A Review of Self-Coherent Optical Transceivers: Fundamental Issues, Recent Advances, and Research Directions
Abstract
:1. Introduction
1.1. Review of Related Works
1.2. Contributions
- (i)
- An extensive analysis of the associated short-reach system features and enabling technologies that demand novel transceiver architectures and DSP techniques are presented. In this context, an overview of high-speed short-reach systems regarding their classifications, advanced optoelectronic devices, potential modulation formats, requirements, and challenges are well considered;
- (ii)
- A comprehensive tutorial on the optical transceiver architectures and their classifications based on the DoF is presented. Furthermore, research efforts towards simplified and cost-effective architectures are well discussed. Furthermore, the requirements for a simplified transceiver architectural evolution from 1D to 4D and the related technical challenges are discussed with potential solutions being proffered;
- (iii)
- In addition to a comparison among different detection schemes, we present a detailed SCOH system classification based on the detection schemes, as well as the adopted polarization and modulation schemes at the transmitter. Furthermore, we give a comprehensive discussion of their relative advantages compared to the conventional IM-DD and COH systems. Furthermore, their respective technical limitations are considered, and potential solutions are proffered;
- (iv)
- Moreover, besides the presented comprehensive studies on the carrier and optical SSB signal generation, a distinct classification of the schemes based on the adopted generation approaches is provided. Furthermore, the related features of the schemes are extensively discussed considering the required frequency gap, associated CSPR, achievable SE, required optical filter, and hardware complexity;
- (v)
- Furthermore, apart from an in-depth discussion on the SSBN mitigation concepts, the SSBN mitigation/receiver-based digital linearization schemes for the direct-detection-based systems are clearly presented with the main focus on the performance of transmitter-based EDC (Tx-EDC) and receiver-based EDC (Rx-EDC) systems;
- (vi)
- Moreover, the KK algorithm is comprehensively presented, and due attention is paid to the related effects of different factors such as chromatic dispersion, the optoelectronic frontend, and IQ imbalance on the KK scheme;
- (vii)
- A comprehensive tutorial on various approaches by which the conventional KK system challenges regarding the spectral broadening, high CSPR value, and associated additional sensitivity penalty can be attended to considering factors such as the system complexity and latency is presented;
- (viii)
- Apart from different potential systems for 100 G and beyond applications that have been considered in the other review papers, we also present different SCOH-based experimental demonstrations that are capable of supporting high-speed short- and medium-reach use cases; Furthermore, an overview of recent research and development efforts on the enabling technologies to support 100 Gb/s and beyond (Tb/s) per wavelength is presented;
- (ix)
- Additionally, we address further research directions and future optical network considerations for performance enhancement. In this context, advancement towards high-baud-rate transmission is presented, and the photonic integrated circuit (PIC) exploitation for low-cost, low-power consumption, and low-footprint schemes is comprehensively discussed. We highlight the need for tremendous synergy between photonic technologies and the software-defined networking (SDN) programmability to facilitate the functionalities of flexible transceiver systems that will be able to support the content-aware future transmission systems. An in-depth discussion on how the synergy can facilitate advanced functionalities and ensure full exploitation of photonic technology’s potentialities and available resources is presented.
