30 May 2011

Mitsubishi Electric launching 40G DQPSK quad PD module

On 1 June, Tokyo-based Mitsubishi Electric Corp is commercially launching a compact, power-saving 40Gbps differential quadrature phase-shift keying (DQPSK) photodiode (PD) module for optical signal reception in transmission devices used to send large data volumes between metropolitan areas. The firm expects to sell about 500 units per month of the FU-387SPP.

Mitsubishi Electric says that, as optical communication networks transmit increasingly large amounts of data over long distances, needs are mounting for higher transmission speeds and densely spaced wavelength division multiplexed channels using multi-level formats such as DQPSK. Transmission devices commonly use two PD modules as a set, each comprising two photodiodes and two transimpedance amplifiers (TIAs). However, Mitsubishi Electric’s new module combines these components in a single, smaller and integrated package, with a single 3.3V voltage source for the PD bias voltage (Vpd) and the TIA supply voltage (Vcc).

The 40Gbps DQPSK quad PD module integrates four photodiodes and two TIAs in one 11.0mm x 14.9mm x 6.7mm package, contributing to the downsizing of optical transmission equipment. The energy-efficient device also features what is claimed to be industry-leading low power consumption of 0.6W at 25ºC.

In addition, new surface-illuminated photodiodes achieve low polarization-dependent loss (PDL) of 0.1dB or less. The photodiodes have a wide detection range of 1520–1610nm (C-band/L-band), with responsivity of 0.85A/W (typical, at 1550nm wavelength). The bit-error ratio is 1.3x10–8 (Q=14.9dB), even after transmission over several thousand kilometers (OSNR=20dB/0.1nm, bit rate = 43Gbps). Input (for optical signals) is via an LC connector with four-tape fiber featuring a small bending loss. Output (for RF signals) is via a feedthrough with a differential signal interface.

Mitsubishi Electric says that, in the near future, it will market an optical signal-transmitting laser diode module to operate on the opposite end of the line from the new FU-387SPP signal-reception module.

Tags: Mitsubishi Electric 40G DQPSK quad PD module

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