Low-loss planar lightwave circuit OADM with high isolation and no polarization dependence

Albert, Jacques; Bilodeau, François; Johnson, D. C.; Hill, K. O.; Hattori, Kyota; Kitagawa, Takeshi; Hibino, Y.; Abe, Makoto

doi:10.1109/68.748230

Cited by 33 publications

(4 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interferometric OADMs rely on the interference between two optical signals reflected by Bragg gratings that are incorporated into various interferometric optical arrangements, such as Mach-Zehnder interferometers (MZIs) [2]- [7] and symmetric, full (100%) couplers (SFCs) [8]- [10]. A perfectly matched MZI-based OADMs, with identical gratings in each arm, can potentially result in an ideal performance, better than the one of OC-based OADMs, since they show no backreflections and need no extra components, i.e., circulators or isolators.…”

Section: Introductionmentioning

confidence: 99%

Design considerations in optical add/drop multiplexers based on grating-assisted null couplers

Riziotis

Zervas

2001

J. Lightwave Technol.

View full text Add to dashboard Cite

Abstract-The performance of a fully optimized optical add/drop multiplexer (OADM), based on null couplers and tilted Bragg gratings, is studied in detail. It is shown that maximization of the device performance involves three main optimization steps. First, the waveguide asymmetry ( 2 1 ratio) should be optimized in order to minimize the extinction ratio of the unwanted mode at the null coupler waist. Second, the coupler taper shape should be optimized in order to further minimize the aforementioned extinction ratio. Third, the grating tilt angle and relative width can be also optimized to give negligible backreflections at the input port and minimize radiation losses. The results show that the proposed high-performance OADM configuration can meet the stringent telecom specifications.

show abstract

Section: Introductionmentioning

confidence: 99%

Design considerations in optical add/drop multiplexers based on grating-assisted null couplers

Riziotis

Zervas

2001

J. Lightwave Technol.

View full text Add to dashboard Cite

show abstract

“…A comparison of this device performance with other MZI OADMs reported on the literature is given on Table I. In [20] and [21], two MZI OADMs are fabricated with standard lithographic techniques together with UV writing, while in [22] an ion exchange with an overlay grating is used. The device reported here exhibited a lower than most intra-channel crosstalk of −30 dB, with a much lower 3 dB bandwidth of 0.19 ± 0.01 nm, a similar extinction ratio of 14 dB without phase trimming, and a higher insertion loss of 3.7 dB and 4.9 dB for the drop and through port respectively (using TE polarized light), as a result of a 5.4 cm long device.…”

Section: Add-drop Multiplexersmentioning

confidence: 99%

Monolithic Add–Drop Multiplexers in Fused Silica Fabricated by Femtosecond Laser Direct Writing

Amorim

Maia

Alexandre

et al. 2017

J. Lightwave Technol.

View full text Add to dashboard Cite

The fabrication of optical add-drop multiplexers in fused silica is demonstrated, for the first time to our knowledge, using the femtosecond laser direct writing technique. To achieve this, a Mach-Zehnder interferometer configuration was used for the signal routing by the implementation of 3-dB directional couplers, along with Bragg grating waveguides for wavelength selectivity. The fabrication of all individual devices required was optimized. The behavior of the fabricated add-drop multiplexer was characterized at around 1550 nm, where a 3-dB bandwidth of 0.19 ± 0.01 nm was obtained along with an intrachannel and adjacent interchannel crosstalk of -30 and -20 dB at Δλ = ± 0.75 nm, respectively. This study shows that such complex devices can be manufactured by femtosecond laser direct writing, with future improvements being discussed.Index Terms-Add-drop multiplexer, femtosecond laser, integrated optics, laser materials-processing applications, optical device fabrication, wavelength division multiplexing.

show abstract

“…It increases the size of the device and the cost. To extract the filtered signal into another output port, multimode interference coupler or a directional coupler was incorporated along with Bragg reflectors [12,13,17]. However, because of strict fabrication tolerance, experimental demonstration of such a device with good performance has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

Tunable channel-drop filters consisting of polymeric Bragg reflectors and a mode sorting asymmetric X-junction

et al. 2015

View full text Add to dashboard Cite

A tunable channel-drop filter as essential component for the wavelength-division-multiplexing optical communication system has been demonstrated, which is based on polymer waveguide Bragg reflectors. For an ordinary Bragg reflector, the filtered signal is reflected toward the input waveguide. Thus an external circulator is required to separate the filtered signal from the input port, though it increases the total footprint and cost. For this purpose, we employed dual Bragg reflectors and a mode sorting asymmetric X-junction. The Bragg reflector exhibited a maximum reflectivity of 94% for a 6-mm long grating, a 3-dB bandwidth of 0.39 nm and a 20-dB bandwidth of 2.6 nm. The mode sorting crosstalk in asymmetric X-junction was less than -20 dB, and linear wavelength tuning was achieved over 10 nm at the applied thermal power of 377 mW.

show abstract

Low-loss planar lightwave circuit OADM with high isolation and no polarization dependence

Cited by 33 publications

References 11 publications

Design considerations in optical add/drop multiplexers based on grating-assisted null couplers

Design considerations in optical add/drop multiplexers based on grating-assisted null couplers

Monolithic Add–Drop Multiplexers in Fused Silica Fabricated by Femtosecond Laser Direct Writing

Tunable channel-drop filters consisting of polymeric Bragg reflectors and a mode sorting asymmetric X-junction

Contact Info

Product

Resources

About