1.3. Organization
2. Beyond 100 Gb/S Era
2.1. The Need for per Wavelength AIR Enhancement
2.2. Why the Need for a Simplified System?
2.3. Ethernet Standards and Optical Transceiver Applications
2.3.1. Optical Transceivers and the Related Ethernet Standards
2.3.2. Ethernet Standards and Optical Transceiver Applications
3. Short-Reach Systems Classification and Enabling Technologies
3.1. Short-Reach Systems’ Overview and Classification
3.1.1. Intra-Data Center or Server-to-Server Links
3.1.2. Inter-Data Center Links
3.1.3. Extended Reach Inter-Data Center, Access, and Metro Links
3.2. Data Center Network Requirements and Challenges
3.2.1. Resilience
3.2.2. Energy Consumption
3.2.3. Traffic
3.2.4. Scalability
3.2.5. Latency
3.3. Enabling Technologies for Short-Reach System
3.3.1. Potential Modulation Formats
Pulse Amplitude Modulation
Carrierless Amplitude and Phase Modulation
Discrete Multitone Modulation
Multicarrier Entropy Loading
Optical Single-Sideband Modulation
3.3.2. Advanced Optoelectronic Devices for High-Speed DCIs
Vertical-Cavity Surface-Emitting Lasers
Directly Modulated Laser
Mach–Zehnder Modulator
Double-Sided Electro-Absorption Modulated Lasers
Electro-Absorption Modulator Integrated with a Distributed Feedback Laser
Semiconductor Optical Amplifier-PIN/Transimpedance Amplifier Receiver
High-Bandwidth APD Receiver
Optoelectronic Oscillator
3.3.3. Optoelectronic Devices and Modulation Formats’ Applications in the 5G Network
3.3.4. Requirements and Challenges
Cost
Form Factor
Other Challenges of Short-Reach Systems
4. SSB Signal Generation and SSBN Mitigation Techniques
4.1. Carrier and SSB Signal-Generation Techniques
4.1.1. Bias-Induced Carrier Generation Scheme
SSB Subcarrier Modulation with the IQ Modulator
SSB Subcarrier Modulation with the DDMZM
4.1.2. Carrier-Assisted Generation Scheme
Optical Carrier-Assisted SSB
Virtual Carrier-Assisted SSB
4.2. Optical SSBN Mitigation
4.2.1. Optical SSBN Mitigation Concepts
4.2.2. Optical SSBN Mitigation Approaches
Single-Stage Linearization Filter Approach
Two-Stage Linearization Filter Approach
Iterative Linearization Filter Approach
SSBN Estimation and Cancellation Approach
Kramers–Kronig Approach
5. Kramers–Kronig Detection Scheme
5.1. Principles of the KK Algorithm
5.1.1. Conventional KK Algorithm
5.1.2. Modified KK Algorithms
5.2. Related Impact on the KK Scheme
5.2.1. Opto-Electronic Frontend
5.2.2. Laser-Related Effects
5.2.3. Fiber Dispersion
5.2.4. IQ Imbalance
6. Transceiver Architectures’ Classification and Basic Concepts
6.1. 1D-Based Architectures
IM-DD
IG + Offset C/DD
IQ + C/DD-KK or DD-IC
6.2. 2D-Based Architectures
6.2.1. DP-IM/DD DP-IM or the Stokes Vector Receiver
6.2.2. PolMux + Carrier (C)/Stokes Vector Receiver
6.3. 3D-Based Architectures
6.4. 4D-Based Architectures
7. Towards a Simplified Optical Transceiver
7.1. Full Coherent Optical System
7.1.1. Optical Coherent Receiver Configurations
7.1.2. Optical Coherent Detection Principles
Heterodyne Detection
Homodyne Detection
Phase Diversity
7.2. Simplified Coherent Optical System
7.3. SCOH System Classification
7.3.1. Direct-Detection-Based Single-Ended photodetector
7.3.2. Direct-Detection-Based Balanced Receiver
7.4. Relative Advantages of SCOH Schemes
- There is a significant simplification in the optical hardware, mainly for the optical frontend of the receiver;
- The dual-polarized receiver is highly important in the COH system to enable 2 × 2 MIMO polarization recovery. On the other hand, single-polarization is one of the suitable options in the SCOH for the polarization alignment for the signal and the carrier at the transmitter;
- The required DSP by the receiver is simplified (e.g., no need for the execution of sophisticated carrier recovery);
- The SCOH can be implemented uncooled, while this is challenging in the COH system. The cooling circuitry makes the COH system power-consuming and bulky;
- As an ultimate consequence of the previous itemized advantages, the SCOH-based scheme provides a cost-effective solution compared with the full COH scheme for short- and medium-reach applications.
- The received signal in the SCOH is a linear replica of the transmitted one based on the linear channel that facilitates optical field modulation and detection;
- The copropagated carrier facilitates phase diversity realization and helps increase the receiver sensitivity;
- Since the carrier and the signal are generated through the same laser source, there is considerable assurance that the phases between them are coherent with each other at the transmitter. Consequently, the system’s vulnerability to the laser phase noise is inherently mitigated in the SCOH system;
- A single-carrier IM-DD system is susceptible to ISI and has a transmission distance limitation. These issues can be addressed with the implementation of the SCOH system;
- The SCOH offers a 2D direct detection receiver that helps expand the optical spectrum efficiency. Furthermore, the RF bandwidth utilization ratio at the receiver can reach up to 100% with the DSB modulation;
- The supported optical field modulation in the SCOH system facilitates the DWDM and superchannel implementation.
