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WF6-1 I 97
A New Concept for the WDM Module using
a Waveguide equipped with Filter
M.Ukechi, T.Miyashita, Y.Komine, T.Mase, A.Takahashi, T.Nishimura,
R.Kaku, S.Hirayama, N.Uehara, K.Ito
Central Research Laboratory, Japan Aviation Electronics Industry, Limited
1-1, Musashino 3-chome, Akishima-shi, Tokyo, 196-8555 JAPAN
TEL.+81-42-549-9215 F M . +81-42-549-9572 E-mail ukechimaae. co.jp
1. Introduction
A low-cost WDM module is a key component for optical access networks (ATM-PON etc.), and a hybrid
integrated optical module consists of a dielectric multilayer filter and an optical waveguide is one of the
promising configuration[ 11. However, the assembly process of a film filter and an optical waveguide has
some problems. Especially, from the viewpoint of the cost, the difficulty of the assembly process is
serious problem. In this paper, we propose a cost-effective new concept for the WDM module using a
polymer (fluorinated polyimide[2,3]) optical waveguide equipped with filter.
2. Directly deposited WDM Filter onto the Wavegudes
Fig. 1 . shows a conventional configuration o f a WDM device consists of a dielectric multilayer film filter
and a slotted waveguide. However, this configuration has three problems[4].
(1) Difficulty of the insertion process of a film filter
(2) Existence of a film substrate for a filter
(3) Existence of adhesive
The problem (1) cause the high cost of assembly process of WDM devices. The problem (2) and (3)
worsen the insertion loss and the stability of optical characteristics. Therefore, we made experiments of
directly deposition onto the end face of fluorinated polyimide waveguides. Fig. 2. shows the directly
deposited WDM filter onto the end face of the V-shape waveguide. This WDM filter is Ta20s/Si02
dielectric multilayer deposited by ion beam sputtering process[5]. This waveguide equipped with filter
acts on the wavelength separation device. There is no adhesive and film substrate. Of course, the
insertion process of a film filter is unnecessary.
WDM Film filter
\.
Adhesive
I
V
I
Optical waveguide
'Optical waveguide
WDM filter
Slit
Fig. 1. Conventional configuration
Fig. 2. Waveguide equipped with filter
98 I WF6-2
Fig. 3. and Fig. 4. show reflectance and transmittance dependency on wavelength of this waveguide
equipped with WDM filter. These datum include the insertion loss of the fluorinated polyimide
waveguide (0.4OdBIcm at 1.3 1 1.1 m, 0.5 1 dB/cm at 1.55 ,U in [4]) and two coupling losses of the single
mode fiber with the waveguide (0.4dBhurface [4])
~l , , , , , , , , , ~ , , , , l , , , , , , , , , l
1.2
1.3
1.4
1.5
1.6
1.7
Wavelength( p m)
Fig. 3. Reflectance dependency on wavelength
I , , > , , , , . ,
1.2
1.3
1.4
1.5
1.6
1.7
Wavelength( p m)
Fig. 4. Transmittance dependency on wavelength
3. The WDM Module using a Waveguide equipped with Filter
Fig. 5. shows a new concept for the WDM module (for ATM-PON) using a waveguide equipped with
filter. All optical devices (LD/PD/Waveguide equipping filter) are mounted on the silicon V-groove
substrate by FCB (Flip Chip Bonding) . The FCB; and the silicon V-groove technique are capable for
below 1 1.1 m precision alignment. Then, this configuration (Fig. 5 . ) achieves the all passive alignment
process. Fig. 6. shows a sample of this WDM chip(a waveguide equipped with filter is mounted on a
Silicon V-groove substrate). The size of this waveguide equipped with filter is 2.8cm long and 3.0cm
wide. This new concept will decrease the assembly process cost and the size of WDM modules.
Waveguide equipped with filter
substrate
Fig. 5 All passive alignment WDM chip (for ATM-PON)
WF6-3 / 99
Fig. 6. Photograph of WDM chip
4. Conclusion
We have proposed the new concept for the WDM module using the wavegude equipped with filter.
Directly deposited filter onto the waveguides have great potential for cost down of WDM devices. This
configuration will contribute to realize cost-effective ONUS for ATM-PON or any other optical access
networks.
References
M.Ukechi et al. -'The WDM Module (for ONU) using Polymer Optical Waveguides" , Proc. of the 1998 IEICE General
Conf., C-3-186 (1998)
T.Matsuura et al. "Heat-resistant Singlemode Optical Waveguide using Fluorinated Polyimides' Electron. Lett. , Vo1.29
No.24, p2107 (1993)
M.Ukechi et al. "Development of Polyimide Optical Waveguides" Technical Report of IElCE , EMD98-9 , p19 (1998)
M.Ukechi et al. "The WDM Module (for ATM-PON) using Fluorinated Polyimide Optical Waveguides'' Proc. of Int. POF
Conf. PJ5 (1999)
K.Ito et al. "Dielectric Multilayer Thin Film Fabrication Process and the Application for Optcal Telecommunication"
Technical Report of IEICE , EMD99-6 , p7( 1999)
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