FW-PWPD-025/R13T15-PD-09-025 is an integrated FWDM wavelength division photo-detector device. The module couples and encapsulates optical signals from the transmission port (1550 nm) and reflection port (1310/1490 nm) of the FWDM component simultaneously into high-responsivity photo-detectors (PDs), enabling independent photoelectric detection for three wavelength channels with a single fiber input.   Adopting a compact hermetic package design, this device highly integrates wavelength division multiplexing and photodetection functions. It greatly simplifies the optical path of the system and reduces overall equipment size, making it an ideal candidate for PON network monitoring, optical power monitoring (OPM), channel monitoring in WDM systems and other applications.