8. SCOH Transceiver Structures
8.1. Optical Field Representation
8.1.1. Jones Space Representation
8.1.2. Stokes Space Representation
9. Stokes Space Polarization and Field Recovery Principle
9.1. Polarization Recovery Techniques in the Direct Detection Stokes Vector Receiver
9.1.1. Adaptive MIMO Equalization
9.1.2. Training-Assisted Polarization Characterization
9.1.3. Stoke Space Signal-Distribution-Based Polarization Demultiplexing
9.1.4. Analog Polarization Identification
9.2. Stokes Space Field Recovery
9.2.1. 1D Direct Detection-Based Field Recovery
9.2.2. 2D Direct-Detection-Based Field Recovery
Self-Coherent Stokes Space Modulation
Polarization Division Multiplexing Single-Sideband Modulations
9.2.3. 3D Direct-Detection-Based Field Recovery
- The intensity can be recovered, and subsequently, the field X can be retrieved from the intensity information using 1D field recovery;
- Furthermore, the field can then be retrieved.
- The polarization recovery demands field recovery in the Jones space;
- The gapless SSB-FR implementation demands a specified CSPR threshold;
- Furthermore, in a condition whereby the polarization states are arbitrary, it will be highly challenging to guarantee the CSPR beyond the threshold for the entire MIMO dimensions without the polarization recovery.
10. Experimental Implementations
11. Further Research Directions and Future Considerations
11.1. Advancement towards High-Baud-Rate Transmission
11.2. Performance Optimization Issues of Short-Reach Transceivers
11.3. Energy-Efficient Interconnection
11.4. Photonic Integrated Circuit Exploitation
11.5. Software-Defined Optical Transmission
11.5.1. Software-Defined Optical Transceivers
11.5.2. Sliceable Transceivers
11.6. Software-Defined Modulation
12. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Speed | Nomenclature | Standard | Medium | Form Factor | Interface | Reach |
---|---|---|---|---|---|---|
10 GbE (10 Gb/s) | 10 GBASE-SR | 802.3ae-2002 (CL49/52) | Multimode Fiber (@850 nm) | SFP+ XENPAK X2 XPAK XFP | LC Duplex SC Duplex | OM1—33 m OM2—82 m OM3—300 m OM4—400 m |
10 GBASE-LR | Single-mode Fiber (@1310 nm) | SFP+ XENPAK X2 XPAK XFP | LC Duplex SC Duplex | OS2—10 km | ||
10 GBASE-ER | Single-mode Fiber (@1550 nm) | SFP+ XENPAK X2 XFP | LC Duplex SC Duplex | OS2—40 km | ||
25 GbE (25 Gb/s) | 25 GBASE-SR | 802.3by-2016 (CL112) | Multi-mode Fiber (@850 nm) | SFP28 | LC Duplex | OM3—70 m OM4—100 m |
25 GBASE-LR | 802.3cc-2017 (CL114) | Single-mode Fiber (@1310 nm) | OS2—10 km | |||
25 GBASE-ER | 802.3cc-2017 (CL114) | Single-mode Fiber (@1550 nm) | OS2—40 km | |||
40 GbE (40 Gb/s) | 40 GBASE-SR4 | 802.3ba-2010 (CL82/86) | Multimode Fiber (@850 nm) | CFP QSFP+ | MPO | OM3—100 m OM4—150 m |
40 GBASE-LR4 | 802.3ba-2010 (CL82/87) | Single-mode Fiber (WDM) | CFP QSFP+ | LC Duplex | OS2—10 km | |
40 GBASE-ER4 | 802.3bm-2015 (CL82/87) | Single-mode Fiber (WDM) | QSFP+ | LC Duplex | OS2—40 km | |
