news digest ♦ Telecoms
While current fibre to the home (FTTH) services are mainly based on 1 Gbps gigabit Ethernet passive optical networks (GE-PON), symmetric 10G-EPON offering 10 Gbps upstream and downstream performance are expected to be commercialised soon. However, 10G-EPON are simple networks that use optical couplers and require high-power DFB-LD and high-sensitivity APD due to optical loss in the couplers. Mitsubishi Electric›s new high- power, low-current DFB-LD and high-sensitivity APD are both suitable for symmetric 10G-EPON ONUs and thereby will contribute to network simplification and faster broadband service. The high-power, low operating current DFB-LD, which has an AlGaInAs active layer, offers 10 Gbps high- speed performance due to improved modulation bandwidth. It can operate at 10 mW output power despite low operating current in high-temperature conditions. The TO-CAN APD featuring an AlInAs multiplication layer has a typical top-level sensitivity of 31.5dBm, low-noise and a new high-frequency circuit board with suppressed noise output.
Further specifications of the products are below:
DFB-LD ML7 xx42
PD8xx24φ4.8mm TO-CAN packa ge
CAN package Aspherical lens cap with high coupling efficiency
Products with
ball lens cap Light emission peak wavelength: 1,270nm
Wavelength
band: 1,570nm Output power: 10mW
responsivity: 0.8A/W (typ.*2) Operating temperatures: -5℃to 75℃
*2 *3
sensitivity: -31.5dBm (typ.*2) Operating current: ≤70mA
Minimum APD
Bandwidth: 6.5GHz (typ.
*3) Coupling efficiency: 60%*1 (typ. *2) *1
ML767T42 with aspherical lens. Typical value, not guaranteed.
Typical value at multiplication factor M=10. APD φ5.4mm TO-
Oclaro expands high bit rate transponder portfolio
The firm says its latest transponders leverage its history in delivering coherent solutions, its competencies in indium phosphide and lithium niobate (LiNbO3) material technologies, its vertical integration in optical components, and its production and application expertise.
Oclaro, an has further strengthened its coherent product portfolio with the introduction of the MI 8000XM, a high-performing, low-power 100 Gbps MSA-compliant coherent transponder module.
The MI 8000XM is the second member of the Oclaro coherent transponder family, joining the MI 5000XM 40 Gbps coherent module, which is currently shipping in volume.
Both the new 100 Gbps and the current 40 Gbps modules employ a PM-QPSK modulation format combined with coherent detection. Coherent detection, the leading technology for enabling 100 Gbps and higher optical transmission, delivers the scalability and flexibility needed for transmitting more bandwidth cost-efficiently over fibre optic networks.
Complementing this family, Oclaro also has an established leadership position in the high bit rate direct detection transponder market with 40 Gbps transponders providing DPSK and DQPSK modulation formats with volume shipments that started in 2007. Oclaro also provides a full range of the optical components necessary to implement complete transponder solutions.
By providing customers with both coherent and direct detection module families and the key associated components, Oclaro enables network equipment manufacturers to develop market- leading, cost effective transponders for both new next-generation network implementations as well as upgrades on existing networks.
“Following on the success of our 40 Gbps transponders, the 100 Gbps MI 8000XM leverages Oclaro’s expertise in module design combined with a deep understanding of high bit rate propagation challenges in optical fibre networks,” said Terry Unter, President and General Manager of the
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www.compoundsemiconductor.net November/December 2011
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