Abstract
A tunable channel-drop filter as essential component for the wavelength-division-multiplexing optical communication system has been demonstrated, which is based on polymer waveguide Bragg reflectors. For an ordinary Bragg reflector, the filtered signal is reflected toward the input waveguide. Thus an external circulator is required to separate the filtered signal from the input port, though it increases the total footprint and cost. For this purpose, we employed dual Bragg reflectors and a mode sorting asymmetric X-junction. The Bragg reflector exhibited a maximum reflectivity of 94% for a 6-mm long grating, a 3-dB bandwidth of 0.39 nm and a 20-dB bandwidth of 2.6 nm. The mode sorting crosstalk in asymmetric X-junction was less than -20 dB, and linear wavelength tuning was achieved over 10 nm at the applied thermal power of 377 mW.
Highlights
Tunable optical wavelength filters are one of the essential components for wavelength division multiplexed optical communication system [1, 2]
A tunable channel-drop filter as essential component for the wavelength-division-multiplexing optical communication system has been demonstrated, which is based on polymer waveguide Bragg reflectors
For an ordinary Bragg reflector, the filtered signal is reflected toward the input waveguide
Summary
Tunable optical wavelength filters are one of the essential components for wavelength division multiplexed optical communication system [1, 2]. Widely tunable wavelength filters can be demonstrated by thermo-optic tuning of polymeric Bragg reflector waveguide, and its long-term reliability was verified [10,11,12,13,14]. The polymer Bragg reflector has single electrode for wavelength tuning compared to the sampled grating device which requires at least 3 control electrodes [15]. It becomes important in the implementation of WDM system. An external magneto-optic circulator is necessary to separate the filtered signal from the input waveguide It increases the size of the device and the cost. The wavelength tuning over 10 nm is achieved with a channel crosstalk less than −20 dB
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