100 GbE (100 Gb/s) | 100 GBASE-SR10 | 802.3ba-2010 (CL82/86) | Multimode Fiber (@850 nm) | CXP CFP CFP2 CFP4 CPAK | MPO (2 × 12) | OM3—100 m OM4—150 m |
100 GBASE-PSM4 | Proprietary (non-IEEE) (January 2014) | Single-mode Fiber (@1310 nm) | QSFP28 CFP4 | MPO 12 | OS2—500 m | |
100 GBASE-CWDM4 | Proprietary (non-IEEE) (March 2014) | Single-mode Fiber (WDM) | QSFP28 CFP2 CFP4 | LC Duplex | OS2—2 km | |
100 GBASE-SR2-BiDi (Bi-directional) | proprietary (non-IEEE) | Multimode Fiber (@850 nm @900 nm) (WDM) | QSFP28 | LC Duplex | OM3—70 m OM4—100 m | |
Proprietary (non-IEEE) (June 2016) | Wide-Band Multimode Fiber (SWDM) | SFP | LC Duplex | OM5—150 m | ||
100 GBASE-LR4 | 802.3ba-2010 (CL88) | Single-mode Fiber (WDM) | QSFP28 CFP CFP2 CFP4 CPAK | LC Duplex SC Duplex | OS2—10 km | |
100 GBASE-SR4 | 802.3bm-2015 (CL95) | Multimode Fiber (@850 nm) | QSFP28 CFP2 CFP4 CPAK | MPO 12 | OM3—70 m OM4—100 m | |
100 GBASE-ER4 | 802.3ba-2010 (CL88) | Single-mode Fiber (WDM) | QSFP28 CFP CFP2 | LC Duplex SC Duplex | OS2—40 km | |
400 GbE (400 Gb/s) | 400 GBASE-SR8 | 802.3cm | Multimode Fiber (@850 nm) | OSFP QSFP-DD | MPO (16) MPO (2 × 12) | OM3—70 m OM4—100 m OM5—100 m |
400 GBASE-DR4 | 802.3bs | Single-mode Fiber (WDM) | CFP8 OSFP QSFP-DD | MPO 12 SN Connector | OS2—500 m | |
400 GBASE-FR4 | 802.3cu | Single-mode Fiber (WDM) | CFP8 OSFP QSFP-DD | LC Duplex | OS2—2 km | |
400 GBASE-2FR4 (2 × 200 G-FR4) | 802.3bs | Single-mode Fiber (WDM) | OSFP QSFP-DD | CS Connector | OS2—2 km |
Range | Power Consumption | Temperature Range | Applications | Standard | |
---|---|---|---|---|---|
25 G/100 G transceivers for 5G mobile FH networks | |||||
25 GE/eCPRI SFP28 | 10 km | <1.5 W | I-Temp | 25 GBASE-LR Ethernet CPRI Option 10 | SFP28 MSA IEEE 802.3by 25 GBASE-LR |
1.8 W | CPRI Option 10 25 G Ethernet | ||||
<3.5 W | CPRI Option 10 | SFP28 MSA, 25 G Ethernet CPRI/eCPRI specifications | |||
300 m | <1 W | 5G eCPRI SFP28 SR 25 GBASE-SR SFP28 25 G Ethernet | SFP28 MSA IEEE 802.3by 25 GBASE-SR | ||
100 m | 5G eCPRI SFP28 SR | ||||
100 GE/eCPRI QSFP28 4WDM-10 | 10 km | <4 W | Data Center Interconnect 100 G 4WDM-10 10 km reach 100 G CWDM4 applications InfiniBand EDR interconnects Enterprise networking | QSFP28 MSA 4WDM-10 MSA InfiniBand EDR | |
100 GE/eCPRI QSFP28 | 100 m | <2 W | 5G FH Network | QSFP28 MSA IEEE 802.3bm 100 GBASE-SR4 | |
100 G/200 G/400 G transceivers for 5G midhaul/backhaul networks | |||||
100 G QSFP28 4WDM-10 | 10 km | <4 W | I-Temp | Data Center Interconnect 100 G 4WDM-10 10 km reach 100 G CWDM4 applications InfiniBand EDR interconnects Enterprise networking | QSFP28 MSA 4WDM-10 MSA InfiniBand EDR |
100 G QSFP28 LR4 | <3.5W | C-Temp | Data Center Network Optical Transport Network (OTN) | QSFP28 MSA IEEE 802.3ba 100 GBASE-LR4 | |
100 G QSFP28 ELR4 | 20 km | IEEE 802.3ba 100 GBASE-LR4 OTN OTU4 and 100 GE | |||
100 GE/OTU4 QSFP28 ER4 Lite | 40 km | <3.8 W | IEEE 802.3ba 100 GBASE-ER4 links Client-side 100 G interconnections OTN OTU4 | QSFP28 MSA IEEE 802.3ba 100 GBASE-ER4 Lite OTN OTU4 | |
