Optical Modules (Photodiodes)

Yokogawa's full-WDM-band photodiode modules have high sensitivity at 40 Gbps not only in the S, C, and L bands, but also in the O, E, and U bands, meaning that they can cover all the bands used in WDM transmission.
The photodiode is based on InP and is designed with a small junction diameter and reduced undoped InGaAs layer thickness to achieve a high-frequency responce and optimize the carrier transport time and the RC constant. In addition, the effective relaxation of lattice mismatch in the InGaAs layer results in low dark current with high sensitivity in the U band (1625 to 1675nm).
To meet customer demands in commercial transponder and transceiver applications, Yokogawa offers a 40Gbps receiver module with a trans-impedance amplifier (TIA), limiting amplifier (LA) and small GPPO compatible connectors.
Yokogawa has also released a 10Gbps full-WDM-band photodiode module with a TIA in a surface-mount ceramic package, which is highly regarded for its flat frequency response. This 10Gbps photodiode (10G PIN/TIA) is expected to have higher wavelength efficiency for L band edge applications and U band fiber monitoring applications.

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10G photodiode responsivity vs wavelength

10G photodiode responsivity vs wavelength

Responsivity of full-WDM-band 10G photodiode.