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Tianjin Janhoo Optoelectronics Co., Ltd.

Tianjin Janhoo Optoelectronics Co., Ltd.(Janhoo) is a high-tech enterprise specializing in the R&D and production of domestic semiconductor optical amplifiers (SOA). At present, the company has launched a variety of semiconductor optical amplifier (SOA) products covering wavelengths of 1060nm, 1270nm, 1310nm, 1550nm and 1625nm, as well as reflective semiconductor optical amplifier (RSOA) gain chip products with wavelengths of 850nm, 1060nm and 1310nm and 1550nm.

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Latest News
[Noise Figure] The origin of the number 58 in the well-known 58 formula
2026-07-08

Many engineers engaged in optical module, trunk transmission and amplifier testing are taught the 58 Formula by senior colleagues when they first start their careers to quickly calculate noise figure and OSNR. However, in practical operations, they often find that the noise figure calculated via the ...

[Noise Figure] Why is the noise figure of some SOAs less than 3 dB
2026-07-07

It is widely acknowledged in the industry that the theoretical limit of the noise figure is 3 dB. However, during our actual noise figure testing of SOAs, we frequently encounter noise figure values below 3 dB (typically for SOAs operating under high bias conditions), which often leads customers to ...

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