50Gb/s technical feasibility analysis. Dekun Liu, Huawei Stanley Shuai, Source Sep, 2017

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1 50Gb/s technical feasibility analysis Dekun Liu, Huawei Stanley Shuai, Source Sep, 2017

2 Background In last Berlin meeting, the task force called for contributions on 50G PON solutions analysis. This contribution analyzes the different candidate technologies for 50Gb/s per wavelength, and their advantages and challenges. 2

3 50Gb/s NRZ modulation OLT 50G NRZ O-band EML (SOA) 20km ONU 50G APD/TIA 50G EML frequency response 50G PIN frequency response 50G optics cost curve trend Initial cost isono_3bs_01a_1114.pdf 50G NRZ requires very high bandwidth for optics There are only few 50Gb/s Tx optics with very high cost in industry, and no 50G APD by far. Feasibility of 50G APD is still not clear. The initial cost of 50G will be very high due to lack of application in other industry chain. (Datacenter adopts 25G Baud rate for high bit rates) 3 final cost

4 50Gb/s NRZ dispersion analysis O+ fiber dispersion coefficient 25G/40G EML dispersion penalty comparison in O+ band 1358nm 50G NRZ dispersion (simulation) log 10 (BER) D=2.67 ps/nm km ER=6dB_B2B ER=8dB_B2B ER=10dB_B2B ER=6dB_20km ER=8dB_20km ER=10dB_20km Received Optical Power (dbm) 50G NRZ (50G EML + 50G APD) ER (db) (B2B) BER = E-3/dBm CD penalty* after 20 km ~2.6 ~2.4 ~2.2 * 50G NRZ after 20km can t reach 1E-3 BER 4

5 50G NRZ power budget analysis Solution Tx Power (dbm) Rx Sen. 1e-2 Dispersion penalty 1330nm TDP (db) Power budget gap to 29dB Power budget gap to 33dB 25G NRZ 25G EML +25G APD db 3.8 db 50G NRZ 50G EML +50G APD 50G EML +50G PIN db 9.8dB db 15 db Due to high dispersion penalty and low sensitivity of 50G, there is a big gap to meet the 29dB and 33dB power budget without amplifier. 5

6 50G EDB Source: Tu3C.1 OFC G EDB based on 25G APD Source: Th4H.1 OFC G EDB still requires transmitter with 50G bandwidth, which is in very high cost and far from mature in industry. Dispersion penalty of 50G EDB may be still noticeable in O+ band., which will make the power budget issue more challenging. 6

7 50Gb/s DMT modulation 50G logic +DSP 50G Discrete Multitone Modulation using 10G optics 10G APD BMR 10G EML Tx* Diplexer 50-Gb/s/λ TDM-PON Based on 10G DML and 10G APD Supporting PR10 Link Loss Budget after 20-km Downstream Transmission in the O-band, OFC DMT requires high linearity on the optics and complex DSP, cost is very high After long period debating and comparison, DMT has been beaten by PAM4 in Datacenter. 7

8 25GBaud PAM4 50G PAM-4 MSB {0,1} LSB {0,1} 4-level encoder {0,1,2,3} 25G logic 25G APD BMR 25G EML Tx* Diplexer PAM4 application in Ethernet network for data center PAM4 based on 25G optics, which is widely used in Ethernet network for datacenter, is the most mature technology for 50Gb/s per wavelength in industry 8

9 PAM4 band width requirement on optics PAM4 eye width is not twice of NRZ The symbol duration of PAM4 is twice of that of NRZ The achievable PAM4 eye width is only between 1/2 to 2/3 of the nominal eye width at the TX output PAM4 needs 10~20% extra bandwidth than half of NRZ bandwidth in practical The three vertical eyes are asymmetrical Even for a linear system, top and bottom eyes are not the same as the middle eye Transitions are comprised of symmetrical and nonsymmetrical transitions Impairments impact on the three eye is also different 9

10 PAM4/NRZ sensitivity impact The eye height is 1/3 (4.8dB) of that of NRZ in theory In practice, the eye height degradation is more than 1/3 due to the nonlinearity There will be at least 6dB sensitivity degeneration from NRZ to PAM4 modulation. 10

11 PAM4 Linearity requirement With the same output performance from the DAC, the optical performance will be subject to working conditions (e.g. bias etc) of components. Nonlinearity plays a much bigger role in PAM4; performance depends on the worst eye Nonlinearity starts right at TX output and each active block could add more The larger the signal, the more the nonlinearity becomes Adopting nonsymmetrical data and error slicers can help, but only to a certain extent DSP technology is required to compensate the nonlinearity of optics and decode the PAM4 signal 11

12 PAM4 CDR recovery NRZ signal transition is very simple PAM4 - Three groups of transitions Major transitions: +3-3 Minor transitions: +3 +1, -3-1, +1-1 Intermediate transitions: +3-1, PAM4 needs more time to recover the signal, longer burst overhead for upstream 12

13 50Gb/s PAM4 power budget analysis 50-Gb/s/λ TDM-PON Based on 10G DML and 10G APD Supporting PR10 Link Loss Budget after 20-km Downstream Transmission in the O-band, OFC harstead_3ca_5_0117.pdf 25G NRZ-> 50G PAM4: 5~6dB penalty FEC 1E-3 ->1E-2 : 1.5~2 db Gain Take as a starting point for 50G PAM4 analysis in continuous mode 13

14 50Gb/s PAM4 power budget analysis Downstream 50Gb/s PAM4 still faces a high challenge to meet 29dB power budget The downstream is still possible to meet the power budget with an amplifier in OLT, but the upstream seems very very challenging! upstream Bit rate 50Gb/s 50Gb/s Modulation PAM4 PAM4 Wavelength 1336nm 1270nm Laser type 25G EML 25G DML Launch power +9.8dBm (needs optical amplifier) +12.3dBm(very difficult) Distance 20km 20km TDP 1.5dB 2.5 db mode) Power budget 29dB 29dB 14

15 50G wavelength plan example Option 1: WDM coexistence with XG(S)-PON basic wavelength set 50G UP 50G DN Option 2: WDM coexistence with XG(S)-PON optional wavelength set and GPON 50G UP 50G DN

16 Summary Several solutions for 50Gb/s per wavelength are analyzed, 50Gb/s per wavelength is a possible technical solution which could be used for PON application. 50G NRZ modulation suffers high dispersion penalty even in O-band, very high initial cost. PAM4 based on existing 25G optics seems one most promising technology for 50Gb/s which is adopted by Ethernet standard for datacenter, but more detail study are still needed for PON application : Such as optics linearity requirement, burst mode recovery time Power budget issue will be the key challenge for 50Gb/s per wavelength, especially for the upstream power budget. 16

17 Thank you

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