QSFP TOSA/ROSA KAIAM is
currently supplying four wavelength TOSA / ROSAs for 40GBASE-LR4
applications, optimized for a QSFP form factor. Detailed specifications
are available on request.TOSAThe mini-TOSA consists of four CWDM DFB lasers, four monitor photodiodes, four shunt drivers, an optical multiplexer to combine the outputs from the four lasers, in a hermetic package with an LC receptacle with isolator, and flex circuit for interface to the transceiver PCB.The target application for this TOSA is for use in QSFP+ form factor pluggable transceivers for the IEEE 40GBASE-LR4 at 4x10.3125Gb/s, as well as other derived applications at aggregate bit rates of 4x (9.95 to 11.35 Gb/s).
Features
• four uncooled 1310nm CWDM 10Gb/s DFB lasers • extended temperature range (-5°C to 85°C; note: options on LD chip used in TOSA) • multi-rate operation • pin photodiode monitor • shunt drivers for low power dissipation and improved signal integrity performance • CWDM wavelength multiplexer/combiner • rectangular body fitting within a 6x6 mm cross section • LC receptacle, electrically isolated from signal ground • flex circuit • RoHS 6/6 • Telcordia GR468 qualified Figure 1
Mini-TOSA Functional Block Diagram (click to enlarge)  The functional block diagram of the mini-TOSA is shown in Figure 1. The TOSA electrical interface is via a flex printed circuit (FPC) having four 100Ω differential signal lines. The differential signal lines terminate in two 50Ω termination resistors in the shunt driver. The FPC has traces that connect to anodes of the four laser shunt driver pairs, and traces that connect to the cathode of four monitor photodiodes (MPD) with the anodes of the MPDs being connected to GND inside the TOSA. The FPC contains signal ground pads, as well as pads for the isolated case ground. The four lasers and shunt drivers sit on a MEMS Si optical work bench with
micro lenses for optical coupling to the 4:1 optical combiner. The output
of the optical combiner is coupled to an LC ferrule with optical isolator.
The LC receptacle contains a ceramic split sleeve for wiggle performance.
Each laser diode channel has a front facet monitor diode for automatic power
control during module operation. The front facet monitors are achieved by
small power taps within the optical combiner chip. ROSAThe mini-ROSA consists of four PIN photodiodes, four Trans Impedance
Amplifiers, an optical
Features
• Four PIN photodiodes • Four TIA (Trans Impedance Amplifiers) • CWDM wavelength demultiplexer • extended temperature range (-5°C to 85°C) • multi-rate operation • Global LOS alarm • Serial digital interface for DDM • rectangular body fitting within a 6x6 mm cross section • LC receptacle, electrically isolated from signal ground • flex circuit • RoHS 6/6 • Telcordia GR468 qualified Figure 2
Mini-ROSA Functional Block Diagram (click to enlarge)  The functional block diagram of the mini-ROSA is shown in Figure 2. The ROSA electrical interface is via a flex printed circuit (FPC) having four 100 Ohm differential signal lines. As the high speed lines are DC coupled to the output of the TIA, AC decoupling is needed on the transceiver PCB. The FPC has traces that provide low speed connections for the digital I/O, and traces for the voltage supply. The FPC contains signal ground pads, as well as pads for the isolated case ground. The input of the optical demultiplexer is coupled to an LC ferrule. The LC receptacle contains a ceramic split sleeve for wiggle performance. Each PIN photodiode is optically coupled to the demultiplexer wavelength outputs, and electrically wirebonded to the TIA RF inputs. The TIA provides a Global LOS alarm pin as well as a serial digital interaface to monitor the mini-ROSA performance as well as control TIA performance parameters. Learn about more KAIAM products: |
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