[en] A planar multipole wiggler device which can produce both linearly and circularly polarized synchrotron radiation is proposed. Standard wiggler designs have a quasi sinusoidal magnetic field distribution resulting in a - more or less - perfect cancellation of right/left handed circularly polarized photons emitted from successive poles. We show here that one can easily generate a periodic but asymmetric magnetic field distribution having a field integral still equal to zero in order to maintain a straight overall direction of the particle trajectory. Due to the asymmetry of the field distribution in our device, the synchrotron radiation along the wiggler axis can keep a high degree of circular polarization above or below the particle trajectory plane. As compared to standard bending magnets, the proposed device can afford a significant increase of the available flux of circularly polarized light which is typically proportional to the number of magnetic periods. As compared now to the two crossed field undulator system, our wiggler device definitively offers a much broader spectral range of emission and far more flexibility regarding energy scanned experiments which might prove to be very difficult with two crossed field undulator device. The wiggler described here should also accommodate any future or already existing machine with common lattices while a two crossed field undulator system is only to work on very low emittance storage rings. (orig.)