200 G QSFP56 FR4 | 2 km | <7.0 W | IEEE 802.3bs 200 GBASE-FR4 Ethernet 5G Backhaul Data center | QSFP56 MSA IEEE 802.3bs 200 GBASE-FR4 | |
200 G QSFP56 LR4 | 10 km | <7.5 W | IEEE 802.3bs 200 GBASE-LR4 Ethernet Data center | QSFP56 MSA IEEE 802.3bs 200 GBASE-LR4 | |
400 G-QSFPDD-ER8 | 40 km | <14 W | 400 GBASE Ethernet Data center Telecom | QSFP-DD MSA | |
400 G-QSFPDD-LR8 | 10 km | <14 W | Data center 400 G Ethernet | ||
400 G-QSFPDD-SR8 | 100 m | <10 W | |||
QDD-400 G-DR4-S | 500 m | <10 W | Data Center 400 G Ethernet 400 G to 100 G Breakout | Compliant to QSFP-DD MSA Common Management Specification (CMIS) Rev 4.0 IEEE Std 802.3-2018 IEEE Standard for Ethernet IEEE802.3bs 400 GAUI-8 Annex 120E | |
QDD-400 G-FR4-S | 2 km | <12 W | Data Center 400 G Ethernet | QSFP-DD MSA |
Data Rate | Form Type | Transmission Distance | Wavelength | Modulation Format | Transmitter and Receiver |
---|---|---|---|---|---|
25 G/100 G transceivers for 5G mobile FH networks | |||||
25 Gbit/s | SFP28 | 70∼100 m | 850 nm | NRZ | VCSEL + PIN |
300 m | 1310 nm | FP/DFB + PIN | |||
10 km | DFB + PIN | ||||
SFP28 BiDi | 10/15/20 km | 1270/1330 nm | NRZ/PAM4 | DFB + PIN/APD | |
SFP28 | 10 km | CWDM | NRZ | DFB + PIN | |
Tunable SFP28 | 10/20 km | DWDM | EML + PIN | ||
100 Gbit/s | QSFP28 | 70∼100 m | 850 nm | VCSELs + PINs | |
10 km | 4WDM-10 | DFBs + PINs | |||
1310 nm | PAM4/DMT | EML + PIN | |||
QSFP28 BiDi | CWDM4 | NRZ | DFBs + PINs | ||
25 G/50 G/100 G/200 G/400 G transceivers for 5G midhaul/backhaul networks | |||||
25 Gbit/s | SFP28 | 40 km | 1310 nm | NRZ | EML + APD |
50 Gbit/s | QSFP28/SFP56 | 10 km | PAM4 | EML/DFB + PIN | |
QSFP28 BiDi | 1270/1330 nm | EML/DFB + PIN | |||
QSFP28/SFP56 | 40 km | 1330 nm | EML + APD | ||
QSFP28 BiDi | 1295.56/1309.14 nm | EML + APD | |||
100 Gbit/s | QSFP28 | 10 km | CWDM/LWDM | NRZ | DFBs/EMLs + PINs |
40 km | LWDM | EMLs + APDs | |||
10/20 km | DWDM | PAM4/DMT | EMLs + PINs | ||
100/200/400 Gbit/s | CFP2-DCO | 80∼120 km | PM QPSK/8-QAM/16-QAM | IC-TROSA + ITLA | |
200/400 Gbit/s | OSFP/QSFP-DD | 2/10 km | LWDM | PAM4 | EMLs + PINs |
Generation Classification | Adopted Technique | Modulator Bias Point | Transmitted Signal | Approach | Advantages | Disadvantages | Reference |
---|---|---|---|---|---|---|---|
Bias-induced carrier-generation scheme | SSB subcarrier modulation with | off null | SSB |
|
| [53,54,55,56] | |
SSB subcarrier modulation with DDMZM | - | SSB | DDMZM |
|
| [54,55,56] | |
Carrier-assisted generation scheme | Optical carrier-assisted SSB | null | DSB | optical carrier |
|
| [54,55,56,109] |
Virtual carrier-assisted SSB | null | DSB | digital carrier |
|
| [53,54,55,56] |
Technique | Advantages | Disadvantages | Reference |
---|---|---|---|
Single-Stage Linearization Filter |
|
| [22,29,31] |
Two-Stage Linearization Filter |
|
| [29] |
Iterative Linearization Filter |
|
| [29,50,57,58,118] |
