We present a new configuration for a polymer wavelength division multiplexing (WDM) filter based on multimode interference. We developed a hybrid integrated subassembly module for 1.31- and 1.55-µm bidirectional operation. Active devices including a laser diode with a monitoring photodiode and a receiving photodiode were integrated on a silicon optical bench (SiOB) platform using a flip-chip bonding technique. A polymer WDM filter chip made of polymethylmethacrylate was fabricated using a hot embossing technique. We then investigated the optical performance of the transmitter and receiver subassembly module using a SiOB platform. This hybrid integrated subassembly module exhibited bidirectional 2.5-Gbit/s signal modulation with a minimum sensitivity of −20.5 dBm at a bit error rate of 10−10 and an optical crosstalk of −35 dB.
Broadband reflection mirror is an important optical device to make a wide resonance bandwidth of the multi-wavelength
fiber laser cavity including fiber Bragg grating mirrors. Though a chirped fiber Bragg grating has been used for
broadband reflection mirror device, it still requires more improvements in the control of reflection wavelength
bandwidth and reflection ratio, which are key design parameters of broadband reflection mirror. In this research, we
propose an integrated mirror circuit based on polarization-maintaining fiber Sagnac loop interferometer to utilize for
tunable resonance cavity of fiber laser with semiconductor optical amplifier. It is available to control both resonance
bandwidth by varying the length of polarization-maintaining fiber and reflection ratio by tuning the polarization state of
Sagnac loop. Broad resonance bandwidth of 40 nm could be obtained from Sagnac mirror with thes 0.15 m length of
polarization-maintaining fiber.
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