD-2) ■Frequency Bandwidth: DC to 1.5[GHz] (LPD-1, LPD-2)

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- A new development of FET input type transimpedance has been achieved, realizing high sensitivity and low noise performance. - A wideband characteristic of 100 [MHz] for the 20 [kV/W] model and 15 [MHz] for the 100 [kV/W] model has been secured. - Upon request, we can also accommodate specifications for even higher conversion sensitivity. (Bandwidth, noise, and price are negotiable.)

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It is ideal for inspecting POF, MOST devices, IDB-1394 devices, and more.

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An O/E converter is a device that converts optical signals into electrical signals. Conversely, our E/O converter receives output signals from devices such as sweep generators and outputs modulated laser light from the optical output connector. The E/O converter is equipped with a 405nm LD model LL-400GI, and we offer E/O converters for other wavelengths including 658nm, 780nm, 830nm, and 1310nm, with the possibility of custom manufacturing for other wavelengths as well.

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