SSBN Estimation and Cancellation |
|
| [29,59] |
Kramers–Kronig |
|
| [29,45,46,50,55] |
Reference | Related Effect | Adopted Technique | Advantages | Tradeoff |
---|---|---|---|---|
Digital upsampling | ||||
[18] |
| DSP algorithm without digital upsampling |
|
|
[21] | modified Hilbert filter in the digital domain |
|
| |
[45,46] | approximated functions |
|
| |
[44] | approximated functions and exponential function elimination |
|
| |
[43] | DSP algorithm without digital upsampling |
|
| |
High CSPR | ||||
[49] |
| flexible adaptive dispersion compensation |
|
|
[50] | hardware SSBN cancellation |
|
| |
[51] | enhanced SSBN mitigation algorithm |
|
| |
[52] | employs an exponential operation |
|
| |
[48] | employs an exponential operation |
|
|
Technique | IM/DD | / DD-KK or DD-IC | DP-IM/ >DD DP-IM or SVR | PolMux / SVR | offsetC/ DD | DP-IM-IPM/ SVR | PolMux- -IM/ SVR | DP-COH | RLOD | Reference |
---|---|---|---|---|---|---|---|---|---|---|
Tx scheme | IM | DP-IM | PolMux | DP-IM- IPM | PolMux- -IM | DP | [12,13,14,33,34,37,129] | |||
Rx scheme | DD | DD-KK DD-IC | DD DP-IM SVR | SVR | DD | SVR | COH | [12,13,14,33,34,37,129] | ||
DoF | 1 | 2 | 3 | 4 | [12,13,14,38,129,131] | |||||
Modulator | 1 IM | 1 1 OFS | 2 IM | 2 | 1 1 OFS | 2 IM 1 PM | 1 IM 1 | 2 | [12,13,129] | |
OSE relative to DP-COH (%) | 25 | 50 | 25 | 75 | 100 | [12,13,14,129] | ||||
Detector | 1D PD | 3D SVR | 1D PD | 3D SVR | 4D Co-Rx | [12,13,129] | ||||
Min. Rx RF bandwidth at Gbaud | R | 2R | [12,13,14,129] | |||||||
Supports digital CD at Rx | No | Yes | No | Yes | No | Yes | [7,14,37,129] | |||
Typical Rx DSP |
|
|
|
|
|
|
| [7,14,21,37,44,45,46,129] | ||
Cost | [21,37,38,44,45,129,131] | |||||||||
Complexity | [7,14,21,37,44,45] | |||||||||
Data rate | [12,13,14,21,131] | |||||||||
Distance | [12,21,34,38] |
Detection Schemes | ||||
---|---|---|---|---|
Feature | Coherent | Self-Coherent | IM-DD | Reference |
Maximum DoFs per polarization | 2 | 2 | 1 | [12,13,47,139] |
Adopted method | Heterodyne or homodyne | Heterodyne or homodyne | Direct | [10,11,12,13,107] |
Modulation parameters | I and Q or amplitude and phase | I and Q or amplitude and phase | Intensity | [10,11,12,13,107] |
Polarization sensitivity | ⬤ | ◐ | ◯ | [10,11,12,13,107] |
Carrier phase sensitivity | ⬤ | ◐ | ◯ | [10,11,12,107] |
Electrical filter usage for selecting the WDM channel | ⬤ | ◐ | ◯ | [11,13,47,107,139] |
CD is a linear distortion (offers more effective CD) | ⬤ | ◐ | ◯ | [11,12,13,47,107,139] |
Requirement of LO laser at Rx | ⬤ | ◐ | ◯ | [12,13,47,107,139] |
Requirement of polarization control or diversity at Rx | ⬤ | ◐ | ◯ | [11,12,13,47,139] |
DSP complexity | ⬤ | ◐ | ◯ | [11,12,13,107] |
Implementation cost | ⬤ | ◐ | ◯ | [11,12,13,107] |
Footprint | ⬤ | ◐ | ◯ | [11,12,13,107] |
Power consumption | ⬤ | ◐ | ◯ | [11,12,13,107] |
Spectral efficiency | ⬤ | ◐ | ◯ | [11,12,13,107] |
Reach | ⬤ | ◐ | ◯ | [11,12,13,107] |
