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The 140GBd Integrated Coherent Transceiver Optical Sub-Assembly (IC-TROSA) type 2 is a cutting-edge solution in the realm of optical communication. This advanced IC-TROSA is designed to meet the increasing demand for high-capacity, high-speed data transmission, integrating multiple sophisticated components to achieve outstanding performance metrics.

Optical module with a transmit power greater than 0dBm
Optical module with a transmit power greater than 0dBm

Components of IC-TROSA Type 2

The IC-TROSA type 2 comprises three key components:

  1. Laser Source

  • Technology: InP-based (Indium Phosphide) solution.

  • Linewidth: < 100 kHz.

  • Spectral Range: 5 THz.

  1. Modulator

  • Technology: InP-based solution.

  • Integration: Includes a Semiconductor Optical Amplifier (SOA).

  • Voltage: Vpai < 1.4V.

  • Bandwidth: > 60 GHz.

  1. Integrated Coherent Receiver (ICR)

  • Technology: InP-based solution.

  • Channel Capacity: Supports 150 GHz spacing and 40x800 Gbps, achieving a total capacity of 32 Tbps.

 IC-TROSA used in 800Gbps transmission
IC-TROSA used in 800Gbps transmission

Design and Integration

The choice of Indium Phosphide (InP) material for the IQ modulator, combined with the integration of an SOA, significantly enhances the output power to 0 dBm.

How InP modulator to improve the output power with SOA
How InP modulator to improve the output power with SOA

The tunable laser features an InP Distributed Bragg Reflector (DBR) integrated design, suspended in the middle for thermal isolation. This design also employs InP DBR with a similar suspension, optimizing linewidth reduction through thermal tuning.

InP thermotuned tunable laser
InP thermotuned tunable laser

Key Features and Performance

  • Tunable Laser Adjustment: Utilizes a vernier tuning mechanism through the Y-branch of the tunable laser's rear grating arms.

  • Error Rate and OSNR:

  • Offline Testing: Achieves a pre-FEC bit error rate of 2e-2 with a receiver OSNR of 20.8 dB.

  • Real-time Testing: At 118.2Bd QPSK, the receiver OSNR is 20.3 dB. For 118.2GBd 16QAM, the receiver OSNR reaches up to 26 dB.

The coherent module employing this optical device facilitates 800Gbps transmission at 140GBd. However, considering testing environment impacts on bandwidth, performance evaluations primarily focus on the 118-120Gbd range.

offline DSP testing 120GBd 16QAM
Offline DSP testing 120GBd 16QAM

Real time DSP testing 120GBd 16QAM
Real time DSP testing 120GBd 16QAM


The 140GBd IC-TROSA type 2 exemplifies the forefront of optical communication technology, offering high bandwidth and capacity with exceptional error rate performance. By leveraging InP technology and advanced integration techniques, this IC-TROSA sets a new standard for high-speed data transmission, meeting the demands of modern communication networks. GEM Optics provides the package solution for 800G data transceiver.

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