Ultra-Compact Coherent Receiver Based on Hybrid Integration on Silicon

We experimentally study the sensitivity limits of an integrated Si-photonic dual-polarization balanced coherent receiver co-packaged with transimpedance amplifiers. For 28 Gbaud PDM-QPSK and PDM-16QAM signals, we compare colorless and optical preamplifierless reception to the case where an optical preamplifier and optical filters are used before the receiver. Back-to-back receiver sensitivities are evaluated. After propagation over an SMF-28e + EDFA amplified link and assuming a 3.8 × 10 −3 FEC threshold, colorless/preamplifierless reception using the Si-photonic receiver allows for error-free transmission of 112 Gbps PDM-QPSK over 4800 km at a received power of −23 dBm and of 224 Gbps PDM-16QAM over 640 km at a received power of −17 dBm. Finally, a 16 × 112 Gbps PDM-QPSK WDM experiment is carried out. Using the Si-photonic receiver for colorless/preamplifierless reception of all channels, we achieve error-free transmission for all channels over 4160 km at a received power of −21 dBm per channel. Results reveal that the receiver provides excellent sensitivity while allowing us to save cost, footprint, and power if used in a colorless/preamplifierless scheme.Index Terms-Integrated Si-photonic receiver, polarization division multiplexing (PDM), wavelength division multiplexing (WDM), forward error correction (FEC)

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“…The coherent receiver is based on silicon photonics (SiP) technology which enables a very compact design [13]. Fig.…”

Section: Integrated Coherent Receiver Designmentioning

confidence: 99%

Colorless and Preamplifierless Reception Using an Integrated Si-Photonic Coherent Receiver

Morsy-Osman

Chagnon

et al. 2013

IEEE Photon. Technol. Lett.

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“…3 [2]. CW light at 1554 nm was launched into the modulator whose arms are driven by two DACs each generating 2 or 4 levels corresponding to either QPSK or 16QAM modulation format.…”

Section: System Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Photonic integration is seen as the most promising avenue to address these problems. In particular, integration on silicon photonics (SiP) attracts enormous interest due to its potential for low cost, high level of integration and ultra-small footprint [1][2].In this paper, a coherent receiver is demonstrated using hybrid integration on silicon photonics. The potential for a very small footprint component is demonstrated by compact packaging.…”

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confidence: 99%

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A small form factor Si-based coherent receiver

Painchaud

Poulin

Pelletier

et al. 2013

2013 Optical Interconnects Conference

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A coherent receiver based on silicon photonics is presented. Its performance is confirmed at 112 Gb/s with PM-QPSK modulation at 28 Gbaud up to 4800 km and at 224 Gb/s with PM-16QAM up to 640 km. The packaged core has very compact dimensions of 6mm×8mm. IntroductionHigh-speed Coherent communication systems are now deployed in long-haul links especially at 100 Gb/s and are increasingly considered as well for shorter reach. While increasing the physical density, minimizing the power consumption, heat dissipation and component size becomes a stringent requirement. Photonic integration is seen as the most promising avenue to address these problems. In particular, integration on silicon photonics (SiP) attracts enormous interest due to its potential for low cost, high level of integration and ultra-small footprint [1][2].In this paper, a coherent receiver is demonstrated using hybrid integration on silicon photonics. The potential for a very small footprint component is demonstrated by compact packaging. Good performance is confirmed by a transmission experiments at 112 Gb/s and 224 Gb/s using PM-QPSK and PM-16QAM at 28 Gbaud. DesignThe SiP chip was fabricated at ePIXfab and used for the passive part of the receiver. A standard single-mode fiber polished at an angle close to 45° is used to couple the light from the signal port to the SiP chip through a 2D surface grating coupler which also provides the polarization splitting [3]. For each polarization, a 2×4 MMI coupler (multimode interference) acts as a 90° optical hybrid that mix the signal with an optical local oscillator (LO) which is coupled from a polarization maintaining fiber to the SiP chip through a 1D surface grating coupler [4]. The outputs of each 2×4 MMI coupler are connected to 1D surface grating couplers allowing the light to emerge out of the chip and be collected by two 1×4 photodiode arrays that are flip-chip bonded on top of the SiP chip which is beforehand gold metallized. Capacitors are mounted on top of the chip and wirebonded to the photodiode cathodes for biasing purpose. The SiP chip is fixed on a ceramic substrate which allows carrying the RF signals properly. Two dual differential trans-impedance amplifiers (TIAs) are also attached on the ceramic in close proximity to the SiP chip. Their inputs are wirebonded to the photodiode anodes. Each differential TIA is connected to two photodiodes collecting the light from two out-of-phase outputs of a MMI coupler, thus providing balanced detection. The overall assembly is very compact with an area of only 6 mm × 8 mm as seen in the right part of Fig. 1 and corresponding to the schematic shown in the left part. Such a small assembly can fit a very small package whose dimensions are mainly limited by the electrical interface. SOI chip 8 mm 6 mm PD array TIA Signal Input Port LO Input PortFig. 1. Schematics of the coherent receiver (left) and picture of the coherent receiver assembly (right). Optical characterizationTwo continuous-wave (CW) optical signals were injected at the signal and LO ports with ...

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“…Photodiodes with a 90 • hybrid for coherent receivers have been studied through various approaches such as the silica-based planar lightwave circuit which has been widely used for passive waveguides, Silicon-photonics and InP-based monolithic integration technologies [5]- [10]. The InP-based monolithic integration of the 90 • hybrid and photodiodes has some advantages over other approaches.…”

Section: Introductionmentioning

confidence: 99%

InP-Based p-i-n-Photodiode Array Integrated With 90<inline-formula><tex-math>$^\circ$</tex-math> </inline-formula> Hybrid Using Butt-Joint Regrowth for Compact 100 Gb/s Coherent Receiver

Yagi

Inoue

Masuyama

et al. 2014

IEEE J. Select. Topics Quantum Electron.

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This paper reports on the performance of an InPbased p-i-n-photodiode array monolithically integrated with a 90 • hybrid consisting of multimode interference structures using the butt-joint regrowth and its application to compact 100 Gb/s coherent receivers. A responsivity including total loss of 8.2 dB in the waveguide was as high as 0.14 A/W, and responsivity imbalance of all channels was less than ±0.5 dB. The wide 3-dB bandwidth of 26 GHz at a low reverse bias voltage of 1.6 V was obtained under high optical input power conditions (photocurrent = 2.5 mA). The stable dark current was achieved in the accelerated aging test (test condition: −5 V at 175 • C) over 2000 h. Finally, the excellent common mode rejection ratio with low loss imbalance of 90 • hybrids (less than −20 dB up to 25 GHz) and demodulation of 128 Gb/s dual polarization quadrature phase-shift keying modulated signals were demonstrated for the compact coherent receiver (package body size: 15 mm × 26 mm × 5.5 mm).

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Ultra-Compact Coherent Receiver Based on Hybrid Integration on Silicon

Cited by 17 publications

References 4 publications

Colorless and Preamplifierless Reception Using an Integrated Si-Photonic Coherent Receiver

Colorless and Preamplifierless Reception Using an Integrated Si-Photonic Coherent Receiver

A small form factor Si-based coherent receiver

InP-Based p-i-n-Photodiode Array Integrated With 90<inline-formula><tex-math>$^\circ$</tex-math> </inline-formula> Hybrid Using Butt-Joint Regrowth for Compact 100 Gb/s Coherent Receiver

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