Structures | Exploited DoFs (Highlighted) | Features | Reference |
---|---|---|---|
Dual-Polarized IM |
| [26,63] | |
Dual-Polarized IM-PM |
| [26,144] | |
Single-Polarization Complex Modulation |
| [26,145] | |
Dual-Polarized Complex Modulation |
| [26,41] |
DoF | Scheme | IQM | OFS | Rx | CSPR (dB) | Baud- Rate (Gbaud) | OSE | ESE | Merit | Demerit | Reference |
---|---|---|---|---|---|---|---|---|---|---|---|
1D | DD | 1 | 1 | 1D PD | 10 | 25 | 4 | 4 |
|
| [11,12,107] |
2D | SCOH SSM | 1 | - | 3D SVR | 0 | 25 | 4 | 8 |
|
| [9,11] |
3D | PDM-SSB | 2 | 1 | 3D SVR | 10 | 12.5 | 8 | 8 |
|
| |
CA-DP SV-DD | 3 | 2 | 3D SVR | 10 | 8.3 | 6 | 12 |
|
| [11,41] | |
SS-FM | 3 | 2 | 3D SVR | 10 | 16.7 | 6 | 12 |
|
| [8,11,13] | |
4D | PDM DSB | 2 | - | 4D Co-Rx | - | 12.5 | 8 | 16 |
|
| [11,13,107] |
RLOD | 2 | (·) | 4D Co-Rx | - | 12.5 | 8 | 16 |
|
| [129,130] |
Experiment | Distance (km) | Data Rate Gb/s | Scheme Employed | QAM Modulation | FFT Size | Subcarriers | Cyclic Prefix (CP) | Symbol Length | AWG/DAC Operation (GSa/s) | Pre-FEC (20%) ESE (bits/s/Hz) | Post-FEC ESE (Bits/s/Hz) | RTO Rate (GSa/s) | Net/Aggregate OSE/ISD (b/s/Hz) | CSPR (dB) | Optimum Launch Power (dBm) | Reference |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Stokes Vector Direct-Detection (SV-DD)-Based Schemes | ||||||||||||||||
1 | 160 | 160 | OFDM | 16 | 4096 | 2184 | 128 | 384 | 25 | 7.76 | 6.46 | 50 | - | 0 | 4 | |
2 | 160 | 80/160 | OFDM | 64/16 | 4096 | 2184 | 128 | 384 | 25 | 11.64/7.76 | 9.71/6.46 | 50 | - | 0 | 0-4 | [24] |
3 | 160 | 80 | OFDM | 64 | 4096 | 2184 | 128 | 384 | 25 | 11.64 | 9.71 | 50 | - | 0 | 4 | [11] |
4 | 160 | 40/20 | PDM | 16/4 | - | - | - | - | 10 | - | - | 50 | - | 0 | - | [152] |
5 | 160 | 80 | OFDM | 64 | 4096 | 2184 | 128 | 384 | 25 | 11.64 | 9.71 | 50 | - | 0 | 4 | [8] |
6 | 160 | 62.5 | OFDM | 32 | 4096 | 2184 | 128 | 384 | 25 | - | 9.34 | 50 | - | 0 | 4 | [39] |
7 | (·) | (·) | (·) | - | - | - | - | - | 64 | - | - | 80 | - | (·) | (·) | [145] |
8 | 480 | 1000 | OFDM | 16 | 4096 | 2184 | 128 | 384 | 10 | 7.76 | 6.47 | 50 | - | 0 | 8 | [153] |
9 | 100 | 128 | - | 16 | - | - | - | - | 88 | - | - | 40 | - | - | 6 | [154] |
10 | 80 | 480 | PDM | 16 | - | - | - | - | 88 | - | - | 160 | - | - | 8 | [155] |
11 | (·) | (·) | PDM-PAM-4 | - | - | - | - | - | 70 | - | - | 80 | - | - | - | [63] |
12 | 80 | 112 | 16 | - | - | - | - | 80 | - | - | 80 | - | 0 | - | [151] | |
13 | 20 | 280/350 | DP-x a | - | - | - | - | - | 70 | - | - | 80 | - | - | - | [128] |
14 | 0.5 | 504 | DP-x a | - | - | - | - | - | 84 | - | - | 160 | - | - | - | [144] |
15 | 80 | 480 | POL-x b | - | 800 | 600 | - | - | 80 | - | - | 160 | - | 9 | 8 | [13] |
16 | 320/80 | 280/336 | 16-QAM-PAM2/4 | - | 800 | 600 | - | - | 80 | - | - | 160 | - | - | - | [26] |
17 | 1 | 200 | PDM-DMT | 16 | 512 | 320 | - | - | 80 | - | - | - | - | - | - | [27] |
18 | 10 | 320 | (·) | - | - | - | - | - | 64 | - | - | 80 | - | - | - | [25] |
