1. Wavelength Plan Proposal - Intermediate Report -
ver. 1.1

2. 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
WDM filter problem of US/DS separation
Candidate for 10GE-PON : L-band
GE-PON (US)
GE-PON (DS)
Video
OTDR
SMF cut-off problem
1.21
1.26
1.31
1.36
1.41
1.46
1.51
1.56
1.61
1.66 l
Additional filters may be required to 1G-ONU and V-ONU.
Action Item
Wavelength Plan Proposal

3. 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 PD
1574～ G Down PD
1625～1650 OTDR
Filter name
Pass l band [nm]
Min. guard band
[nm]
Filter angle [deg]
SWPF1
-1360
120 45
SWPF2
-1580
LWPF
1574- 14
Filter name
Pass l band
[nm]
Min. guard band
Filter angle
[deg]
SWPF
-1360
120 45
BPF 14

4. 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)
Video
1G&10G-PON (US)
GE-PON
(DS)
Video
SWPF-1
BPF
LWPF-1
1.26
1.36
1.48
1.50
1.55
1.56 l
1.26
1.36
1.48
1.50
1.55
1.56 l
SWPF-1
SWPF-1
Transmitter side
Transmitter side
Pass band
Pass band
SWPF-1
SWPF-1
10G-PON
(DS)
10G-PON
(DS)
1G&10G-PON (US)
GE-PON
(DS)
Video
1G&10G-PON (US)
GE-PON
(DS)
Video
SWPF-1
1.26
1.36
1.48
1.50
1.55
1.56 l
1.26
1.36
1.48
1.50
1.55
1.56 l
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.

5. What is the required guard band size ?
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) 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
1550
1560
What is the required guard band size ?
System vendors investigated the required guard band for blocking video signal.

6. 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

7. 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
1.26
1.36
1.48
1.50
1.55
1.56 l
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)
1550
1560
1574
1580 l
Guard band: 16 nm