Wavelength plan proposal intermediate report
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Wavelength Plan Proposal - Intermediate Report -. ver. 1.1. SMF cut-off problem. Report at March meeting. Conclusion in March meeting presentation.

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Wavelength plan proposal intermediate report

Wavelength Plan Proposal- Intermediate Report -

ver. 1.1


Wavelength plan proposal intermediate report

SMF cut-off problem

Report at March meeting

Conclusion in March meeting presentation

By reviewing the proposals in IEEE meetings and systematically narrowing the 10GE-PON system configuration achieving coexistence with current systems, we found that

- US : TDM-based overlay is preferable

- DS : WDM-based overly using L-band is the only solution.

Wavelength allocation

Candidate for 10GE-PON : L-band

WDM filter problem of US/DS separation

GE-PON (US)

GE-PON (DS)

Video

OTDR

l

1.66

1.61

1.46

1.41

1.56

1.26

1.51

1.21

1.36

1.31

Additional filters may be required to 1G-ONU and V-ONU.

Action Item

  • Wavelength Plan Proposal


Wavelength plan proposal intermediate report

Configuration of optical filters in ONUs (1)

Several types of optical filter configuration in ONUs are considered for coexistence. In general, they are commonly categorized into:

(Case-1) combination of several WDM filters, as shown in 3av_0703_hajduczenia_2.pdf,

(Case-2) combination of WDM filters and optical band-pass filters.

(Case-1)

(Case-2)

SWPF1

SWPF2

SWPF

LD

LD

LWPF

BPF

1260~1360 1G/10G Up

1480~1500 1G Down

1550~1560 Video

1574~1580 10G Down

PD

PD

1625~1650 OTDR


Wavelength plan proposal intermediate report

SWPF-1

SWPF-1

Configuration of optical filters in ONUs (2)

(Case-1)

(Case-2)

Receiver side

Receiver side

Pass band

Pass band

10G-PON

(DS)

10G-PON

(DS)

1G&10G-PON (US)

GE-PON

(DS)

1G&10G-PON (US)

GE-PON

(DS)

Video

Video

SWPF-1

BPF

LWPF-1

1.26

1.26

1.36

1.36

l

l

1.55

1.55

1.48

1.56

1.48

1.56

1.50

1.50

SWPF-1

SWPF-1

Transmitter side

Transmitter side

Pass band

Pass band

10G-PON

(DS)

10G-PON

(DS)

Video

1G&10G-PON (US)

GE-PON

(DS)

1G&10G-PON (US)

GE-PON

(DS)

Video

SWPF-1

1.26

1.26

1.36

1.36

l

l

1.55

1.55

1.48

1.56

1.48

1.56

1.50

1.50

The cost of the ONU is mainly dominated by the optical transceiver components. The insertion loss should be a decisive factor when designing optical filters to relax the optical transceiver specifications. From this perspective, the feasibility of the case-2 filter was considered – a smaller number of filters is preferable in terms of lower insertion loss.


Wavelength plan proposal intermediate report

BPF specification (1)

In studying the feasibility of the case2-type ONU blocking filters, we assumed the following conditions:

(a) No additional filter to already deployed 1G-ONU and V-ONU,

(b) Insertion loss : < 1 dB,

(c) [email protected] nm : > 35 dB,

(d) No restriction on the module type,

(e) ONU embedded filter (preferable).

Isolation: 35 dB

Signal band:

Video

10G-PON (DS)

l

1560

1550

What is the required guard band size ?

System vendors investigated the required guard band for blocking video signal.


Wavelength plan proposal intermediate report

BPF specification (2)

Shortest wavelength of 10G DS band and required guard band

Study results on the required guard band (GB) from system vendors;

  • 35 dB-Isolation and 40 nm-GB would be necessary for PLC-type module.

  • 15~20 nm-GB would be feasible for BIDI-type module. (There is a report that 5 nm-GB would be theoretically feasible.)

  • For BOSA-type module, the insertion loss would be less than 1 dB when the signal wavelength is assigned between 1574 and 1580nm.

  • 20 nm-GB is now available for TO-CAN module.

It is considered that 16 nm-GB for 1574 nm channel is feasible.

Longest wavelength of 10G DS band

The longest wavelength is referred to ITU-T recommendations such as G.982 and G.983, in which the signal wavelength range shall be less than 1580 nm.

Isolation: 35dB

Signal band : 6 nm

Video

10G-PON (DS)

l

1550

1560

1574

1580

Guard band: 16 nm


Wavelength plan proposal intermediate report

Summary

Configuration of optical filters in ONUs

: WDM filter + BPF

10G-PON

(DS)

1G&10G-PON (US)

GE-PON

(DS)

Video

Band-pass filter for extracting

only downstream signal

l

1.55

1.48

1.56

1.26

1.50

1.36

WDM filter for splitting and combining up- and downstream signals

Wavelength allocation and BPF specification

The shortest wavelength is bound by the characteristics of the optical BFP.

The longest wavelength is bound by conventional ITU-T recommendations such as G.982 and 983, in which the signal wavelength range shall not exceed 1580 nm.

Isolation:

35 dB

Signal band:

6 nm

Video

10G-PON

(DS)

l

1560

1580

1550

1574

Guard band: 16 nm


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