Wavelength Plan Proposal - Intermediate Report -

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 only one 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
1.61
1.66
1.21
1.26
1.36
1.41
1.46
1.51
1.56
1.31
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, and in
general these are mainly categorized into the
following two cases (Case-1) combination of
several WDM filters, as shown in
3av_0703_hajduczenia_2.pdf, (Case-2)
combination of WDM filters and optical bandpass
filters.
(Case-1)
(Case-2)
SWPF1
SWPF2
SWPF
LD
LD
LWPF
BPF
12601360 1G/10G Up
14801500 1G Down
15501560 Video
15741580 10G Down
PD
PD
16251650 OTDR
Filter name Pass l band nm Min. guard band nm Filter angle deg
SWPF -1360 120 45
BPF 1574-1580 14 0
Filter name Pass l band nm Min. guard band nm Filter angle deg
SWPF1 -1360 120 45
SWPF2 -1580 45 0
LWPF 1574- 14 0
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)
1G10G-PON (US)
GE-PON (DS)
1G10G-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
1.50
1.56
1.48
1.50
1.56
SWPF-1
SWPF-1
Transmitter side
Transmitter side
Pass band
Pass band
10G-PON (DS)
10G-PON (DS)
1G10G-PON (US)
GE-PON (DS)
1G10G-PON (US)
GE-PON (DS)
Video
Video
SWPF-1
1.26
1.36
1.26
1.36
l
l
1.55
1.55
1.48
1.50
1.56
1.48
1.50
1.56
The cost of the ONU would be mainly dominated by
the optical transceiver components, and therefore
the insertion loss property should be the most
important factor in designing the filter to
alleviate the optical transceiver specifications.
From this perspective, first, the feasibility
of the case-2 filter was considered because the
smaller number of filters is preferable in terms
of the insertion loss.
5
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 lt 1dB, (c)
Isolation_at_1560nm gt 35 dB, (d) No
restriction on the module type, (e) ONU
embedded filter (preferable).
Isolation 35dB
Signal band
Video
10G-PON (DS)
l
1560
1550
What is required guard band?
On the above conditions, 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) are
reported from system vendors

• 35dB-Isolation and 40nm-GB would be necessary for
  PLC-type module.
• 1520nm-GB would be feasible for BIDI-type
  module. (There is a report that 5nm-GB would be
  theoretically feasible.)
• For BOSA-type module, the insertion loss would be
  less than 1dB when the signal wavelength is
  assigned between 1574 and 1580nm.
• 20nm-GB is now available for TO-CAN module.

It is considered that 16nm-GB, the shortest l of
1574nm, would be possible.
Longest wavelength of 10G DS band
The longest wavelength is referred to ITU-T
recommendations such as G.982 and 983, in which
the signal wavelength range shall be less than
1580nm.
Isolation 35dB
Signal band 6nm
Video
10G-PON (DS)
l
1550
1560
1580
1574
Guard band 16nm
7
Summary
Configuration of optical filters in ONUs
WDM filter BPF
10G-PON (DS)
1G10G-PON (US)
GE-PON (DS)
Video
Bandpass filter for extracting only downstream
signal
l
1.55
1.26
1.36
1.48
1.50
1.56
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 be less than
1580nm.
Isolation 35dB
Signal band 6nm
Video
10G-PON (DS)
l
1560
1550
1580
1574
Guard band 16nm