19 | 20 | 360 | (·) | - | - | - | - | - | 64 | - | - | 80 | - | - | - | [25] |
20 | 160 | 192 | OFDM | 16 | 1024 | 512 | 64 | - | 64 | - | - | 80 | - | - | 3 | [41] |
21 | 20 | 176 | OFDM | 64 | 1024 | 512 | 16 | 500 | 88 | - | - | 80 | - | - | - | [156] |
22 | 260 | 446 | - | 64 | - | - | - | - | - | 16.5 | 13.9 | 80 | - | 6.3 | 7 | [20] |
23 | 100 | (·) | OFDM | 64 | - | - | - | - | - | - | - | 256 | - | 7.3 | 11 | [131] |
24 | (5/40) | 600/400 | - | 64/16 | - | - | - | - | - | - | - | - | - | - | - | [129] |
Kramers–Kronig (KK)-Based Schemes | ||||||||||||||||
25 | 100 | 240 | WDM-PDM | 32 | - | - | - | - | 88 | - | - | 62 | 5.3 | 9 | 2 | [19] |
26 | 125 | 59 | DMT | 16 | 512 | 128 | - | - | 60 | - | - | 80 | 3.9 | 8 | 9 | [28] |
27 | 100 | 220/240 e | DMT/WDM | 16/32 | 1024 | 768 | - | - | - | - | - | 63 | - | 7.5/9 | 9/8 | [19] |
28 | 240 | 112 | WDM | 16 | - | - | - | - | 92 | - | - | 63 | 2.8/3.18 | 11 | 2.5 | [22] |
29 | 80 | 100 | SSB-DMT | 32 | 512 | 224 | - | 72 | - | - | 160 | - | - | 9 | [31] | |
30 | 300 | 267 | - | 16 | - | - | - | 72 | - | - | 256 | - | (·) | (·) | [21] | |
31 | 7.9 | (·) | SDM-WDM | (·) | - | - | - | 64 | - | - | 160 | 184.42 | 8 | 8 | [157] | |
32 | (·) | (·) | - | (·) | - | - | - | 64 | - | - | 200 | - | 10.5 | 15 | [158] | |
33 | 80 | 112 | OFDM | 16 | 1024 | 448 | 576 | - | 64 | - | - | 80 | - | 10 | 7 | [46] |
34 | 100 | 218 | DMT j | 16 | 1024 | 768 | - | - | 80 | - | - | 63 | - | 7.5 | 9 | [19] |
35 | (·) | (·) | WDM | 16 | - | - | - | - | 92 | - | - | 160 | 5.71 | 12 | 1/6 | [109] |
36 | 80 | 168 | WDM | 64 | - | - | - | - | 92 | - | - | 80 | 4.61/4.54 | 12 | 2 | [61] |
37 | 960 | 112 | PAM4 | 16 | - | - | - | - | 65 | - | - | 160 | - | 12 | 5 | [159] |
38 | 160 | 80 | OFDM | - | 4096 | 2176 | 136 | - | 80 | - | - | 160 | - | 8 | - | [160] |
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Alimi, I.; Patel, R.; Silva, N.; Sun, C.; Ji, H.; Shieh, W.; Pinto, A.; Muga, N. A Review of Self-Coherent Optical Transceivers: Fundamental Issues, Recent Advances, and Research Directions. Appl. Sci. 2021, 11, 7554. https://doi.org/10.3390/app11167554
Alimi I, Patel R, Silva N, Sun C, Ji H, Shieh W, Pinto A, Muga N. A Review of Self-Coherent Optical Transceivers: Fundamental Issues, Recent Advances, and Research Directions. Applied Sciences. 2021; 11(16):7554. https://doi.org/10.3390/app11167554
Chicago/Turabian StyleAlimi, Isiaka, Romil Patel, Nuno Silva, Chuanbowen Sun, Honglin Ji, William Shieh, Armando Pinto, and Nelson Muga. 2021. "A Review of Self-Coherent Optical Transceivers: Fundamental Issues, Recent Advances, and Research Directions" Applied Sciences 11, no. 16: 7554. https://doi.org/10.3390/app11167554
APA StyleAlimi, I., Patel, R., Silva, N., Sun, C., Ji, H., Shieh, W., Pinto, A., & Muga, N. (2021). A Review of Self-Coherent Optical Transceivers: Fundamental Issues, Recent Advances, and Research Directions. Applied Sciences, 11(16), 7554. https://doi.org/10.3390/app11167554