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High-bandwidth balanced photoreceiver suitable for 40 Gb/s RZ-DPSK modulation formats

: Schramm, C.; Bach, H.-G.; Beling, A.; Jacumeit, G.; Ferber, S.; Ludwig, R.; Ziegler, R.; Mekonnen, G.G.; Kunkel, R.; Schmidt, D.; Schlaak, W.; Unterbörsch, G.


IEEE Journal of Selected Topics in Quantum Electronics 11 (2005), No.1, pp.127-134
ISSN: 1077-260X
Journal Article
Fraunhofer HHI ()

A novel fully packaged balanced photoreceiver designed for 40 Gb/s DPSK applications at 1.55 µm wavelength is presented. Based on InP:Fe substrate two waveguide-integrated photodiodes with spot size converters are monolithically integrated with a distributed amplifier. This configuration leads to a high symmetry of the two optical inputs and avoids interconnection parasitics. The RF output of the photoreceiver is DC-coupled, but the design enables an interfacing to subsequent electronics without external bias-tee by using a negative bias supply at the source terminal of the integrated amplifier. A reduction of system costs and required space will be obtained by this concept. Mounted in a butterfly package, a 3 dB bandwidth of 42 GHz is achieved. RZ-DPSK experiments exhibit excellent operation of the balanced photoreceiver over a large dynamic range of optical input power up to +10 dBm. The high-power capability and the clear eye opening at low input power demonstrates the suitability for high performance core and metro systems.